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 is the better solar attic fan overall, rated 3.7 to 2.2. The QuietCool AFG SLR-40 Solar Gable Fan leads on features, warranty and panel. The Master Flow PGSOLAR Solar Gable Fan costs $124.05 less ($234.95 vs $359).
Master Flow PGSOLAR Solar Gable Fan
#5 in Gable mountFull review
For a small attic with a gable vent where a known roofing brand and a labor backed warranty matter more than airflow.
Amazon $234.95$234.95
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.
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), warranty (15-year warranty vs 5-year warranty) and panel (40 W panel vs 15 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 | Master Flow PGSOLAR Solar Gable Fan |
|---|---|---|
| Overall rating | 3.7/5 | 2.2/5 |
| Value 25% | 54 $0.23 per CFM ($359, 1,566 CFM) | 30 $0.35 per CFM ($234.95, 675 CFM credited of 685 claimed (45 per panel watt)) |
| Airflow 15% | 51 1,566 CFM | 4 675 CFM credited of 685 claimed (45 per panel watt) |
| Panel 20% | 60 40 W panel | 10 15 W panel |
| Features 15% | 100 thermostat, AC backup, separate or tilting panel | 30 separate or tilting panel |
| Warranty 25% | 58 15-year warranty | 17 5-year warranty |
Specifications
| QuietCool AFG SLR-40 Solar Gable Fan | Master Flow PGSOLAR Solar Gable Fan | |
|---|---|---|
| Airflow | ||
| Mount | Gable | Gable |
| Airflow | 1,566 CFM | 685 CFM |
| Attic area | 2,000 sq ft | 800 sq ft |
| Motor | 24V brushless DC, IP67 | - |
| Power | ||
| Panel | 40 W | 15 W |
| Separate or tilting panel | Yes | Yes |
| Thermostat | Yes | - |
| AC backup | Yes | No |
| Build | ||
| Weight | - | 27 lb |
| Warranty | 15 years | 5 years |