Quick supply of idustrial
axial fans, air circulation ventilators, warehouse ventilators, high
volume ventilation fans, hot air ventilation fans, industrial exhaust
fans, portable industrial blowers, garage ventilators, PRV roof fans,
explosion proof pressure blowers, wall ventilators, fan wheel blades,
combustion pressure blowers, pvc ventilators, ID fans, FD fans, force
draft ventilators, induse draft blowers, propylene & FRP PVC
ventilators, spark-resistant blowers, sealed ventilators, dust
collector ventilators & fans. Industrial air handling gas fired
units
and air make-up power roof / wall ventilators fans. Sales of industrial
process pressure blowers, dust collection radial fans, vacuum pressure
blowers for Buffalo, New York Blower and Chicago Blower, TCF NYB high
temperature
oven circulating and exhaust fan ventilators, OEM blower / fan wheel
blades.
American Blowers Co. has jdeveloped new Low Profile Positive Pressure
Ventilators that have been designed to fit in tight compartments ans
small spaces without scarificing performance or features. These compact
ventilation blowers are available is both gasoline driven conviguration
and with 115/230V single phase electric motor.
The method selected for
calculating air volume will relate closely to the objectives to be
accomplished by the system. Based on the objectives and funds
available, you can now consider the alternatives 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. 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: 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: 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. 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. 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.
Heavy-duty
high-pressure air-knife blowers for tough industrial process
applications;
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Blow-off blowers, process cooling, conveyor cleaning fans,
process blowers;
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Pressures to 10 PSIG, velocities to 40,000 Ft/min, air
volumes to 10,000 CFM;
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Adjustable volume & pressure systems;
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Variety of blower types available - centrifugal pressure
blowers, regenerative, rotary-lobe, multistage... depending on pressure
required;
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Aluminum, steel, stainless steel, plastic blower options,
variety of styles and sizes
