QuietCool AFG SLR-40 Solar Gable Fan
#1 in Gable mountFull review
The best documented gable fan here, for an attic with a gable vent big enough to let its air out. Its long warranty and included adapter justify the price.
QuietCool $359$359
The QuietCool AFG SLR-40 Solar Gable Fan rates 3.7 among gable mount solar attic fans; the QuietCool AFR SLR SMT 50W Roof Fan rates 2.8 among roof mount ones. The QuietCool AFG SLR-40 Solar Gable Fan costs $80 less ($359 vs $439).
QuietCool AFR SLR SMT 50W Roof Fan
#11 in Roof mountFull review
For a homeowner who wants to watch and control attic conditions from a phone and run around the clock. Buyers after the most airflow per dollar should look elsewhere.
Amazon $439.99 QuietCool $439$439
Prices were last checked November 2, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Scores side by side
These two sit in different mount classes (gable mount and roof mount), and each is scored against the reference points for its own class, so a rating says how well each does among its own mount peers. How we rank explains each factor.
| Factor weight | QuietCool AFG SLR-40 Solar Gable Fan | QuietCool AFR SLR SMT 50W Roof Fan |
|---|---|---|
| Overall rating | 3.7/5 | 2.8/5 |
| Value 25% | 54 $0.23 per CFM ($359, 1,566 CFM) | 24 $0.39 per CFM ($439, 1,119 CFM) |
| Airflow 15% | 51 1,566 CFM | 27 1,119 CFM |
| Panel 20% | 60 40 W panel | 80 50 W panel |
| Features 15% | 100 thermostat, AC backup, separate or tilting panel | 70 thermostat, AC backup |
| Warranty 25% | 58 15-year warranty | 0 warranty not published, scored as none |
Specifications
| QuietCool AFG SLR-40 Solar Gable Fan | QuietCool AFR SLR SMT 50W Roof Fan | |
|---|---|---|
| Airflow | ||
| Mount | Gable | Roof |
| Airflow | 1,566 CFM | 1,119 CFM |
| Attic area | 2,000 sq ft | 1,500 sq ft |
| Motor | 24V brushless DC, IP67 | DC |
| Power | ||
| Panel | 40 W | 50 W |
| Separate or tilting panel | Yes | - |
| Thermostat | Yes | Yes |
| AC backup | Yes | Yes |
| Build | ||
| Warranty | 15 years | - |
| Released | - | 2026-06 |