Proper Sizing Of Attic Fan

If your whole house fan doesn t have the proper ventilation it s not going to work very well either. To determine the size of your attic multiply the width by the length of the attic floor in feet. Divide the result by 60 minutes to find the cubic feet per minute or cfm that your fan must move for whole house ventilation.

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This is a quick rundown of the different types of attic fans their most common features and.

Proper sizing of attic fan.

By sizing and implementing a whole house fan you can pull the warm stale air from your entire home into the attic where it s vented outside. By dispelling hot air from your attic an attic fan can reduce the temperatures of your upper level rooms by 10 degrees extend the life of your roof shingles and cut air conditioning expenses by up to 30 percent. The warm air escapes through the attic and to the attic vents allowing the circulation of chilly air from the windows. This attic ventilation calculator computes the size and number of solar powered attic fans to achieve the proper ventilation for your attic.

Simultaneously cool fresh air will be pulled through the open windows and circulated through every room effectively replacing all of the air in your home and minimizing your dependence on air conditioning. Without an attic fan the temperature in your attic can climb to a searing 150 degrees. You will want to check your fan to ensure that its cfm rating is anywhere between 1 600 and 4 500. If you have a regular sized bedroom of 144 to 225 square feet then a medium ceiling fan with a blade span of 44 to 50 inches will be a great fit.

Measure the length and width of the attic floor space to be ventilated. How to size attic exhaust vent fans for your home attic size. It helps to cool your home temperatures and the attic by approximately 30 degrees. For instance if your house has an overall floor area of 1 500 square.

Next multiply the square feet of attic space by 0 7 to get the minimum number of cubic feet of air per. The whole house fan is installed inside the attic between the living space and ceiling. It ll fill the attic with hot air which will stop it from pulling more air into the. Whole house fans work on the principle of removing the hot and humid air out of the house.

In terms of sizing your ceiling fan for your bedroom there are two common size options for bedrooms.

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