You Are Here: Home / Uncategorized / QC STL PRO 5.5
QC STzl PRO 5.5 Stealth Pro Series Whole House Fan Direct Electric Company


5.00 out of 5 based on 1 customer rating
(1 customer review)

The new Stealth Pro Series line of QuietCool fans is an installer-exclusive product. Manufactured with the Energy Saving ECM Motor, they provide substantial energy cost savings. The Stealth series fans are powerful, providing coverage of 1,488-6,035 cubic feet per minute, 750-3,000 square feet and can be installed in various areas of the home. Check out the different Stealth Pro models below to find the best one for you!

SKU: QC STL PRO-5.5 Category:

QuietCool QC STL PRO 5.5

The QC STL PRO 5.5 is the newest, 3 speed, energy saving model of QuietCool whole house fans. The Stealth Pro Series 5.5 best serves homes around 2,800 square feet. If you want a single fan installed in a central hallway then this is the fan for you.  We recommend a multi-fan configuration with the STL PRO 5.5 in the central hallway and one of our lower CFM fans (STL 1.5 or 2.5) in the bedrooms for maximum air flow and flexibility.

General Specifications
Warranty 15 Years
Efficiency Hi: 724 Watts / 7.86 CFM/Watt | Med: 244 Watts /16.59 CFM/Watt

Low: 82 Watts / 33.16 CFM/Watt

Airflow Hi: 5,688 CFM | Med: 4,049 CFM | Low: 2,719 CFM
Sound Level Hi: 50 dB | Med: 43 dB | Low: 41 dB
Attic Requirements 7.6 SQ FT net free area, Fits between 16″ or 24″ on center joists, No framing required
Motor Specifications
Speeds 3
Voltage 120 V. AC, 60Hz
Housing Diameter 20.5″
Housing Length 13.5″
Duct Specifications
Duct Diameter 20″
Duct Length 9′
Damper & Grill
Dampers Barometric Pressurized R-5 Dampers
R-Value R5 (R45 w/ optional winterized insert)
Rough Ceiling Opening 14.25″ x 30.25″
Outside Grill Dimensions 16″ x 32″
Shipping Info
Weight 76 lbs.
Dimensions 42″ x 24″ x 38″
Shipping Cube 16.45
UL Listings
Motor E62815; E62788; E62862
Power Cord ETL 3171583
Handy Box E195978
Acoustic Duct UL 181

Download The Product Sheet For Our Full Inventory Of Whole House Fans

Additional information

Weight 76 kg
Dimensions 107 × 61 × 97 cm
  1. Dilip Patel

    Recently, I had this Pro 5.5″ unit installed in our two stories, 2300 square feet home. I watched the professional installer installing the unit. he said it was very easy to install.

    The unit works very well, it is very quiet at low or medium speed. Even at high speed, the noise is not much noticeable. The unit does a wonderful job of what is designed for. We are very happy that we have Stealth Pro 5.5 on our side. The only regret I have is that I should have this one installed a few years back instead of paying Edison.

Add a review

You may also like…


  • QC STL PRO 6.5