Another note regarding comparison to other products, many other products on the market have not been updated in several years and most have not passed the latest certifications because the law states that any changes to a product must be retested. However, you will find most tests linked on the respective companies website are several years old. So, this means the latest versions have not even been tested, which is never the case with Solar Royal products or could mean the possible product being offered has not been technically updated in many years – both scenarios in our opinion is not in your best interest.
Use following calculations so you can verify our comparison matrix yourself. You can also check with your roofer, green energy audit company, builder, or contractor to verify the following comparison matrix in relation to what you are looking to ventilate (we will have automatic calculator).
There are various types of intake. The air being exhausted needs replaced by outside air drawn through unobstructed air vents. These soffits are normally found under the eaves on a home but the key is that for air to properly be exhausted the intake must be cleared, regardless of application. First, to calculate the total minimum vent intake area in square inches, divide the CFM ratings of the solar ventilation by 300 and multiply the result by 144 which will give you the Net Air Intake as recommended by hvi.org.
Calculation demonstration: 1300 ÷ 300, then × 144 = 624 net air intake required. Then the Solar Royal Attic Fan moves up-to ~78’000 cubic feet per hour. The intake must be balanced for it to do it’s job. So, ~4.2 sqft of Net Free is suggested per fan. In addition, one of the best features of a solar attic fan is the cost savings. Please note that this is only an estimate, however it gives a clear comparison of solar fans vs. electric ventilation. The figures also do not take into consideration the energy savings from keeping your attic cooler.