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 and the Natural Light SAF48G Solar Gable Fan are evenly matched, rated 3.7 and 3.6. The QuietCool AFG SLR-40 Solar Gable Fan leads on features. The Natural Light SAF48G Solar Gable Fan wins on warranty and panel. The QuietCool AFG SLR-40 Solar Gable Fan costs $344.70 less ($359 vs $703.70).
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 SAF48G Solar Gable Fan
#3 in Gable mountFull review
For a larger gable vented attic where the owner wants a big panel and a lifetime warranty. Night running needs a hybrid fan instead.
Amazon $703.70$703.70
Which should you buy?
- Choose the QuietCool AFG SLR-40 Solar Gable Fan for features (thermostat, AC backup, separate or tilting panel vs separate or tilting panel).
- Choose the Natural Light SAF48G Solar Gable Fan for warranty (lifetime warranty vs 15-year warranty) and panel (48 W panel vs 40 W panel).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every gable mount solar attic fan; a clear win is highlighted. How we rank explains each one.
| Factor weight | QuietCool AFG SLR-40 Solar Gable Fan | Natural Light SAF48G Solar Gable Fan |
|---|---|---|
| Overall rating | 3.7/5 | 3.6/5 |
| Value 25% | 54 $0.23 per CFM ($359, 1,566 CFM) | 26 $0.37 per CFM ($703.70, 1,881 CFM) |
| Airflow 15% | 51 1,566 CFM | 67 1,881 CFM |
| Panel 20% | 60 40 W panel | 76 48 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 SAF48G Solar Gable Fan | |
|---|---|---|
| Airflow | ||
| Mount | Gable | Gable |
| Airflow | 1,566 CFM | 1,881 CFM |
| Attic area | 2,000 sq ft | 2,825 sq ft |
| Motor | 24V brushless DC, IP67 | DC |
| Power | ||
| Panel | 40 W | 48 W |
| Separate or tilting panel | Yes | Yes |
| Thermostat | Yes | No |
| AC backup | Yes | No |
| Build | ||
| Warranty | 15 years | Lifetime |