This attic ventilation calculator computes the size and number of solar powered attic fans to achieve the proper ventilation for your attic. The Home Ventilation Institute (www.hvi.org) recommends that powered attic ventilators provide a minimum of 10 air volume changes per hour.
Step 2. Use the chart below as an attic vent fan CFM calculator.
up to 1700 | (1) / 30 Watt | 825 |
1701 to 3400 | (2) / 30 Watt | 1650 |
3401 to 5100 | (3) / 30 Watt | 2475 |
5101 to 6800 | (4) / 30 Watt | 3300 |
ATTIC BREEZE (shop)
up to 1350 | (1) / 20 Watt | 650 |
1351 to 1550 | (1) / 25 Watt | 750 |
1551 to 2700 | (2) / 20 Watt | 1300 |
2701 to 3100 | (2) / 25 Watt | 1500 |
3101 to 4050 | (3) / 20 Watt | 1950 |
4051 to 4650 | (3) / 25 Watt | 2250 |
4651 to 5400 | (4) / 20 Watt | 2600 |
5401 to 6200 | (4) / 25 Watt | 3000 |
*Note: Adequate intake area is essential to ensure proper operation of your powered attic vent fan and to avoid attic.
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