Internet #205596234

Model #SLRHT1

Manually Adjustable Humidistat/Thermostat Control for PGSOLAR/PRSOLAR Series Vents

Questions & Answers (4)
  • Adjustable humidistat/thermostat for MF Solar-Powered Attic Vents
  • Works with Master Flow PGSOLAR, PRSOLAR and ERVSOLAR series vents
  • Pre-wired for easy installation
  • See More Details

Frequently Bought Together


Product Overview

More homes and businesses in the U.S. are protected by a GAF roof than by any other product. We are the leading roofing manufacturer in North America.

Nothing protects quite like a roof.

Nothing protects quite like a roof. That's why millions of Americans live, work, and play under quality products from North America's largest roofing manufacturer - GAF.

Always have a balanced ventilation system. The amount of exhaust ventilation should always be equal the amount of intake ventilation.

How much Ventilation do I need?

Include 1 sq. ft. of attic ventilation, evenly split between intake and exhaust, for every 300 sq. ft. of attic floor space.

Choosing the right attic ventilation for your home is very important. GAF offers a great selection of Master Flow and Cobra products.

What type of Ventilation do I need?

Review the ventilation options below to determine the best fit for your home application.

Available in both roof mount and gable mount, power attic vents exhaust the greatest volume of hot and/or humid air from the attic.

High efficiency Electric, Solar or Hybrid

Quickly removes large volumes of heat and moisture from your attic.

Cooler external air enters through vents lower on the eaves or soffits that “pushes” the hot/moist attic air out of the vents higher on the roof.

No electricity required

Allows excess heat and moisture to escape your attic without the need for electric hook-up.

Wind Turbines utilize the wind to pull heat and moisture from your attic and acts as a static exhaust vent when wind is still.

Wind-powered, smooth, and quiet operation

Utilizes the wind to pull heat and moisture from attic; acts as a static exhaust vent when wind is still.

Located at the lowest part of the roof, intake vents are a critical part of the attic ventilation system, allowing fresh air to flow into the attic

The most overlooked and critical part of attic ventilation

Allows cooler, fresh air to enter the attic at/near the soffits driving heat and moisture out higher exhaust vents.

Your home offers warning signs when your attic isn’t properly ventilated. You may recognize some of these signs in your own home.

5 Warning Signs

Here are some poor attic ventilation warning signs that you may recognize:

A possible cause of higher cooling costs could be insufficient attic ventilation, requiring the cooling system to run excessively.

1. Increased energy costs

Excess attic heat can cause your cooling system to work harder, raising your energy costs.

If you see that your shingles are dry or breaking, that could mean you have inadequate attic ventilation or you may need a new roof

2. Curling/cracking shingles

Inadequate ventilation can cause your roof shingles to curl and crack.

Moisture in the attic can become trapped and condense on rafters and insulation if not insulated properly. This can potentially increase energy costs

3. Roof decking moisture

Excess attic moisture can drip into attic insulation reducing effectiveness, even damaging ceilings below.

Stains or mold growth inside your home may be caused by inadequate attic ventilation. Excessive moisture in the attic allows mold and mildew to thrive

4. Attic mold/mildew

Excessive moisture can cause dangerous mold and mildew causing additional concerns.

Ice damming can cause water to enter the attic and house if you don’t have an adequate shingle underlayment or if the flashing has deteriorated.

5. Winter ice dams

Ice dams can cause expensive leaks and damage in attics, as well as living spaces.

The GAF Master Flow adjustable Humidistat/Thermostat Combo unit works with GAF Master Flow PGSOLAR or PRSOLAR “Green Machine” series vent. The humidistat/thermostat combo helps control-damaging moisture and reduces heat accumulation in your attic. It is fully adjustable for varying climates and is only operational during daylight hours.
  • Add adjustable humidistat/thermostat to PRSOLAR or PGSOLAR models
  • Helps reduce the likelihood of damaging moisture or heat accumulation in your attic
  • Designed for use with GAF Master Flow PG/PRSOLAR roof vents
  • Fully adjustable to accommodate varying climates
  • Pre-wired with a simple molded plugs for easy installation
  • Replacement control unit for the PRSOLAR2
  • Operational during daylight hours only
  • For use with ALL GAF Master Flow solar units manufactured after December 2012

Info & Guides

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Product Depth (in.)
Product Height (in.)
Product Width (in.)


Color/Finish Family
Thermostat Controlled
Galvanized Steel
Product Weight (lb.)

Warranty / Certifications

Manufacturer Warranty
1-year Limited

Questions & Answers


Can this device be used with the SLRT1 dual control unit?

Asked by Mike June 2, 2018

Just talked to Master Flow and they said it wouldn't work with the older SLRT1 Model, but it would work on the newer SLRHT1 Model which is newer, cheaper, and controls humidity and temperature.

Will this unit also work on a 12 Volt solar fan, or just a 24 Volt fan?

Asked by David August 28, 2017

This is for use with Master Flow Solar Attic Fans only. Only for use with the 24 volt motor. If you have any other inquiries about our Master Flow products please call Technical Services at 800-211-9612.

how many vents will it control

Asked by bruce August 31, 2015

Thank you for contacting MasterFlow ... The PT6 thermostat is designed to operate one device. Please call Technical Services Group at 800-211-9612.

Running too often

Asked by Gary January 6, 2016

Thank you for contacting MasterFlow ... We recommend a humidity setting of 70%. The 60% setting may be causing the device to operate longer than desired. When set at 60%, the fan will operate until the attic humidity is below 60%. Please call Technical Services at 800-211-9612, M-F 8A-5P ET, with any additional questions.

Customer Reviews

  • 1 Customer Reviews
  • 4 out of 5 stars overall
0% of customers recommended.
Overall Ratings
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Denver, CO
Works okay, but overpriced
Quality :
Value :
These seem to do the job, but the quality of the manufacturing is pretty low. The temp and humidity adjusters barely even line up with the holes in the housing. Additionally, they were just in the box with some paper with no literature at all. You just have to guess whether the temperature and humidity settings work together or independently and how to set them.
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