Attic Fans Cfm
Select if your roof is more flat of peaked.
Attic fans cfm. The formula above gives an approximate value of the cfm needed for an attic fan. The most powerful box fan available is the lasko 3723 which has 2500 cfm. Enter the length and width of your attic or ceiling crawl space. New quietcool quietcool 1959 cfm 2 speed gable mount attic fan model afg pro 2 0 109 00 109 00.
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. To facilitate faster air exchange would necessitate choosing a fan with a higher cfm. As the attic cools the smart fan will automatically cycle down to lower speeds the lowest being 1 000 cfm which only uses 15 watts of energy resulting in a cheaper air conditioning bill and cooler home temperature temperatures can drop as much as 50 degrees these two factors make it an excellent energy and cost saver. Set your store to see local availability add to cart.
Then enter the height at the highest point. Divide the cubic feet measurement by the cfm rating assigned to the fan. 1500 cfm weatherwood galvanized steel electric powered attic fan with adjustable thermostat the high efficiency powered attic ventilator comes with the high efficiency powered attic ventilator comes with a ecm electronically commutated motor with an on board computer to monitor and adjust to the temperature and humidity in the attic. Attic x 0 7 700 cfm minimum fan rating add an additional 20 cfm x 1 20 if you have a steep roof and 15 cfm x 1 15 for a dark roof.
Box fan cfm can vary depending of the size of the fan. 17600 cubic feet 1600 11 what this means is that every eleven minutes the air in the home is being exchanged by a fan of this rating along with having windows open in each room. Attic venting fans attic fans serve a different function removing the hot and moist air from the attic and leaving the space below the attic floor alone. 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.
For heating and air conditioning airflow or for other exhaust fan situations see our airflow calculator. Iliving 16 wall mounted shutter exhaust thermostat control 3 speeds vent fan for home attic shed or garage ventilation 1200 cfm 1800 sqf coverage area variable silver 4 6 out of 5 stars 487 136 62 136. For a 20 box fan the cfm can range from around 1000 cfm up to 2500 cfm. Below we list the top box fans cfm.
Cfm cubic feet per minute is a measure of the amount of air the fan moves in a minute. Then click on calculate.
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