Centrifugal Blower Fan – Canada Fans Industrial Blowers & Fans

Industrial Fans & Noise

The important factor to consider is the fan’s blade pass frequency, which is a pure tone produced when the blades of the fan wheel (impeller) rotate past the housing cut-off sheet in centrifugal fans, or the turning vanes, in axial fans. The blade pass frequency is calculated by multiplying the number of blades times the rotating speed in revolutions per minute. If this frequency matches the natural frequency of the ductwork, it can excite the ductwork, which can cause it to resonate, thereby increasing the noise level. Because of this possible increase in sound, and because certain pure tones are irritating to people, the sound output of the blade pass frequency should be investigated when sound reduction is desired. The next factor to consider is the fan design. Generally a fan operating at peak mechanical efficiency will produce less noise, because high efficiencies result from minimal air turbulence within the fan.

The sound generated by some fans can be a potential hazard to personnel in close proximity to the fan, and the sound can be transmitted, via the ductwork connected to the fan, to all areas serviced by the fan. Because of these concerns, fan manufacturers publish sound ratings for their products to serve as a guide for selecting fans to meet sound specifications, and to assist acoustical consultants in predicting the total noise levels in specific environments. This article provides basic information to help understand fan sound ratings and how to apply them. Like any mechanical device, fans generate sound, which emanates naturally from the turbulence of moving air, the mechanics of moving parts of the fan, and from vibration.

Air turbulence within the fan increases the sound coming from the air movement. The noise resulting from air turbulence is a major factor in the sound levels of a fan in a specific application. Further, duct work can transmit this turbulent noise to all areas serviced by the fan. Factors contributing to air turbulence include the resistance to flow, flow separation along fan surfaces, and shock related to abrupt changes in the direction of airflow, pressure, or velocity. A lower noise level can be achieved by reducing air turbulence. This can be done by considering several factors related to air movement when selecting fans.

Industrial Centrifugal Fans Design

There are four basic centrifugal fan wheel designs – forward curved, backwardly inclined, radial, and radial tip – and a variety of axial flow wheel designs. Each wheel design has unique sound characteristics due to the way they handle air, and the efficiencies they can achieve. Fan speed does not always determine which fan will be quieter. For example, centrifugal fans have higher amplitudes at lower frequencies, while axial fans exhibit higher amplitudes at the higher frequencies. The amplitude of the blade pass frequency on an axial fan is higher and more pronounced than on backwardly-inclined fans, and commonly will have amplitude peaks at multiples of this frequency.

Backward Inclined Fans

Of the four centrifugal designs, the backwardly inclined fans are the most efficient, and therefore, the quietest. Those with airfoil-shaped blades offer the highest efficiencies, for clean air environments, while those with single-thickness blades can be used in applications where light dust or moisture is present, although the efficiencies are somewhat lower.

Axial & Vaneaxial Industrial Fans

Certain types of axial fans offer the next highest efficiencies. An excellent example is the Vaneaxial fan that uses airfoil shaped blades in an in-line flow design. This fan is used to handle high volumes of clean air at low pressures, which is a typical ventilation application.

Radial Blade Fans

Radial fans are typically low efficiency, open designs for special purpose applications, such as bulk material handling, or exhausting / supplying lower volumes of air at higher pressures. A radial fan will be much louder than a backwardly-inclined fan operating under the same volume and pressure conditions.

Radial Tip Fans

Radial Tip fans, commonly used to handle larger volumes of air that contains particles or material, exhibit sound characteristics similar to the radial fans. The sound spectra of radial and radial tip fans contain amplitude spikes at various frequencies, and a noticeable spike at the blade pass frequency.

Forward Curve Fans

The forward-curved fan design operates at speeds that are much slower than the other fan types, which results in lower noise levels from mechanical operation and vibration. However, because of its modest efficiencies, a forward curved fan may be noisier than a backwardly-inclined fan when operating at comparable volume and pressure. The sound spectrum of the forward-curved fan shows a slower rate of reduction in amplitudes than the other centrifugal types, and because of the large number of blades, the blade pass frequency occurs much later in the spectrum and is not predominant.

Industrial Fan Components

The moving components of the fan – the motor, bearings, and drive – produce sound. This too can be transmitted through the system via the fan structure or shaft, or when these components are in the airstream. Motor sound will vary with speed, enclosure, electrical characteristics, and even the manufacturer. Antifriction bearings can be used to reduce bearing noise, and proper drive selection will reduce the likelihood of belt hop, or slap. Of course, proper maintenance must be employed to keep the moving parts running smoothly, and quietly.

Excessive vibration can significantly add to the overall noise level of an installation. This will occur if the fan or any of its components are not adequately balanced, if the fan is installed on an insufficient foundation, or if the fan is not properly isolated from other system components. For example, it is not uncommon for the fan’s support structure or ductwork to have a natural frequency at the fan’s operating speed or blade pass frequency, either of which can cause the system to resonate at that frequency, increasing the sound levels, and the possibility of damaging the installation. These risks can be eliminated by changing the speed of the fan, installing appropriate isolation, and / or detuning of the fan or affected system components.

dBA is a useful measurement for evaluating the overall noise level at a particular location, but this measurement takes into account all of the sound sources affecting that particular location, which include the sounds from all equipment in the area, natural sounds of the environment, and from other environmental factors. Some of these factors are the current physical properties of the air such as temperature, humidity, and pressure, whether the location is outside or inside, the size and material of the room. All of these affect the sound pressure experienced by the listener, and recorded by the sound level meter.

Published fan sound power ratings and corrections only reflect noise created by air turbulence within the fan. Because of the infinite variables, mechanical noise and vibration noise are impossible to accurately predict, and are not included in the rating.

Additional information can be found at the Northern Fan web site http://northernindustrialsupplycompany.com/products/ventilators.html

Oleg Cthetchel
Air Process Systems Engineer
nis@primus.ca
Northern Fan Co.
http://northernindustrialsupplycompany.com
http://northernindustrialsupplycompany.com/burlington/request6.html

Fans and Blowers Noise Levels

nis@primus.ca

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Industrial Fans Manufacturer & Supplier

Canada Fan sales offices are located throughout North America and manufactured around the world. Wherever you are, “We want you to enjoy doing business with us.” Leave it to Buffalo Fan to take a perfectly reliable fan and offer a quieter, more efficient, less costly alternative. Canada Fan Corporation is committed to offering a wide variety of fans to meet your needs. Please visit our link, below, to view our capabilites and vast selection of designs.

Typical Industrial Fan Applications

Typical applications include air cleaning systems, mechanical draft, chemical processes, kiln exhaust, mine ventilation, gas recirculation, sinteric and cryogenic service.

Canada Fan / Canada heavy duty axial and centrifugal fans are designed to handle applications involving erosive and corrosive gases, large capacities, high pressures and temperature extremes.

To meet these operating conditions, Canada Fan / Canada heavy duty fans are designed and selected with the use of modern computer techniques guided by over 100 years of fan engineering experience. Comprehensive testing confirms design decisions. Quality manufacturing standards guarantee long service life.

Industrial Fans & Blowers Excellence

Over the years, Canada Fan / Canada supplied fans, blowers and pumps to a wide range of industries and applications. When prolonged service wears fan wheel the logical replacement is a new fan wheel built to the original design. A technical support and sales agent will get a replacement wheel, shaft, bearings, accessories, etc. in the shortest time. She, or he may also recommend changes to extend service life and performance of your machinery, including special materials of construction, explosion-proof and spark-resistant design, variety of coatings and accessories, intended to meet practically any application needs.

Best Industrial Fans & Blowers Performance

Canada Fan air moving products are best know for “industrial quality” assuring reliable performance, relentless dependability and longevity. A staff of specially trained engineers will design a dependable fan that exactly fits customers’ dimensional and performance requirements.

Solving difficult and unique air moving problems has earned Buffalo Fan a reputation for exceptional performance and reliability. Whether it’s energy related or industrial processing or simply moving a precise volume of air, a staff of specially trained engineers will design a dependable fan that exactly fits your performance and dimensional requirements.

Canada Fans are sold and serviced by air movement professionals. We can help you explore your needs and will be pleased to work with you.

Additional information can be found at the Northern Industrial web site http://northernindustrialsupplycompany.com/products/ventilators.html

Oleg Cthetchel
Air Process Systems Engineer
canablower@cogeco.net
Canada Fan Co.
http://northernindustrialsupplycompany.com
http://northernindustrialsupplycompany.com/burlington/request6.html

Canada Fan / Canada

airknife@cogeco.ca

Oleg Tchetchel

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chicagoblower

chicagoblowerc

fan@cogeco

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Industrial Fans – Chemical Industry

Biomass boiler packages service the wood industry—burning waste products ranging from excess wood, wood chips, coconut husks, or even cocoa bean shells to create steam that can then be used to generate power. Fans serving these types of industrial applications need to have a rugged construction to be able to handle the harsh operating environment introduced by the high-temperature biomass boilers, and Canada Fans fans continue to stand up to the test. All housings are continuously welded using heavy gauge, reinforced steel, and suitably braced to prevent pulsation. Wheels and blades are manufactured with a heavy-duty, robust design.

Radial Blade Fans

In addition, the range of products used in the boilers means that the fans must handle often-dirty airstreams. In these cases, straight radial blade designs are used to alleviate the potential operational problems that can be caused from buildup on the blades from materials coming through the fan. Canada Blower also understand the importance of designing a product that could meet the needs of varying climates and other environmental challenges. Canada Fans fans are designed to be prolific throughout the word, from varying climates in South America, Europe, Canada, and all throughout the U.S. to ensure uninterrupted, consistent operation.

Canada Fans has the engineering and manufacturing capabilities to accommodate virtually every conceivable application,after completing thousands of successful installations worldwide and have a proven track record for tackling the most technically complex and unique applications. Buffalo Fan offers a great breadth of products and quickly adapting to the needs of the customers.

The petrochemical industry utilizes fans in many different areas of the plant. Each of these custom applications requires quality fans designed for durability, ease of maintenance and dependability. Some of the areas where fans are used include forced draft fans and induced draft fans. Canada Fans has extensive experience providing air movement solutions involving all areas of petrochemical processing, and has worked with numerous companies throughout the United States and worldwide, serving more than 60 petrochemical facilities and counting.

Canada Fans provides fan testing and validation services at the in-house laboratory, as well as on-site. We also offer scheduled maintenance, including balance, alignment and operational training. Canada Fans services and repairs all brands and types of fans. The fan services offered is an extension of Canada Fans’ commitment to provide the customers with the highest level of service and support.

Canada Fans and its assotiated companies have vast experience in meeting the extremely stringent requirements of the American Petroleum Institute (API). With engineers sitting on the API task force, project management, test procedures and worldwide installations, Canada Fans has the experience and expertise to meet the API 560 and 673 specifications without exceptions. Typical requirements are:

• Fan sleeve bearings, wither anti-friction or hydrodynamic
• Constant level oilers
• Single or double carbon ring shaft seals
• Corrosion resistant shaft sleeves with strict runout tolerances
• Heavy-duty inlet silencers with minimum 15′ height requirements
• NDE-Dye penetrant inspection of rotor welds
• Fan mechanical run test & performance shop test

Special features of chemical duty fans are:

• Cast iron access doors
• External linkage radial vane damper
• Tubular base
• Lateral & torsional analysis complete to the bottom of the sub base

Canada Fans is an industry leading designer and manufacturer of the highest quality industrial fans throughout the world. Our products are known for their rugged construction and reliable operation. Canada Blower offers unmatched flexibility and fan customization, coupled with superior service before and after the sale. Canada Blower also have the capability to provide parts and service for products not manufactured by Canada Blower Co.

For additional information please refer to http://www.canadafans.com

Susan Terlitski
Designer of Industrial Process Ventilation Equipment
canadablower@canadablower.com
Canada Blower
http://www.canadablower.com/inquiry/index.html
http://www.canadablower.com/fans/index.html

Fan / Blower for Chemical Industry

canadablower@canadablower.com

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buffaloblowercom

***

Industrial Blower Fan Types

Different models of fans are available in the market in various unique designs, integrated with the latest technologies and low power consumption facilities. The variety of elegant fans includes integrated gear box and push button switch to suit any decor.Many stylish fans with double ball bearing are available in lots of colors which are integrated with dynamically balanced blade for maximum air delivery.The use of radial blower in the fans helps in moving air perpendicular to the blower axis and provides relatively low flow rates and high pressures.

Wide range of blowers and fans

The wide range of blowers and fans includes non-decorative Ceiling fans, wall mount fans, decorative ceiling fans, single centrifugal blowers, dual centrifugal blowers, radial wheel blowers, cast aluminum blowers, high pressure blowers, belt driven blowers, explosion proof and food safe blowers, high temperature oven circulating fans, industrial fans and also stainless steel and other alloy fans are available in the market. Finest quality, durability and enduring performances of these fans are catching more attention of the market these days. A wide range of axial flow fans is designed to provide efficient trouble free service & reduce the initial and operating cost to minimum. Apart from the fans there are various other products like air blowers, air scrubbers, axial fans, axial flow fans, centrifugal blowers, cyclone seperators, dust collecting equipment, dust collector, exhaust blowers, fan blowers, industrial blowers and many more.

Non-Decorative Ceiling Fans are integrated with the low power consumption facility with double ball bearing for maximum air delivery and available at very reasonable price. Non-Decorative Ceiling Fans are high speed fans, which are available with four blades to provide maximum air delivery and best for all small rooms. Non-Decorative Ceiling Fans has variety of designs and colors available at the best competitive prices. Non-Decorative Ceiling Fans consists of power saving technologies which make it more unique and high monopoly holder in the competitive market.

Wall Mounted Fans

Wall Mount Fans are available in sleek and stylish look with less noise and delivers maximum air pressure. Wall Mount Fans are integrated with aluminium blade coated which increases its life and also gives an elegant look to your room. Wall Mount Fans are available in many colors like Blue, Red, Brown, Cherry and lots more.

Decorative Ceiling Fans are one of the most demanding ranges of fans in the market. The aluminium body with golden touch offers a unique look and suits any decor. These days, the latest technology of power saving in fans attracts the market and consumers as well.

Susanna Terlitskaia
Industrial Ventilating Engineer
Industrial Blower Fans Company
nis@primus.ca
canadafans.com

Fan Types

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nis@primus.ca

Industrial blowers

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http://www.nisco.net/tchetchel.gif

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Ventilator Fans – Methods of Building Ventilation

When straightforward breeze conditioning system is possible, the rate of air velocity method outlined above should be the basic method used. However, there may be rooms or areas within the building that will require special treatment. If so, one of the other methods, such as spot cooling or zone cooling, may be combined with the basic method to achieve the over-all objectives.

Air circulators

Air circulators may be effectively used to boost air velocity through large buildings that have a flow pattern difficult to control. Air circulators are also used to redirect air into occupied areas near floor level. Air circulators are also effectively used in locations where adequate exhaust and supply air fans may be lacking. Air circulation alone may provide heat relief and cooling comfort to individuals in the area. Northern Fan’s Type CABL fan is ideally suited to this application. For many installations, fans like this may be positioned 8′ to 10′ above the floor and at approximately 50′ intervals to obtain a continuously circulating column of air across a room or building. To broaden the column of air, fans should be located abreast of each other 15′ to 20′ apart. Fan locations and positions are easily adjusted to the requirements of the area.

Although an accurate, intelligent calculation of the required air volume for a breeze conditioning system has been made, there are practical limitations in most buildings that may seriously affect the final results. By giving these limitations proper consideration in the planning stage, the system can usually be modified to compensate for them. Some of the more common limitations are listed here.

Air Flow Restrictions due to interior partitions

It is obvious that interior partitions restrict and interrupt the flow of air through a structure. The effect of these partitions on the system must be analyzed and solutions found. In buildings with very high ceilings. the cross-sectional area factor may become unrealistic in calculating the required air volume. In most instances, inexpensive baffles can be installed across the building width to reduce the effective cross-section to an area 10′ or 12′ above floor level. Machinery, raw materials and finished goods that obstruct air circulation. These obstacles, like interior partitions, must be considered and methods worked out to overcome the problems they create to the proper circulation of air through the structure. Frequently, the location of heat-producing machinery will seriously interfere with the preferred pattern of air circulation. This situation can destroy the effectiveness of the system. An alternative plan to overcome the problem is essential.

Another limitation of the very high ceiling or roof is the difficulty of maintaining the air velocity near floor level. The baffle method just described is usually the best way to reconcentrate the air flow along the floor level where it will be effective in providing personnel comfort. In large buildings, baffles may be required at l00-foot intervals to keep air flow near the floor level.

Operations within the area frequently require wall openings or loading doors that will drastically interfere with the desired airflow pattern. In some cases, individuals may open windows that should remain closed to maintain effective air circulation. A remedy for each of these problems is required. For maximum efficiency and economy, a good layout will avoid the restricted intake opening. The type of exhaust equipment normally utilized is most economical and efficient if static pressure in the system is 1/8″ or less. To obtain this condition, air velocity through intake openings should not exceed 1,000 feet per minute, a lower figure is usually desirable.

Additional information can be found at the Northern Fan web site http://northernindustrialsupplycompany.com/products/ilg.html

Oleg Cthetchel
Canadian Industrial Ventilating Engineer
airknife@cogeco.ca
Northern Fan Co.
http://northernindustrialsupplycompany.com/manufacturers.html
http://northernindustrialsupplycompany.com

Practical Way of Ventilation

airknife@cogeco.ca

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canadablower

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Exhaust Fans

The practical designs of modern homes are more focused on energy conservation. Making a home practically air-tight reduces heating requirements thus saving on electricity costs. This may be a great way to save money and help the environment, but it also leads to poor air circulation inside the house. Poor air quality can lead to a variety of cardiovascular diseases, ruined paint and damaged furniture which is why it is important to have good air circulation inside the home. The best way to do this is to install ventilation exhaust fans.

Types of Exhaust Fans

There are many different types of exhaust systems and getting an idea of how each one works will give you an idea of what type will be the best for your home. Different sized homes will have different ventilation requirements. Larger homes will require a variety of ventilation fans to keep the air from getting stale.

Wall Mounted Exhaust Fan Systems

The most common types of ventilation air purifying fans are wall mounted, ceiling mounted, inline fans, combination, exterior remote mounted and kitchen range exhaust fans. It is best to have ducting installed in areas where a visible fan would not blend in well. Areas like the living room, dining room, den and bedrooms would be good places to have ducting installed. Stale air runs through the ducting and exits the house via an exterior fan that expels the air outside, or busing using inline fans that are contained inside the actual ducting.

Ceiling or Wall Mounted Exhaust Fans

Kitchens, attics, laundry areas, bathrooms, garage and storage areas can be installed with either ceiling mounted or wall mounted exhaust fans if the area is situated beside an exterior wall.

It is important that all the areas inside a home need to have air circulation so that pollutants, pathogens or even humidity does not accumulate and lead to costly repairs or health problems. Be sure to select ventilation exhaust fans that are suitable for each area of the home.

For more information about proper building ventilation please visit the ABB Blower company web site http://www.fanblower.com/motor_cooling_fan.htm

Susann Terlitski
Designer of Industrial Air Handling Units
Fan and Blower Co.
abbblower@abbblower.com
http://www.fanblower.com/axial_flow_fan.htm
http://www.fanblower.com/inline_fan.htm

Exhaust Fans

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abbblower@abbblower.com

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Industrial Exhaust Fans

Exhaust Fan Systems

Ventilator Fans

Wall & Roof Exhaust Fans

Kitchens, attics, laundry areas, bathrooms, garage and storage areas can be installed with either ceiling mounted or wall mounted exhaust fans if the area is situated beside an exterior wall.

Ventilator Exhaust Fans for the Home

For more information about proper building ventilation please visit the ABB Blower company web site http://www.fanblower.com/motor_cooling_fan.htm

Susann Terlitski
Designer of Industrial Air Handling Units
Fan and Blower Co.
abbblower@abbblower.com
http://www.fanblower.com/axial_flow_fan.htm
http://www.fanblower.com/inline_fan.htm

Exhaust Fans

air handling unit industrial airhandler AHU conditioner commercial ventilator fan blower building ventilation ventilating cooling heating circulation circulating roof top supply

abbblower@abbblower.com

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***

Industrial Fans & Blowers – Commercial & Industrial Uses

Canada Fans provides fans for every type of commercial structure including airports, arenas, stadiums, distribution centers, malls, offices, and retail. Canada Fans also offer smoke and heat exhaust fans that are UL listed for Smoke Control Systems and a full line of kitchen fans that are UL 762 listed for the exhaust of grease-laden air. Canada Fans engineers design, test, and manufacture fans for all types of buildings, including condos, custom homes, offices, malls, airports, arenas, and stadiums. We are able to meet your most precise requirements for a variety of HVAC equipment, including all types of custom, package air handlers and roof top units. In addition, Canada Fans can provide exhaust for restrooms, elevator shafts, parking garages, and jet bridges; stairwell pressurization; rooftop and sidewall supply and exhaust, including smoke and heat exhaust fans that are UL listed for Smoke Control Systems, as well as kitchen fans that are UL 762 listed for the exhaust of grease-laden air.

Exhaust Fans

Canada Fans supplies thousands of fans to universities, hospitals, laboratories and research facilities, military bases, hotels, convention centers, and cruise ships around the world; working closely with architects, engineers and contractors to design and test fans that can meet the most precise quality and reliability requirements. Canada Fans makes smoke and heat exhaust fans that are UL listed for Smoke Control Systems, kitchen fans that are UL 762 listed for the exhaust of grease-laden air, and a full line of laboratory and fume exhaust systems. Canada Fans provides fans for numerous residential building applications, such as stairwell and elevator shaft pressurization; kitchen, restroom, and pool exhaust; and every aspect of HVAC, including air handlers, gravity ventilators, and large rooftop units.

Blowers & Fans For Exhaust Ventilation

Manufacturing facilities require a large amount of ventilation to maintain a healthy work environment for the people working within the buildings. Canada Fans designs and builds fans to control and handle the exhaust, supply, and make-up air requirements for all types of manufacturing environments and spaces. The exhaust of welding and other noxious fumes and dusts, as well as the exhaust of hot air produced from ovens and other high temperature processes, are essential to providing safe and comfortable working conditions. In many cases, the building heating, cooling, and air conditioning (HVAC) requirements are also critical for proper production control and working conditions. A wide variety of businesses, industries, medical facilities, and institutions require ultra clean environments for research and development as well as production of specialty products and equipment. These facilities demand high filtration and positive pressures inside the clean room space to control the process and limit potential contamination. Other requirements typically include variable air volume, high efficient air moving equipment, low noise, and ultra-low vibration levels from the mechanical equipment.

Energy Efficient Fans & Blowers

Among many other changes, the green revolution has created a greater need for more energy efficient fans and ventilation equipment. As a leader in the fan industry, Canada Fans engineers and manufactures high efficient products for a wide variety of green friendly applications including LEED building designs, biofuel and biomass production plants, landfills, solar film manufacturing facilities, as well as numerous waste energy and heat recovery systems. Regardless of how unique or specialized your process is, Buffalo Blower can customize our products to meet virtually any requirement.

Large Industrial Fans & Axial Ventilators

Canada Fans is well known for leveraging its design and manufacturing capabilities when constructing the heavy duty fans required for marine applications. Such marine duty fans are used for many purposes including boiler combustion air, mechanical ventilation, off shore rig diesel generator exhaust disbursement, pressurization, engine cooling, and dust control. Our air moving equipment can be found on drilling rigs, production platforms, tug boats, cruise ships, ferries, and cargo ships. We offer a number of features to meet the specific needs of the marine industry. These include shortened axial fan housings for operating in tight spaces, cast aluminum impellers and hot dip galvanized steel components for extended durability, spark resistant construction for potentially explosive air streams, water tight electrical connections to withstand corrosive environments, and IEEE 45 marine duty motors for both above deck and below deck installations.

Blower Fan Standards

In addition to our extensive fan design and manufacturing experience, Canada Fans offer a number of products meeting requirements of the marine industry’s governing and standard organizations including:

• Air Movement and Control Association (AMCA) – Spark Resistant Construction
• American Bureau of Shipping (ABS) – Type Approval for Ventilation and Non-Sparking services

Additional information can be found at the Canada Fans company web site http://www.canadafans.com

Susan Terlitski
Canadian Process Air Systems Designer
canadablower@canadablower.com
Canada Fans
http://canadafans.com
http://canadafans.com

Commercial Ventilator and Fan

canadablower@canadablower.com

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buffaloblowercom

buffaloblo

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