QuietCool Classic Whole House Fan QC CL-5400

Quietcool attic fans for whisper-quiet home & grow room cooling

The QC CL-5400 uses a patented, self-contained duct system that hangs in the attic, turning it into one of the quietest Quietcool attic fans available for both living spaces and large indoor grow rooms. By pulling cool outdoor air through open windows and exhausting hot air through the attic, this unit delivers up to 5,462 CFM of airflow while keeping sound levels as low as 47–50 dB inside the room.

Ducted whole house fan for hydroponic climate control

This ducted whole house fan routes airflow through an acoustical duct into an insulated R5 damper box, dramatically reducing noise and vibration—ideal when plants and people share the same building. Growers can use this cool attic whole house fan to flush heat and humidity from hydroponic spaces after lights-off, easing the load on AC systems and helping stabilize temperatures in adjacent rooms, greenhouses, and work areas. With no joist cutting required, a 14 1/4" x 30 1/4" ceiling opening, and a 10-year warranty, the QC CL-5400 is a durable, low-maintenance ventilation upgrade for any hydroponic facility that also needs efficient whole-building cooling.

Key features:

• High CFM for serious heat removal – Up to 5,462 CFM on high to quickly purge built-up heat from large grow rooms, dry rooms, and greenhouses after lights-off.

• Whisper-quiet operation around plants & people – Approx. 47–50 dB in-room thanks to the acoustical duct and attic-mounted motor, so you can ventilate late at night without rattling walls or disturbing tenants/neighbors.

• Ducted design reduces vibration in grow spaces – The motor and fan sit in the attic with a 9 ft, 20" duct, keeping mechanical noise away from sensitive hydroponic environments and minimizing vibration on walls and ceilings.

• Energy-efficient climate control – Two-speed 120V motor (approx. 512–786 W) allows you to pull in cool night air to support “free cooling,” reducing reliance on AC and lowering operating costs for hydroponic facilities.

• Integrated R5 dampers for better environmental control – Barometric, pressurized R5 dampers help limit backdrafts and unwanted air exchange when the fan is off, supporting more stable temps and humidity in nearby grow areas.

• Simple retrofit installation in existing buildings – No framing or joist cutting required; fits 16" or 24" on center joists with a 14 1/4" x 30 1/4" rough opening, making it easy to add powerful ventilation to homes or mixed-use grow properties.

Specifications: