© 2000 by Whole House Fan Installers

Stealth Pro Series Whole House Fan

The Stealth Pro is the second line in our Pro series. These units are only available through an authorized wholesalers and licensed contractor. The models’ CFM range and speed options are similar to the Trident Pro series, along with the controls also being included in the box. The major component that separates the Stealth Pro series from the Trident series is the electronically commutated (ECM) AC/DC brushless motor. These motors are breaking new ground in the world of whole house fans! The motor contains a microchip that allows the motor to cycle from alternating current, to direct current. This is what has homeowners so excited and allows the incredible energy savings! Another great benefit of this “brushless” motor is there are less moving parts, which translates to fewer parts at risk of being damaged. The Stealth Pro series also comes with an industry leading 15-year motor warranty! If reducing your energy footprint by the largest margin is your main focus, or if you are looking to save the most money, then the Stealth Pro is the answer you have been looking for!

QC-STL PRO 1.5X

The QC-STL PRO 1.5 is the smallest whole house fan that Quiet Cool offers. It is mostly used as an add on fan for a multi zoned system. 

120 VAC, 60 Hz Motor Voltage 

66.7 Watts Energy Use 

1479 CFM Air Flow

1040 CFM HVI-916 Airflow (for CA Title 24 New Construction)  

Covers up to 740 SQ FT (Recommended SQFT Coverage @ 2 CFM per SQ FT) 

1 Speed

14"Duct Diameter

6' Duct Length

14-1/2" Motor Head Diameter

3-1/2" Motor Head Length 1

Barometric Pressurized R5 Dampers

8 Hour Electronic Timer Controls

15 year Warranty

No Framing required 

No Joist Cutting Required; fits 16” or 24” on center

1.98 SQ FT net free area of Minimum Suggested Attic Venting

14 1/4” x 14 1/4” Ceiling Rough Opening

16” x 16” Removable Grille Outside Dimension

43 lbs Shipping Weight

20” x 20” x 38” Box Dimensions

In The Box: 

-QC STL PRO-1.5X Motorhead -Damper Box
-Removable Grille -6 Foot Duct
-Cut-out Template -Accessory Bag
-Window Locks -Controls

QC STL PRO 2.5X

120 VAC, 60 Hz Motor Voltage
Hi: 157 Watts / Low: 82.3 Watts Energy Use
Hi: 2541 CFM / Low: 2018 CFM Air Flow
1920 CFM HVI-916 Airflow (for CA Title 24 New Construction)
Covers up to 1280 SQ FT (Recommended SQFT Coverage @ 2 CFM per SQ FT)
2 Speeds
16" Duct Diameter
6' Duct Length
16-1/2" Motor Head Diameter
13-1/2" Motor Head Length
Barometric Pressurized R5 Dampers
8 Hour Electronic Timer and
HI-LOW-OFF switch Controls (Not Included)
15 Year Warranty
No Framing
No Joist Cutting
3.39 SQ FT net free area Minimum Suggested Attic Venting
14 1/4” x 18 1/4” Ceiling Rough Opening
16” x 20” Removable Grille Outside Dimension
49 lbs. Shipping Weight
24” x 20” x 38” Box Dimensions
In The Box:

-QC STL PRO-2.5X Motorhead -Damper Box
-Removable Grille -6 Foot Duct
-Cut-out Template -Accessory Bag
-Window Locks -Controls

QC STL PRO 3.3X

​120 VAC, 60 Hz Motor Voltage
Hi: 264 Watts / Low: 74.6 Watts  Energy Use
Hi: 3159 CFM / Low: 1980 CF Air Flow
2350 CFM HVI-916 Airflow (for CA Title 24 New Construction)
Covers up to 1580 SQ FT  (Recommended SQFT Coverage @ 2 CFM per SQ FT)
2 Speeds
16" Duct Diameter
6' Duct Length
16-1/2" Motor Head Diameter
13-1/2" Motor Head Length
Barometric Pressurized R5 Dampers
8 Hour Electronic Timer andHI-LOW-OFF switch Controls 
15 Year Warranty
No Framing
No Joist Cutting
4.22 SQ FT net free area  Minimum Suggested Attic Venting
14 1/4” x 22 1/4” Ceiling Rough Opening
16” x 24” Removable Grille Outside Dimension
55 lbs. Shipping Weight
24” x 20” x 38” Box Dimensions
In The Box:

-QC STL PRO-3.3X Motorhead

-Damper Box -Removable Grille  

-6 Foot Duct -Cut-out Template  

-Accessory Bag -Window Locks   -Controls

QC STL PRO 4.8X

​120 VAC, 60 Hz Motor Voltage
Hi: 408 Watts / Med: 225 Watts / Low: 73.9 Watts  Energy Use
Hi:4280 CFM / Med:3500 CFM / Low:2361 CFM  Air Flow
3130 CFM HVI-916 Airflow (for CA Title 24 New Construction)
Covers up to 2140 SQ FT (Recommended SQFT Coverage @ 2 CFM per SQ FT)
3 Speeds
18" Duct Diameter
9' Duct Length
18-1/2" Motor Head Diameter
13-1/2" Motor Head Length
Barometric Pressurized R5 Dampers
8 Hour Electronic Timer and HI-LOW-OFF switch Controls 
15 Year Warranty
No Framing
No Joist Cutting
5.71 SQ FT net free area  Minimum Suggested Attic Venting
14 1/4” x 30 1/4”  Ceiling Rough Opening
16” x 32” Removable Grille Outside Dimension
75 lbs. Shipping Weight
36” x 22” x 40” Box Dimensions
In The Box:

-QC STL PRO-4.8X Motorhead -Damper Box
-Removable Grille -6 Foot Duct
-Cut-out Template -Accessory Bag
-Window Locks -Controls

QC STL PRO 5.5X

120 VAC, 60 Hz Motor Voltage
Hi: 490 Watts / Med: 268 Watts / Low: 88 Watts  Energy Use
Hi:5044 CFM / Med:4238 CFM / Low:2870 CFM  Air Flow
3750 CFM HVI-916 Airflow (for CA Title 24 New Construction)
Covers up to 2530 SQ FT  (Recommended SQFT Coverage @ 2 CFM per SQ FT)
3 Speeds
20" Duct Diameter
9' Duct Length
20-1/2" Motor Head Diameter
13-1/2" Motor Head Length
Barometric Pressurized R5 Dampers
8 Hour Electronic Timer and HI-LOW-OFF switch Controls 
15 Year Warranty
No Framing
No Joist Cutting
6.73 SQ FT net free area Minimum Suggested Attic Venting
14 1/4” x 30 1/4” Ceiling Rough Opening
16” x 32” Removable Grille Outside Dimension
97 lbs. Shipping Weight
39” x 24” x 39” Box Dimensions
In The Box:

-QC STL PRO-5.5X Motorhead  -Damper Box
-Removable Grille -6 Foot Duct
-Cut-out Template -Accessory Bag
-Window Locks -Controls

QC STL PRO 6.0X

​120 VAC, 60 Hz Motor Voltage
Hi: 462 Watts / Med: 210 Watts / Low: 113 Watts   Energy Use
Hi:5587 CFM / Med:4262 CFM / Low:3428 CFM  Air Flow
4030 CFM HVI-916 Airflow (for CA Title 24 New Construction)
Covers up to 2800 SQ FT  (Recommended SQFT Coverage @ 2 CFM per SQ FT)
3 Speeds
22" Duct Diameter
9' Duct Length
22-1/2" Motor Head Diameter
13-1/2" Motor Head Length
Barometric Pressurized R5 Dampers
8 Hour Electronic Timer and HI-LOW-OFF switch Controls 
15 Year Warranty
No Framing
No Joist Cutting
7.45 SQ FT net free area Minimum Suggested Attic Venting
14 1/4” x 36 1/4” Ceiling Rough Opening
16” x 38” Removable Grille Outside Dimension
97 lbs. Shipping Weight
41” x 26” x 39” Box Dimensions
In The Box:

-QC STL PRO-6.0X Motorhead   -Damper Box
-Removable Grille -6 Foot Duct
-Cut-out Template -Accessory Bag
-Window Locks -Controls

QC STL PRO 7.0X

​120 VAC, 60 Hz Motor Voltage
Hi: 725 Watts / Med: 319 Watts / Low: 166 Watt Energy Use
Hi:6996 CFM / Med:5448 CFM / Low:4308 CFM Air Flow
5200 CFM HVI-916 Airflow (for CA Title 24 New Construction)
Covers up to 3500 SQ FT (Recommended SQFT Coverage @ 2 CFM per SQ FT)
3 Speeds
24" Duct Diameter
9' Duct Length
24-1/2" Motor Head Diameter
13-1/2" Motor Head Length
Barometric Pressurized R5 Dampers
8 Hour Electronic Timer and
HI-LOW-OFF switch Controls (Not Included)
15 Year Warranty
No Framing
No Joist Cutting
9.33 SQ FT net free area Minimum Suggested Attic Venting
14 1/4” x 36 1/4” Ceiling Rough Opening
16” x 38” Removable Grille Outside Dimension
108 lbs. Shipping Weight
41” x 28” x 39” Box Dimensions
In The Box:

-QC STL PRO-7.0X Motorhead  -Damper Box
-Removable Grille -6 Foot Duct
-Cut-out Template -Accessory Bag
-Window Locks -Controls

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