The QuietCool CL-5400 whole house fan moves up to 5,462 CFM at around 50 dB, its patented acoustical duct and R5 damper box hanging in the attic to cool homes and grow rooms up to 2,725 sq ft. This ducted whole house fan runs a 2-speed 120 VAC motor for quiet, efficient night-time air exchange.
QuietCool CL-5400 Whole House Fan for Quiet, High-Volume Cooling
The QuietCool CL-5400 whole house fan suspends its motorhead and a patented self-contained acoustical duct from the attic rafters on a barometric R5 damper box, so the vibration that makes standard attic fans intrusive stays overhead. On high it moves 5,462 CFM at 786 W and roughly 50 dB in-room, while low speed holds 3,350 CFM at 512 W and 47 dB. Running on 120 VAC and covering up to 2,725 sq ft at 2 CFM per square foot, it flushes heat and humidity from grow rooms, dry rooms, and whole homes.
Ducted Whole House Fan Built for Simple Retrofits
As a ducted whole house fan, the CL-5400 uses a 20-inch, 9-foot duct and a 14 1/4" x 30 1/4" ceiling opening on 16" or 24" on-center joists with no framing or joist cutting. Growers commonly run it on high after lights-off with windows cracked to pull cool night air across the canopy for free cooling, then step down to low to hold temps, with the R5 dampers limiting backdraft when the fan is off. It wires to an 8-hour electronic timer, a Hi-Low-Off switch, or Wi-Fi smart control (sold separately), and performs best with at least 7.5 sq ft of net free attic venting.
Key Features
- 5,462 CFM two-speed airflow: High and low stages (5,462 / 3,350 CFM) purge peak heat fast, then hold quiet background exchange.
- Quiet ~50 dB operation: The acoustical duct and attic-mounted motor keep in-room sound near 50 dB on high and 47 dB on low.
- Energy-efficient motor: Draws 786 W on high and 512 W on low, supporting free night cooling that eases the AC load.
- Covers up to 2,725 sq ft: Sized for grow rooms, dry rooms, and whole homes at the recommended 2 CFM per square foot.
- No-framing retrofit install: Fits 16" or 24" on-center joists with no framing or joist cutting, using a 14 1/4" x 30 1/4" opening.
- R5 dampers, 10-year warranty: Insulated barometric dampers limit backdraft when idle, backed by a decade of coverage.
Specifications
| Spec | Details |
|---|---|
| Motor Voltage | 120 VAC, 60 Hz |
| Energy Use | Hi: 786 Watts / Low: 512 Watts |
| Air Flow | Hi: 5,462 CFM / Low: 3,350 CFM |
| Square Foot Coverage @ 2 CFM per SQ FT | Up to 2,725 SQ FT |
| Number of Speeds | 2 |
| Duct Diameter | 20" |
| Duct Length | 9 feet |
| Motor Head Diameter | 20 1/2" |
| Motor Head Length | 13 1/2" |
| Sound Level in Room | Hi: 50 dB / Low: 47 dB |
| Dampers | Barometric Pressurized R5 Dampers |
| Controls (not included) | 8-Hour Electronic Timer and Hi-Low-Off Switch or Wi-Fi Smart Control |
| Warranty | 10 Years |
| Framing | None required |
| Joist Cutting | None required; fits 16" or 24" on center |
| Minimum Suggested Attic Venting | 7.5 SQ FT net free area |
| Ceiling Rough Opening | 14 1/4" x 30 1/4" |
| Removable Grille Outside Dimension | 16" x 32" |