QuietCool AFG SLR SMT 50W Gable Fan
#3 in Gable mountFull review
For a gable vented attic where the owner wants app control and steady airflow around the clock, at the same price as the simpler AFG SLR-40.
Amazon $359$359
The QuietCool AFG SLR SMT 50W Gable Fan rates 3.3 among gable mount solar attic fans; the OmniPV OP-SAF-40 Hybrid Solar Attic Fan rates 3.2 among roof mount ones. The OmniPV OP-SAF-40 Hybrid Solar Attic Fan costs $59.10 less ($299.90 vs $359).
OmniPV OP-SAF-40 Hybrid Solar Attic Fan
#8 in Roof mountFull review
A 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 $299.90$299.90
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 SMT 50W Gable Fan | OmniPV OP-SAF-40 Hybrid Solar Attic Fan |
|---|---|---|
| Overall rating | 3.3/5 | 3.2/5 |
| Value 25% | 61 $0.20 per CFM ($359, 1,780 CFM) | 72 $0.17 per CFM ($299.90, 1,800 CFM credited of 2,100 claimed (45 per panel watt)) |
| Airflow 15% | 62 1,780 CFM | 63 1,800 CFM credited of 2,100 claimed (45 per panel watt) |
| Panel 20% | 80 50 W panel | 60 40 W panel |
| Features 15% | 70 thermostat, AC backup | 70 thermostat, AC backup |
| Warranty 25% | 0 warranty not published, scored as none | 0 warranty not published, scored as none |
Specifications
| QuietCool AFG SLR SMT 50W Gable Fan | OmniPV OP-SAF-40 Hybrid Solar Attic Fan | |
|---|---|---|
| Airflow | ||
| Mount | Gable | Roof |
| Airflow | 1,780 CFM | 2,100 CFM |
| Attic area | 2,250 sq ft | - |
| Motor | DC | brushless DC |
| Power | ||
| Panel | 50 W | 40 W |
| Thermostat | Yes | Yes |
| AC backup | Yes | Yes |
| Build | ||
| Weight | - | 17.2 lb |
| Released | 2026-09 | - |