QuietCool AFG SLR-40 Solar Gable Fan
#2 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 Natural Light SAF32 Solar Attic Fan rates 3.2 among roof mount ones. The QuietCool AFG SLR-40 Solar Gable Fan costs $295.70 less ($359 vs $654.70).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
Natural Light SAF32 Solar Attic Fan
#12 in Roof mountFull review
For a medium attic where a lifetime warranty and an all aluminum build matter more than price. Cheaper hybrid fans move as much air for less than half the money.
Amazon $654.70$654.70
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 | Natural Light SAF32 Solar Attic Fan |
|---|---|---|
| Overall rating | 3.7/5 | 3.2/5 |
| Value 25% | 54 $0.23 per CFM ($359, 1,566 CFM) | 15 $0.45 per CFM ($654.70, 1,440 CFM credited of 1,560 claimed (45 per panel watt)) |
| Airflow 15% | 51 1,566 CFM | 44 1,440 CFM credited of 1,560 claimed (45 per panel watt) |
| Panel 20% | 60 40 W panel | 44 32 W panel |
| Features 15% | 100 thermostat, AC backup, separate or tilting panel | 30 separate or tilting panel |
| Warranty 25% | 58 15-year warranty | 100 lifetime warranty |
Specifications
| QuietCool AFG SLR-40 Solar Gable Fan | Natural Light SAF32 Solar Attic Fan | |
|---|---|---|
| Airflow | ||
| Mount | Gable | Roof |
| Airflow | 1,566 CFM | 1,560 CFM |
| Attic area | 2,000 sq ft | 2,200 sq ft |
| Motor | 24V brushless DC, IP67 | DC |
| Power | ||
| Panel | 40 W | 32 W |
| Separate or tilting panel | Yes | Yes |
| Thermostat | Yes | No |
| AC backup | Yes | No |
| Build | ||
| Warranty | 15 years | Lifetime |