For a medium attic on a roof that faces away from the sun, where the tilting panel earns its keep. On a south facing roof the 25 W model is better value.
Price checked November 2, 2026. As an Amazon Associate we earn from qualifying purchases.
Every QuietCool Solar Roof model we rank, smallest first. Ratings compare each against its own mount.
| Model | Airflow | Rating | Price |
|---|---|---|---|
| QuietCool AFR SLR-25 Solar Roof Fan | 927 CFM | 3.0/5 | $279 |
| QuietCool AFR SLR-40 Solar Roof Fan (this one) | 1,085 CFM | 3.3/5 | $439 |
The rating comes from 5 measured or published factors, each scored 0-100 against fixed reference points for its mount. How we rank explains each one.
| Model number | AFR SLR-40 |
|---|---|
| Airflow | |
| Mount | Roof |
| Airflow | 1,085 CFM |
| Attic area | 1,450 sq ft |
| Motor | 24V brushless DC, IP67 |
| Power | |
| Panel | 40 W |
| Separate or tilting panel | Yes |
| Thermostat | Yes |
| AC backup | Yes |
| Build | |
| Warranty | 15 years |
A well equipped hybrid roof fan with a long warranty at a mid range price, for medium attics. Buy the 301A, which includes the night adapter for the same price as the 301.
Amazon $344.99A flexible hybrid fan with speed control for a buyer who wants night running on a budget. The lack of a stated warranty is the main risk.
Amazon $299.99A hybrid roof fan with a thermostat for a medium attic at a fair price. The newer 50 W model is the better buy if the price gap stays small.
Amazon $299.90Compare the QuietCool AFR SLR-40 Solar Roof Fan with any other solar attic fan →
More from QuietCool: every QuietCool product ranked.
