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Stealth Pro X Series Whole House Fan

The Stealth Pro X is the second line in the Pro series. 

The models’ CFM range and speed options are similar to the Trident Pro X series. 


The major component that separates the Stealth Pro X series from the Trident Pro X 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 X 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 X is the answer you have been looking for!

Stealth Pro X Fan Features

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Innovated and Patented Design

The QuietCool Stealth Pro X whole house fan features the patented, self-contained duct system that hangs in the attic to help neutralize any noise vibrations. The result is the ability to use the system at any time without sound disturbance.

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R5 Insulated Damper System

The included damper system features barometric pressurized gravity dampers that ensure there will be no heating/cooling loss between the home and attic. Compare this to traditional whole house fans that have old-style shutters with zero R-Value and it is not quite close.

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Electronically Commutated AC/DC Brushless Motor

All QuietCool Stealth Pro X Series fans include our ultra-high efficiency electronically commutated AC/DC brushless motors. Known as “ECM” motors, these motors offer ultra-high efficiency with very high CFM/Watt ratios. All Stealth Pro X fans operate on low wattage and low amperage. These motors are so efficient that they can help homeowners slash their A/C related electricity costs by up to 50-90%.

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Industry Leading Warranty

QuietCool offers an industry leading 15‐year warranty. With QuietCool, you will have the confidence that your fan will be operating at its fullest potential for a decade, or more likely, even longer! And if by some chance it breaks during that decade, you will know that you are completely covered on any parts that make up your QuietCool fan motor assembly.

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98% Customer Satisfaction

QuietCool enjoys 98% total customer satisfaction. Enjoy peace of mind from thousands of satisfied QuietCool customers.

Stealth Pro X Models

STL PRO-1.5X

Motor Voltage: 120 VAC, 60 Hz

Energy Use: 66.7 Watts

Air Flow: 1479 CFM

Recommended SQFT Coverage @2CFM per SQFT: Covers up to 740 SQFT

Number of Speeds: 1

Controls: Included 8 Hour Electronic Timer

Warranty: 15 Years

Minimum Suggested Attic Venting: 1.98 SQFT net free area

STL PRO-2.5X

Motor Voltage: 120 VAC, 60 Hz

Energy Use: Hi: 157 Watts / Low: 82.3 Watts

Air Flow: Hi: 2541 CFM / Low: 2018 CFM

Recommended SQFT Coverage @2CFM per SQFT: Covers up to 1280 SQFT

Number of Speeds: 2

Controls: Included 8 Hour Electronic Timer and HI-LOW-OFF Switch

Warranty: 15 Years

Minimum Suggested Attic Venting: 3.39 SQFT net free area

STL PRO-3.3X

Motor Voltage: 120 VAC, 60 Hz

Energy Use: Hi: 264 Watts / Low: 74.6 Watts

Air Flow: Hi: 3159 CFM / Low: 1980 CFM

Recommended SQFT Coverage @2CFM per SQFT: Covers up to 1580 SQFT

Number of Speeds: 2

Controls: Included 8 Hour Electronic Timer and HI-LOW-OFF Switch

Warranty: 15 Years

Minimum Suggested Attic Venting: 4.22 SQFT net free area

STL PRO-4.8X

Motor Voltage: 120 VAC, 60 Hz

Energy Use: Hi: 408 Watts / Med: 225 Watts / Low: 73.9 Watts

Air Flow: Hi: 4280 CFM / Med: 3500 CFM / Low: 2361 CFM

Recommended SQFT Coverage @2CFM per SQFT: Covers up to 2140 SQFT

Number of Speeds: 3

Controls: Included 8 Hour Electronic Timer and HI-LOW-OFF Switch

Warranty: 15 Years

Minimum Suggested Attic Venting: 5.71 SQFT net free area

STL PRO-5.5X

Motor Voltage: 120 VAC, 60 Hz

Energy Use: Hi: 490 Watts / Med: 268 Watts / Low: 88 Watts

Air Flow: Hi: 5044 CFM / Med: 4238 CFM / Low: 2870 CFM

Recommended SQFT Coverage @2CFM per SQFT: Covers up to 2530 SQFT

Number of Speeds: 3

Controls: Included 8 Hour Electronic Timer and HI-LOW-OFF Switch

Warranty: 15 Years

Minimum Suggested Attic Venting: 6.73 SQFT net free area

STL PRO-6.0X

Motor Voltage: 120 VAC, 60 Hz

Energy Use: Hi: 462 Watts / Med: 210 Watts / Low: 113 Watts

Air Flow: Hi: 5587 CFM / Med: 4262 CFM / Low: 3428 CFM

Recommended SQFT Coverage @2CFM per SQFT: Covers up to 2800 SQFT

Number of Speeds: 3

Controls: Included 8 Hour Electronic Timer and HI-LOW-OFF Switch

Warranty: 15 Years

Minimum Suggested Attic Venting: 7.45 SQFT net free area

STL PRO-7.0X

Motor Voltage: 120 VAC, 60 Hz

Energy Use: Hi: 725 Watts / Med: 319 Watts / Low: 166 Watts

Air Flow: Hi: 6996 CFM / Med: 5448 CFM / Low: 4308 CFM

Recommended SQFT Coverage @2CFM per SQFT: Covers up to 3500 SQFT

Number of Speeds: 3

Controls: Included 8 Hour Electronic Timer and HI-LOW-OFF Switch

Warranty: 15 Years

Minimum Suggested Attic Venting: 9.33 SQFT net free area