Because ventilation equipment must match the purpose, we can recommend the type, size, location and special characteristics to meet your needs.

Whole House Fans - Ventilate for cooling. 
There are a wide variety of types and systems.  They can be mounted just about anywhere (ceilings, closets, crawl space, attic, etc.. They are typically located in a central area to help evenly remove warm air from the living space. When a whole house fan is turned on it helps draw warm air out of the living space while drawing in cooler outside air from open windows.

Sizing a whole house fan  -  Whole house fans are sized in cubic feet per minute (cfm) of ventilating power. To determine the size you'll need, first calculate the volume of your house in cubic feet. To do that, multiply the square footage of the floor area you want to cool by the height from floor to ceiling. Take that volume and multiply by 30 to 60 air changes per hour (depending on the power you need). Then, divide by 60 minutes to get the cubic feet per minute of capacity your house requires:
(Square feet ______ × room height ______) × 30 or 60/ 60 = cfm required _________.

Installing and using a whole house fan  -  Installing a whole house fan is tricky and should be done by a professional. An experienced professional should perform your attic measurements and install your dedicated circuit wiring and, if needed, your new attic vents.

Attic ventilation will usually need to be increased to exhaust the fan's air outdoors. You'll need 2 to 4 times the normal area of attic vents, or about one square foot of net free area for every 750 cubic feet per minute of fan capacity. The net free area of a vent takes into account the resistance offered by its louvers and insect screens. More vent area is better for optimal whole house fan performance.

If your fan doesn't come with a tight-sealing winter cover, you should either buy one or build one. If you switch between air conditioning and cooling with a whole house fan as the summer weather changes, build a tightly sealed, hinged door for the fan opening that is easy to open and close when switching cooling methods.

Be cautious when operating these large exhaust fans. Open windows throughout the house to prevent a powerful and concentrated suction in one location. If enough ventilation isn't provided, the fans can cause a backdraft in your furnace, water heater or gas-fired dryer, pulling combustion products such as carbon monoxide into your living space.

Gable Attic Fans - are mounted to the gable wall inside the attic behind a decorative louver. The gable attic fan is connected to a proper power supply and a timer. The timer allows the fan to run during the hottest portion of the day. The gable attic fan helps reduce the attic temperature to help prevent heat transfer down through the insulation and into the living space. Gable attic fans are typically much cheaper than whole house fans and also easier to install.

   That's why we are "The Able Group"     610-853-8311
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Whole House Fans Estimates Online        by The Able Group Contractors.

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