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quiet giant qc 4500
The Quiet Giant
The Whisper Quiet Whole House Fan Cooling System The Quiet Giant whole house fan is a powerful 4,534 CFM, 2 speed whole house fan.

This revolutionary new product is the perfect addition to the current line of QC CL-2250 whole house fans.

The Quiet Giant can be used to create a powerful, yet amazingly quiet flow of air in your home.

Used alone or in combination with the other QuietCool fans, these amazing fans will give you unprecedented flexibility in designing the perfect whole house cooling solution to meet your specific needs.

The Quiet Giant is mounted in the attic and connects to an attractive ceiling grill with 2 patented acoustical insulated ducts. This unique design helps to eliminates all vibration, rattle, and noise, common to all other whole house fans.

The Quiet Giant consist of basically two of our QC CL-2250 units, but with larger, higher speed motors. The two fans each come with 6 foot long ducting that connected to one ceiling box and one ceiling grill for simple installation. The ceiling box is 14 1/4"x 36 1/4.

Each motor has insulated, positive closing damper doors that prevent the intrusion of attic air back into the house when they are not in operation.

The Quiet Giant is ideal for customers who want a single fan installed in a central hallway or it can be used in a multi-fan configuration, by installing the Quiet Giant in the central hallway and installing our smaller cfm QC fans in the bedrooms for maximum air flow and flexibility.

When you compare the price per CFM and the amazingly low noise levels of the QuietCool fans, you will find that our fans are in a class of their own. ORDER YOURS TODAY!

Browse our full list of QuietCool Products and start saving money today!

two whole house fans in one
    Quiet Giant Features:
  • Powerful 4,534 CFM
  • Two Separate Motors For 2 Speed Operation
  • One Ceiling Box For Easy Installation
  • Motor Made in The USA

What's In The Box? When you purchase a fan from us, you get a complete system, which includes the fan, ducting, damper and grille. All that it needed for installation is your choice of controls. All of the "Classic Line" fans (except for the QC-1500) have the optional capability of having the motors being wired for two speeds. For two speed operation, your installer would need to simply remove the included 8' power cord and run a 3rd wire from the fan motor to the 3-wire wall switch and timer. If using a remote system or standard on/off wall switch, the fan will work perfectly as a single speed fan (as set in the factory). Consult with your electrician about wiring this 2 speed wiring option. This 2 speed option would actually make our dual motor QC-4500 and QC-6400 fans 4 speed capable because these fans have two motors per fan.

The ideal setup for automatic operation, is to have your electrician hardwire the fan to a wall timer and standard off/on or 3 way switch (if wired for 2 speed operation) mounted next to each other on the wall at a central location such as a common hallway. This allows you to turn the fans off based on the time set on the timer or put the timer on hold and use the multiple wall switches to operate your fans individually. This method of installation gives your the flexibility of operating one or more fans during cooler months when you may not want all of your fans running at the same time.

For those that plan on mounting the fan grille on a side wall instead of the ceiling, (often done on a room with a vaulted ceiling), you will need one optional wall adaptor per fan.


Cools Up To 2,500 square feet
QC-4500D Order Fans And Multi- Fan Packages Online - Free Shipping (Excl. HI & AK):

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The Quiet Giant Whole House Fan is a system that works to cool your house by exhausting large volumes of hot air when the outside air is cooler.

QC-4500 Specification Sheetattic fan manual

QC CL-4500 Specifications: Motor Voltage 120 V. AC, 60 Hz 2 SPEED Capable Per Motor
Energy Use 504 Watts High Speed/249 Watts Low Speed
Air Flow 4,534 CFM High Speed/2457 CFM Low Speed
CFM/Watt- Efficiency Rating 8.99 high / 9.87 low
Square Foot Coverage @ 2 CFM per SQ FT Covers up to 2350 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" 47 high db / 44 low 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 6 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 Weight 81 Lbs.
Ship Carton Dimensions 39" x 20" x 38"
Ship Carton Cube 17.1
UL Component UL Listing Numbers Motor E62815; E62788; E62862 Power Cord E55178; E147323 RACO Handy Box & Cover E195978