Centric Air 3.4
An efficient ducted fan with a 15-year motor warranty for a typical home.
Amazon $1,497 Centric Air $1,449$1,449
The Centric Air 3.4 is the better whole house fan overall, rated 3.8 to 3.7. The Centric Air 3.4 leads on efficiency. The QuietCool Classic CL-4700 RF wins on value. The QuietCool Classic CL-4700 RF costs $340 less ($1,109 vs $1,449).
QuietCool Classic CL-4700 RF
A ducted Classic fan with a 10-year warranty for a typical home. It costs less up front than the Energy Saver but draws more power.
Amazon $1,109$1,109
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 Centric Air 3.4 for efficiency (8.5 CFM per watt vs 5.9 CFM per watt).
- Choose the QuietCool Classic CL-4700 RF for value ($343.34 per 1,000 CFM ($1,109, 3,230 CFM) vs $446.95 per 1,000 CFM ($1,449, 3,242 CFM)).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 3,001 to 5,000 CFM whole house fan; a clear win is highlighted. How we rank explains each one.
| Factor weight | Centric Air 3.4 | QuietCool Classic CL-4700 RF |
|---|---|---|
| Overall rating | 3.8/5 | 3.7/5 |
| Value 30% | 50 $446.95 per 1,000 CFM ($1,449, 3,242 CFM) | 68 $343.34 per 1,000 CFM ($1,109, 3,230 CFM) |
| Efficiency 20% | 58 8.5 CFM per watt | 15 5.9 CFM per watt |
| Noise 15% | 70 49 dBA at high speed | 69 49.4 dBA at high speed |
| Damper 10% | 33 R-5 insulated damper | 33 R-5 insulated damper |
| Warranty 25% | 100 15-year warranty on the motor | 100 10-year warranty on the motor |
Specifications
| Centric Air 3.4 | QuietCool Classic CL-4700 RF | |
|---|---|---|
| Airflow | ||
| Airflow, high speed | 3,242 CFM | 3,230 CFM |
| Power, high speed | 382 W | 551 W |
| Efficiency | 8.5 CFM/W | 5.9 CFM/W |
| Speeds | 2 | 2 |
| Noise | 49 dBA | 49.4 dBA |
| Install | ||
| Mount | Ducted | Ducted |
| Damper | R-5 insulated | R-5 insulated |
| Ceiling opening | 14 x 26 in | 14.25 x 30.25 in |
| Attic vent area needed | 4 sq ft | 5.9 sq ft |
| Voltage | 120 V | 120 V |
| Remote or wall control | Yes | Yes |
| App or remote monitoring | - | No |
| Warranty | ||
| Warranty | 15 years | 10 years |