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 3.3. The Centric Air 3.4 leads on warranty, value and noise. The AirScape Sierra 3400 wins on efficiency and damper. The Centric Air 3.4 costs $600 less ($1,449 vs $2,049).
AirScape Sierra 3400
A premium ducted fan for a typical home in a cold or mixed climate, where the motorized R13 doors earn their cost.
HVACQuick $2,049$2,049
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 warranty (15-year warranty on the motor vs 3-year warranty on the motor), value ($446.95 per 1,000 CFM ($1,449, 3,242 CFM) vs $595.64 per 1,000 CFM ($2,049, 3,440 CFM)) and noise (49 dBA at high speed vs 52 dBA at high speed).
- Choose the AirScape Sierra 3400 for efficiency (11.5 CFM per watt vs 8.5 CFM per watt) and damper (R-13 insulated damper vs R-5 insulated damper).
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 | AirScape Sierra 3400 |
|---|---|---|
| Overall rating | 3.8/5 | 3.3/5 |
| Value 30% | 50 $446.95 per 1,000 CFM ($1,449, 3,242 CFM) | 29 $595.64 per 1,000 CFM ($2,049, 3,440 CFM) |
| Efficiency 20% | 58 8.5 CFM per watt | 100 11.5 CFM per watt |
| Noise 15% | 70 49 dBA at high speed | 60 52 dBA at high speed |
| Damper 10% | 33 R-5 insulated damper | 87 R-13 insulated damper |
| Warranty 25% | 100 15-year warranty on the motor | 22 3-year warranty on the motor |
Specifications
| Centric Air 3.4 | AirScape Sierra 3400 | |
|---|---|---|
| Airflow | ||
| Airflow, high speed | 3,242 CFM | 3,440 CFM |
| Power, high speed | 382 W | 298 W |
| Efficiency | 8.5 CFM/W | 11.5 CFM/W |
| Speeds | 2 | 10 |
| Noise | 49 dBA | 52 dBA |
| Install | ||
| Mount | Ducted | Ducted |
| Damper | R-5 insulated | R-13 insulated |
| Ceiling opening | 14 x 26 in | 22.5 x 26.5 in |
| Attic vent area needed | 4 sq ft | 4.6 sq ft |
| Voltage | 120 V | 120 V |
| Remote or wall control | Yes | Yes |
| Warranty | ||
| Warranty | 15 years | 3 years |