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
The AirScape Sierra 3400 is the better whole house fan overall, rated 3.3 to 3.2. The AirScape Sierra 3400 leads on damper. The AirScape Ventura 3400 wins on value. The AirScape Ventura 3400 costs $490 less ($1,559 vs $2,049).
AirScape Ventura 3400
A ten-speed ducted fan for a typical home in a mild climate; the uninsulated door makes it a poor fit where winters are cold.
HVACQuick $1,559$1,559
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 AirScape Sierra 3400 for damper (R-13 insulated damper vs uninsulated louver).
- Choose the AirScape Ventura 3400 for value ($466.49 per 1,000 CFM ($1,559, 3,342 CFM) vs $595.64 per 1,000 CFM ($2,049, 3,440 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 | AirScape Sierra 3400 | AirScape Ventura 3400 |
|---|---|---|
| Overall rating | 3.3/5 | 3.2/5 |
| Value 30% | 29 $595.64 per 1,000 CFM ($2,049, 3,440 CFM) | 47 $466.49 per 1,000 CFM ($1,559, 3,342 CFM) |
| Efficiency 20% | 100 11.5 CFM per watt | 100 11.4 CFM per watt |
| Noise 15% | 60 52 dBA at high speed | 60 52 dBA at high speed |
| Damper 10% | 87 R-13 insulated damper | 0 uninsulated louver |
| Warranty 25% | 22 3-year warranty on the motor | 22 3-year warranty on the motor |
Specifications
| AirScape Sierra 3400 | AirScape Ventura 3400 | |
|---|---|---|
| Airflow | ||
| Airflow, high speed | 3,440 CFM | 3,342 CFM |
| Power, high speed | 298 W | 292 W |
| Efficiency | 11.5 CFM/W | 11.4 CFM/W |
| Speeds | 10 | 10 |
| Noise | 52 dBA | 52 dBA |
| Install | ||
| Mount | Ducted | Ducted |
| Damper | R-13 insulated | Uninsulated |
| Ceiling opening | 22.5 x 26.5 in | 22.5 x 26.5 in |
| Attic vent area needed | 4.6 sq ft | 4.6 sq ft |
| Voltage | 120 V | 120 V |
| Remote or wall control | Yes | Yes |
| Warranty | ||
| Warranty | 3 years | 3 years |