Manufacturer of I.D.
blowers, F.D. blowers, force draft fans, force draft blowers, blow off
ventilators / fans, PVC FRP SST ventilators, squirrel cage blower fans,
high pressure centrifugal ventilators, Chicago blowers, aluminum fans,
stainless steel ventilators, hot air blowers, heating fans, high
temperature oven ventilators, high pressure air blowers, squirrel cage
blower wheels, Peerless Dayton ventilators, Sheldons blowers, New York
fans NYB, TCF, Delhi fans blowers. Industriall fans and blowers
engineering sales, roof and wall air make up and exhaust fan
ventilators, high temperature pressure blowers and high capacity
centrifugal and axial blowers, fans and high CFM ventilators.
The Positive Pressure Blower is a high volume fan use to pressurize a
burning structure, in case of fire, in order to force the smoke out.
Positive Pressure Blowers are portable, gasoline powered fans, most of
which utilize a 5.5 horsepower engine. The theory of positive pressure
ventilation is based on the principal of even pressure distribution.
Once a structure is pressurized, air and smoke can be forced out
through any opening (similar to escaping from an inflated baloon).
Power roof ventilators of the
type manufactured by Buffalo Fan are very similar in basic design to
the wall fans. Size and capacity closely parallel the wall fans. One of
the most popular PRVs is the upblast exhauster. This unit utilizes air
velocity to expel rain or snow that may try to penetrate into the
structure. When the unit is not in service, butterfly dampers
effectively seal the opening against the weather. Because of the
straight through air flow design, this is the most effective and
efficient PRV available. American Coolair's hooded PRV design is
similar to the upblast PRV. Instead of butterfly dampers, a stationary
hood shields the unit from rain and snow. A backdraft damper prevents
air infiltration when unit is not in use. The hood offers some
resistance to air flow. For this reason, the upblast PRV is more
efficient and economical. PRVs are specified by many design engineers
because they are roof located and away from operations within the
structure. Maintenance and service can be performed from a roof
location. Cost per CFM may exceed by a small margin that of wall
fans with equal capacity. However, the advantages may more than
offset the slight disadvantage of unit cost.