Provided that the weather is completely sunny, the solar panel is perfectly clean and is facing in the right direction with direct sunlight similar to the summer months that have the strongest rays, only then could the maximum amount of CFM be achieved.

The CFM rates being advertised by manufacturers are at peak performances which occur only in perfect conditions. Solar fans are extremely sensitive and any variable mentioned above plus other factors not mentioned here can and will dramatically affect your solar fans CFM performance. Any aggressive installation calculations would result in an under-vented attic.

For the above reasons and more, the Solar Attic Fan should still be calculated at the "1 to 300 rule" and not beyond. Any additional performances that the solar fan can provide should not be acknowledged and calculated into the installation design. One should rely solely on the calculations for ventilation based on the net free air inches of the roof vent or fan in relation to the attic space being ventilated. The benefit of the solar power would be an auxiliary hot air exhaust on those hot sunny summer days, but should not be used to calculate beyond its net free air space.

Page 2 of 2 :: First | Last :: Prev | 1 2 | Next