Radial Blade Fan – Page 2 – Canada Fans Industrial Blowers & Fans

Blower Fan Ventilator – Air Make Up Fans

Lack of make-up air in a building can cause serious problems. Many times the problems are not even recognized and show themselves in ways that most people do not think about. A properly designed and installed ventilation system provides environmental control by avoiding negative pressure. Uncontrolled infiltration of air through window sashes, doors and walls leads to many undesired results. In this article we will discuss a few of these problems and inform you about the cost of make-up air.

The signs that You need Make-up Air Fans include:

1) Poor paint finishing due to dust, moisture or fumes. Exhaust fans will compete with each other for the available air. They are going to pull air from anywhere they can. Paint booth fans may lose out in the competition causing the paint to retain moisture and collect dust that is not removed by the exhaust fans.

2) Walls have moisture being pulled through. This shows that your plant is under negative pressure. Cement walls have small cracks that allow water to penetrate. Fans pull from every place air can get through. This includes walls. When fans pull air through walls, water from rain and other outdoor sources will also be pulled through. This will cause firring strips to rot, ruin wall coverings and paint jobs.

3) Smoke, haze and dust floating in the air. As you look across the factory is it hazy? You should be able to see clearly from one end of your factory to the other without the view being blocked by haze and smoke. If the area clears when a window or door is opened, it is starved for air. This indicates that the exhaust fans are competing for air. Welding, molding, metal cutting or many other processes can generate fumes that need to be exhausted or the factory could become hazy.

4) Stacks and exhaust fans take up a large portion of your roof. If this is the case, you are a prime candidate for make-up air. The number of stacks and exhaust fans on the roof is an easy way to gauge the amount of makeup air needed. The area of inlet air should be equal to or greater than the area of exhaust air. The hoods seem to have a downdraft rather than the normal updraft. The fumes from hoods are supposed to go up the hoods, but if the fan is starved for air the fumes will be found in the plant. This is also true for gas hot water heaters, boilers, furnaces and unit heaters or any other process that has a flue on it.

5) Fan motors also work harder when they are required. When a fan attempts to move air that is not there, it causes the load to rise. This causes the insulation to break down and shorten life. Motors should last 7 or more years. When every exhaust fan in the plant is fighting for the same air, all the motors are going to have decreased life.

6) When walking through the plant, odors seem to linger. Weld fumes, paint fumes and dip tanks all need to be exhausted. These fumes can cause undesirable mixtures of odors that linger and cause burning, watery eyes, sore throats or sinus trouble. This contributes to an Locker room, bathroom and other odors seem to creep through the plant and office. People’s clothes smell like the production line. Processes like oil mist, boilers, roasting ovens and paint booths have odors. All these aromas require ventilation. If the ventilators cannot provide the required number of air changes in the room, your plant is short of air.

7) Doors that are hard to open or doors that will not shut on their own are a sure sign that the plant is short of air. Inward swinging doors are easy to open and hard to close. Drafts through the door seals and knobs that are hard to turn add to the problem. Outward swinging doors are hard to open and “slam” shut, damaging seals and wearing hinges. Hydraulic door closer settings are set high to pull doors closed without slamming.

8) Shutters on the exhaust fans are not 100% open. Automatic or balanced shutters are not open. These shutters should be 100% open when the exhaust fans are running. If the exhaust fan is not getting enough air, the shutter will not open all the way. The shutters should gradually close when the fan is turned off. They should not slam shut.

9) Steel near the fume hoods is corroding due to fumes that should be exhausted. Many corrosive liquids require their own hood. Typically the hood is a stainless steel and will not deteriorate from the fumes. If the air is not going up the hood and fumes are being pulled through another exhaust fan that is not designed to handle the corrosive atmosphere, the fan and any nearby steel will also corrode and decrease the life of the unprotected equipment.

10) Cracks under the doors collect leaves, dirt or gum wrappers. The threshold of the door will collect a substantial amount of debris during the day due to the exhaust fans trying to grab air from anywhere they can get it. Part of grabbing the air will be the collection dirt and trash.

11) Cold walls. The walls should not be cold. The wall can act as an insulator if the air is balanced. Insulation will prevent some drafts, but no insulation will prevent all the air from coming through. With negative pressure, however, the drafts through the wall will be cold regardless of the amount of insulation. These cold drafts will cause absenteeism and help spread colds and illness throughout the building. People will constantly fight over the thermostat setting. Fuel will be conserved with proper ventilation. Without make-up air, cold conditions near the building perimeter and overheated areas in the middle of the building lead to installation of more inefficient unit heaters. These heaters work overtime to heat the air, which in turn gets pulled to center of the building thus adding to the overheating problem.

12) Pilot lights go out and the area smells of flue gases. The flue gases from the unit heaters must go up. When makeup air is needed, these gases do not go up the flue but back into the building. Unit heaters are not necessary with the proper makeup air units. The heat for the plant will come from the makeup air unit and the unit heaters will not run.

For additional information please refer to http://canadablower.com

Susan Terlitski
HVAC Ventilation Engineer
Canada Blower Co.
canadablower@canadablower.com
http://www.canadablower.com/air/index.html
http://www.canadablower.com/enclosures/index.html

Air Make Up Fan Ventilators

canadablower@canadablower.com

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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 Building Ventilation

Based on the objectives and funds available, one can now consider different alternatives for industrial building ventilation and select the best method to use in calculating air volume requirements. A description of these methods follows. This is a time-honored approach to a determination of air volume requirements. It is based on the theory that a complete change of air in a room or building should be made at a certain time frequency. The rate selected is frequently an arbitrary decision. It may be based on experience with similar installations or may be established by a health or safety code. Many fan manufacturers have published charts that show recommended rates of air change for typical installations. Although the rate of air change method of calculating air volume has been used for many years, Buffalo Fan engineers have found it unsatisfactory except in relatively small buildings or rooms. For jobs that involve personnel comfort. this method is not recommended if the building is over 50,000 cubic feet in content or more than l00′ in length.

Considerations for Building Ventilation

The volume of air required to operate a ventilating and cooling system is a very fundamental requirement. Before air volume is estimated or calculated, careful consideration should be given to the following factors. Be sure that the decision you make will accomplish the most important objectives or will overcome the most important problems. This should be the overriding consideration in the selection of a system of ventilation. Availability of money to finance the system is a factor that must be considered early in the planning stage. The funds available will affect the objectives you set and will influence the system of ventilation selected to meet the objectives.

CFM per square foot of floor area method

CFM per square foot of floor area method: this method of calculation is a modern adaptation of the rate of air change formula. Total air volume (cubic feet per minute) is determined by multiplying the total square feet of floor area by an arbitrary CFM per square foot figure. The figure selected may be as low as 2 CFM or as high as 12 CFM per square foot. Four CFM per square foot has been recommended as a minimum for summer ventilation of large assembly type operations. This method of calculation, like the rate of air change method, is likely to produce unsatisfactory results in many cases. Failure to control air distribution and air velocity can be a major weakness in the whole concept. Selection of a CFM per square foot figure should be based on experience and a proven method of air distribution.

Rate of air velocity method

Rate of air velocity method: This method of calculating air volume needed for a system is highly recommended by American Coolair. A breeze conditioning system can be highly effective in providing personnel comfort in hot weather if the recommendations outlined below are observed. It has been determined from field experience that an average air velocity of 150 feet per minute (FPM) to 200 FPM is usually sufficient for personnel cooling under summertime conditions. The CFM required to do the job is calculated by multiplying the cross section of an area through which the air is to move by the desired velocity. This is expressed in the following formula.

Factors Affecting Average Air Velocity

As building size increases, there are factors that will affect the average air velocity through the cross section of the building. The longer the building, the greater the amount of air leakage from windows, doors, elevator shafts, etc. To offset this air leakage, air velocity should be increased. This is done by relating the calculated velocity to the length of the building. The results will provide an effective velocity of approximately 150 ft./min.

Industrial Ventilators

In some buildings. it is not possible or practical to install a complete ventilation system. In such situations, zone cooling may be effectively used. The problem is similar to a spot cooling application, but usually involves a relatively larger area. Effective zone cooling may be accomplished by use of air circulators. See Air circulation below. A very satisfactory zone cooling method is the use of supply-type PRVs to flood the problem area with fresh, cooler air. The adjacent drawing and zone cooling table illustrate the capacity of several American Coolair PRV models to effectively cool an area. The figures are based on discharge of air approximately l5 feet above floor level.

Additional information can be found at the Canada Blower company web site http://canadablower.com/ahu/index.html

Susan Terlitski
Air Handling Units Engineer
Canada Blower
canadablower@canadablower.com
http://canadablower.com/hvac/index.html
http://canadablower.com/oem/index.html

Adequate Buildings Ventilation

canadablower@canadablower.com

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buffaloblowercom

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Roof Ventilators

It can decrease make up of heat in the roof spaces; reduce the heat load on the isolation. In turn, you will make save on your electricity bills as the air-conditioning systems will not have to work as hard.

In winter, it decreases the amount of condensation that forms when warm moist air from exhaust fans meets cold surfaces also reduce the amount of corrosion and wood is created due to condensation. It should be installed where no sarking with tile roofs, metal roof deck is used, and when there is evidence of condensation in the attic or ceiling.

How Roof Ventilators Work

Accurate ventilation needs that there be a flow of air into the room and the temperature and humidity should be maintained within a range that allows adequate evaporation of sweat from the skin. It was previously thought that the anxiety, nuisance and laziness often linked with bad ventilation were caused totally by the enhance in the quantity of CO2 and decreased oxygen in the air. There is proof, however, that the effects depend largely on the interference with the mechanism of heat regulation in the body. Lack of air flow and increase the relative humidity and temperature prevent normal evaporation of perspiration and heat loss from the skin surface.

Roof Exhausters

Roof exhauster is essentially a simple hole in the roof with a cover to protect from rain and wind to avoid interfering with its operation. A useful addition is a fan stirring the air or gas to move from one place to another. Mechanical fan blades of bearing is used for ventilation, in manufacturing, in winnowing grain, to remove dust, cuttings or other debris, or plans to offer a fire. The addition of distribution channels for the fan and a system to force air into the building provides greater efficiency. The outputs are designed for maximum mixing of air and move large amounts of air at low speed so that the temperature of the layers is removed. The factories are equipped with unusual suction hoods for dust boxes located smoke and heat.

Essential Uses and Attributes of Quality Roof Ventilators

Deep mines, underwater tunnels and other underground environments and underwater systems require development of mechanisms for maintaining air flow in a healthy state. Life for those working or traveling in these areas depend on a constant supply of fresh air, not only must the systems are very effective, but it should be possible in an emergency in case of failure of the device running. Derived from studies of the problems of ventilation systems is the development of methods of air conditioning heat pump is a device that the reversible mechanical work to extract heat from a cooler place and deliver heat to a warmer place. Heat is supplied to a warmer place, about the sum of the initial heat and work.

These systems, unlike conventional methods of ventilation, independent of outside weather conditions and can be stored indoors, temperature, humidity and healthier environment, and the air is free of dust and other harmful substances. They achieve this, however, significant energy costs.

A trustworthy ventilation arrangement that can function throughout a fire is both fundamental and significant. It prevents smoke logging, allows people to escape quickly, reducing damage to property and contents and enables firemen to attack the fire without hindrance. These power roof exhausters have the added advantage that the normal day to day ventilation and in many cases can also be equipped with working channels for use in multi-storey buildings.

For additional information please refer to http://industrialblowerfan.com

Susanna Terlitskaia
Industrial Ventilating Engineer
Industrial Blower Fans Company
nis@primus.ca
http://www.industrialblowerfan.com/air-cooling-unit.html
http://www.industrialblowerfan.com/profile.html

Roof Ventilators

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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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