Attic Fan Cfm Size

Enter the length and width of your attic or ceiling crawl space.

Attic fan cfm size.

Fans are sold on the basis of diameter or the cfm of air they move. Too high of a cfm and you ll be. Ventilation rate of 10 air changes per hour. 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.

The higher the cfm cubic feet per minute the more airflow a fan can produce. Then enter the height at the highest point. Remington solar 1280 cfm powder coated galvanized steel hybrid solar electric powered attic fan model sf20 blk 315 00. Remington solar 25 watt 1420 cfm gray solar powered attic fan model sf25 gr 339 00 339 00.

Set your store to see local availability add to cart. Attic fan size calculation. Attic fan size cfm 0 7 x sq ft area of the attic formula 1 the size of an attic fan is calculated in terms of cfm. Cubic feet per minute or cfm is the amount of cubic feet of air per minute the fan moves.

For heating and air conditioning airflow or for other exhaust fan situations see our airflow calculator. 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. For open blade fans see our ceiling fan calculator. Having an understanding of this makes choosing the correct fan size for your home an easier process.

Add an additional 20 cfm x 1 20 if you have a steep roof and 15 cfm x 1 15 for a dark roof. A 30 inch fan will move 5 700 cfm. Proceed to step 2 and use the chart to determine the size and number of solar powered attic ventilation fans required to achieve a min. Understanding whole house fan cfm.

For example a typical 36 inch diameter whole house fan will move 6 900 cfm of air. Attic vent fans are commonly rated from 800 to 1 600 cfm making one fans suitable for attics of up to around 2 200 square feet. Whole house fans come in a variety of sizes determined by the amount of air they circulate or whole house fan cfm. The formula above gives an approximate value of the cfm needed for an attic fan.

Select if your roof is more flat of peaked. Choose a fan that matches your home or attic s size for optimal performance.