QuietCool ES-5400 Whole House Fan 120V | 5,422 CFM 2-Speed Ducted Attic Fan

The QuietCool ES-5400 whole house fan moves up to 5,422 CFM at just 50 dB on high, using a patented attic-hung ducted design to cool homes and grow rooms up to 2,700 sq ft without the noise of a standard attic fan. This ducted whole house fan runs a 2-speed motor that drops to 82 W and 41 dB on low for quiet overnight air exchange. QuietCool ES-5400 Whole House Fan Tuned for Quiet, High-Volume Cooling The QuietCool ES-5400 whole house fan hangs its motorhead and a patented self-contained duct in the attic, tied to a barometric R5 damper box, so the vibration and hum that make ordinary electric attic fans intrusive stay out of the room below. On high it moves 5,422 CFM at 728 W and a measured 50 dB, while low speed settles to 2,719 CFM at just 82 W and 41 dB. Running on 120 VAC and covering up to 2,700 sq ft at 2 CFM per square foot, it clears heat from a home or grow room faster than most in-room fans without adding an AC-sized power draw. Ducted Whole House Fan That Installs Without Framing As a ducted whole house fan, the ES-5400 uses a 20-inch, 9-foot duct and drops into a 14 1/4" x 30 1/4" ceiling opening on 16" or 24" on-center joists with no framing or joist cutting. Growers usually run it on high after lights-out with a couple of windows cracked to pull cool night air across the canopy, then switch to low once room temps level off, letting the R5 dampers seal the ceiling against attic air when the fan is off. It ships with the motorhead, damper box, ceiling grille, 9-foot duct, cut-out template, accessory bag, and window locks, and wires to an 8-hour electronic timer, double 3-way switch, or Wi-Fi smart control (sold separately). A minimum of 7.6 sq ft of net free attic venting keeps airflow efficient. Key Features Quiet 50 dB ducted operation: The patented duct and attic-mounted motor hold sound to 50 dB on high and 41 dB on low, so ventilation runs through dark cycles without stressing plants or sleep. 5,422 CFM two-speed airflow: High and low stages (5,422 / 2,719 CFM) let you clear peak heat fast, then settle into quiet background circulation. Energy-efficient two-speed motor: Pulls 728 W on high and just 82 W on low, giving growers an efficient alternative or complement to AC. No-framing retrofit install: Fits 16" or 24" on-center joists with no framing or joist cutting, using the included cut-out template for a 14 1/4" x 30 1/4" opening. R5 barometric dampers: Insulated damper doors seal the ceiling against attic air when the fan is off, limiting heat transfer in cooler months. Complete kit, 10-year warranty: Ships with motorhead, damper box, grille, 9-foot duct, template, accessory bag, and window locks, backed by a decade of coverage. Specifications Spec Details Motor Voltage 120 VAC, 60 Hz Energy Use High: 728 W / Low: 82 W Air Flow High: 5,422 CFM / Low: 2,719 CFM Square Foot Coverage Up to 2,700 sq ft @ 2 CFM per 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 High: 50 dB / Low: 41 dB Dampers Barometric pressurized R5 dampers Controls (not included) 8-hour electronic timer, double 3-way 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 7.6 sq ft net free area Ceiling Rough Opening 14 1/4" x 30 1/4" Removable Grille Outside Dimension 16" x 32" In the Box QC ES-5400 motorhead, damper box, ceiling grille, 9-foot duct, cut-out template, accessory bag, window locks