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Industrial, Commercial and Architectural Grade Dampers, Shutters and Louvers
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| Backdraft Dampers are generally used in front of exhaust fans or in conjunction with a gravity intake ventilator and are either blown or sucked open by the force of the fan. They allow air flow in only one direction and typically prevent air flow from coming back into the building or structure. Common backdraft damper materials are Galvanized Steel, PVC, Aluminum and Stainless Steel. Most back draft dampers (consult factory) have a minimum velocity rating between 2,000 - 3,200 feet per minute (fpm).
Wall Louvers are often stationary but sometimes adjustable. Wall louvers typically have slats that are available in different depths and angles depending on their use and are designed to allow fresh air to pass through and sometimes light without allowing direct sunshine, rain and noise to pass through. Louvers usually have bird and or insect screens to prevent unwanted pests from entering but typically remain open even during cold temperatures. It is important to note the maximum velocity rating of the louvers and the total volume of air (CFM) passing through the louvers. Wall louvers typically have a maximum velocity rating and if exceeded, it is possible to bring moisture, rain, etc. into your building. Please consult product specification to ensure the velocity traveling through the wall louver does not exceed the maximum recommended velocity at water penetration. The CFM rating of the wall louver can be determined by multiplying the velocity rating in Feet per Minute (FPM) x Free Air in Square Feet (FT²) = (CFM) Cubic Feet per Minute.
Inlet Shutters are essential to a well designed ventilation system. Inlet shutters allow fresh air to come into your manufacturer facility, warehouse, agricultural building or greenhouse where it is properly mixed with existing stagnant air and exhausted through a separate exhaust fan system. Inlet shutters are sometimes manually operated (opened or closed by hand) or automated through an actuator and linkage system. Fresh air intakes or inlet shutters can also be operated by thermostats, on/off switches or placed on the same circuit as your exhaust fan system so they can open or close at the same time. Inlet Shutters typically have a higher velocity rating than louvers but be careful to not bring moisture into your building with exhaust fans are being used. Weather hoods are typically used with Fresh Air Inlet or Intake Shutters to keep rain, snow and moisture from entering your building when exhaust fans are in operation. |
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