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A Simple Calculation of Fan Efficiency
When comparing fans, divide the fan’s CFM by the motor horsepower. This tells you how much air you actually get out of all those engine “horses” you are going to buy, store, lift, and listen to. |
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Of the various VENTRY® Fan models, our electric 1.5 hp fans are our most efficient. 12,000 CFM divided by 1.5 horsepower = 8,000 CFM-per-horse. That is a lot of air for a little motor! Of our gas models, the 24 inch GX120 is the most efficient (longest propeller and smallest motor), pushing 5,700 CFM per horse (20,000 CFM divided by 3.8 hp). Below is the chart showing this simple calculation done for all of our fans. (Also shown on our specs page).
| Model # |
Air Volume
(CFM) |
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How much Air do you get ‘per Horse’?
(CFM divided by Horsepower)
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| 20E1.5 |
12,080 |
1.5 |
8053 |
| 20E1.5GFCI |
12,080 |
1.5 |
8053 |
| 20GX120 |
16,500 |
3.5 |
4714 |
| 20GX160 |
17,300 |
4.8 |
3604 |
| 24GX120 |
20,000 |
3.5 |
5714 |
| 24GC160 |
23,800 |
4.6 |
5174 |
| 24GX160 |
24,000 |
4.8 |
5000 |
| 24GX200 |
29,500 |
5.5 |
5364 |
| 24LP |
22,000 |
4.7 |
4681 |
We figured out CFM-per-horse on multiple brands several years ago and have not had the time to do it since, but the relative data is still interesting. Click here to see the 2005 calculations.
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