The QUIETCOOL QC-6400 (U.S. Patent #7497774) will help you slash your A/C related electricity costs by 50-90%* and pays for itself faster than any other "green energy" product on the market today.

The QC 6400 draws 6418 CFM (Cubic Feet per Minute) and is the perfect fan for homes with common areas up to 3200 square feet..

Quiet Cool Whole House Fans Quiet Giant QC 6400 D is also known as QC6400D , quiqc6400d

The QUIETCOOL QC-6400 (U.S. Patent #7497774) will help you slash your A/C related electricity costs by 50-90%* and pays for itself faster than any other "green energy" product on the market today.

The QC-6400, new for 2013, is a dual motor design that joins our Classic Line as the most powerful fan QuietCool produces.

Perfect for larger size homes; place a QC-6400 at the top of the stairs, turn both motors on when you come home from work ---- instead of expensive air conditioning ---- and watch your interior home temperature plummet in just minutes.

The QC-6400 joins the rest of the Classic Line featuring the blue powder coated motor housings, shorter motor heads, and a damper box with an R-Value of R-5.

Note: For vertical wall installations, you will need to order a vertical wall adapter (pictured in the last photo under the "Photos" button). This fan uses the 14" x 36" Vertical Wall Adapter (part number: QC-60093).

Specifications

Motor Voltage 120 V. AC, 60 Hz 2 SPEED

Energy Use 658 Watts High Speed/329 Watts Low Speed

Air Flow 6,418 CFM High Speed/3,226 CFM Low Speed

CFM/Watt- Efficiency Rating 9.8

Square Foot Coverage @ 2 CFM per SQ FT Covers up to 3200 SQ FT

# of Speeds 2 Speed

Duct Diameter 16"

Duct Length 6 feet

Motor Head Diameter 16 1/2"

Motor Head Length 13 3/4"

Sound Level in Room "Acoustical" 50 db

R Value at Closed Damper R 5.0

Dampers Air Tight Insulated Dampers

Controls Remote Control or Hard Wire Capabilties

Warranty 10 Years

Framing None Required

Fits between "16 or 24" on Center Joists No Joist Cutting Necessary

Minimum Suggested Attic Venting 8.5 SQ FT net free area

Ceiling Rough Opening 14 1/4" X 36 1/4"

Ceiling Grill Outside Dimension 16" x 38"

Ceiling Grill Color White- High Volume Air Flow

Shipping Weight87 Lbs.

Ship Carton Dimensions 39" x 20" x 38"

Ship Carton Cube 14.9

UL Component UL Listing Numbers

Motor E62815; E62788; E62862

Power Cord E55178; E147323

RACO Handy Box & Cover E195978