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Manually Adjustable Humidistat for Power Vents

$3389
  • Adjustable humidistat
  • Suitable for all Master Flow brand power attic fans
  • Pre-wired for installation
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Price:
$3389

Product Overview

The GAF Master Flow Adjustable Humidistat is used with all GAF Master Flow power vents. The humidistat helps reduce the likelihood of damaging moisture or heat from accumulating in your attic. Manually adjustable for varying climate conditions.
  • Humidity-activated humidistat can be adapted to accommodate all climate conditions
  • Designed for use with all GAF Master Flow and LL Building Products power vents
  • For use with power ventilators rated not more than 7.5Amps
  • Constructed from galvanized steel for a durable design
  • Manually adjustable setting from Stop to 20% humidity
  • Pre-wired for simple installation

Info & Guides

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Specifications

Dimensions

Product Depth (in.)
5.25
Product Height (in.)
7.75
Product Width (in.)
4.75

Details

Amperage (amps)
7.5
Automatic/Manual
Manual
Color/Finish
Gray
Features
No Additional Features
Material
Galvanized Steel
Product Weight (lb.)
.7
Returnable
90-Day
Voltage (volts)
120

Warranty / Certifications

Manufacturer Warranty
1-year Limited Warranty

Questions & Answers

Typical questions asked about products:

  • Is the product durable?
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  • What are the dimensions of the product?

Customer Reviews

  • 3.9
    out of 23 reviews
  • 86% recommend this product
Filter by:
Showing 1-23 of 23 reviews
IS NOT PRE WIRED !!!!...
IS NOT PRE WIRED !!!!
by
Response from Master FlowSep 27, 2021
Please give us a call at 1-800-211-9612 and we can walk you through properly wiring this unit. MasterFlow
    Rating provided by a verified purchaser...
    Rating provided by a verified purchaser
    by
    • Verified Purchase
    screws protrude out the back, so surface-mount requires considerations. Seems...
    screws protrude out the back, so surface-mount requires considerations. Seems to work fine.
    by
    • Verified Purchase
    Rating provided by a verified purchaser...
    Rating provided by a verified purchaser
    by
    • Verified Purchase
    Hookup is easy and works very well....
    Hookup is easy and works very well.
    by
    • Verified Purchase
    The humidistat works great. It was easy to install...
    The humidistat works great. It was easy to install and it seems to work great.
    by
    • Verified Purchase
    1 person found this helpful
    I installed one of these a couple of weeks ago and subsequently found that it had no variability ...
    I installed one of these a couple of weeks ago and subsequently found that it had no variability as claimed, but is instead frozen at around 40% humidity, which renders it useless for automatically controlling a crawl space vent fan, since the humidity will never get that low to turn the fan off except during the most extreme winter weather. I contacted the vendor's tech support email and got no response. I ordered another one and installed it only to find that the second one had the same problem, except frozen at around 55% - still too low to be useful as an automatic crawl space vent fan controller. In looking over the reviews I see that others are having the same problem. In both cases I tested over a period of hours using a hygrometer to verify ambient humidity, just in case these were some unusually slow reacting humidity sensors. No change of switching point in either case, 40% for the one and 55% for the other, with crawl space humidity readings between 70 and 90%. This is a difficult installation in a shallow crawl space, taking significant chunks out of what paltry bit of free time I have, and it is very frustrating to have to go through the whole thing twice with the result of facing a third installation and tying up more time. I'm going to return them both and will be avoiding this brand going forward.
    by
      1 person found this helpful
      Was used and did not work. Looked new till...
      Was used and did not work. Looked new till you opened it. Extra Holes drilled in bottom with no order and shavings left in. No ground screw. After checking it, was a thermostat but marked as a humidistat. I lost time and money on this for a job. I had to order this.
      by
      • Verified Purchase
      Couldn't get Humidistat to work. No matter what setting fans...
      Couldn't get Humidistat to work. No matter what setting fans would run 24/7 or off 24/7. Master Flo said you need one for each fan. Must not be able to monitor whole crawl space by using one because specs are it can handle a 6.5 amp load. My total load amounted to a little over 2 amp. Used the CMF formula to move air needed in description and using more I'm than double required
      by
      • Verified Purchase
      Does the job...
      Does the job
      by
      • Verified Purchase
      Seema to work O/K, will know better as we get...
      Seema to work O/K, will know better as we get into the heating season.
      by
      • Verified Purchase
      It had to be wired (of course) as shown on...
      It had to be wired (of course) as shown on the side of the device...which was expected. I tested the device with a house foundation vent fan and at the time the fan came on at 40% humidity. I set it at 70%, which was a recommended setting. So, far, it has not detected enough humidity to run the fan.
      by
      • Verified Purchase
      A “plug & play” operation that works perfectly!...
      A “plug & play” operation that works perfectly!
      by
      • Verified Purchase
      Totally ticked. The unit received had clearly been installed before (3 random mounting holes dri...
      Totally ticked. The unit received had clearly been installed before (3 random mounting holes drilled in the bottom), so I bench tested it with my meter in a room I knew was 50% humidity and soon found why they had returned it. DOA. This cost me over $100 in lost time just because the vendor decided to ship me a used unit.
      by
        2 people found this helpful
        Good instructions ...
        Good instructions
        by
        • Verified Purchase
        Works as expected....
        Works as expected.
        by
        • Verified Purchase
        5 Star Review
        Rating provided by a verified purchaser
        by
        • Verified Purchase
        Worked well. The plastic grommet was different from a regular cable clamp but worked fine with th...
        Worked well. The plastic grommet was different from a regular cable clamp but worked fine with the armored cable coming from the motor. Very simple wiring and easy to install.
        by
        • Verified Purchase
        • Recommended
        A "must purchase" for older homes
        This humidistat is a must have accessory for its matching gable mount attic fan which comes only with an adjustable thermostat. Especially in older homes with less or no attic insulation, it is critical to remove humidity which may leak from heated living spaces below into the attic during winter months. Unless this is done, damage to the underside of roofing underlayment will occur and it is conceivable that condensation and melting of ice formed inside the attic on roofing nails protruding through the underlayment will penetrate ceilings and leave water stains. My only issue with this humidistat unit is the wiring diagram stamped on the unit housing. It does not contemplate its use with a thermostat, so if one follows the diagram during installation the thermostat will not turn the fan on at the recommended 105 degrees in the Summer. Oddly, one must call the customer service number for the manufacturer and provide your email address at which they will email you the correct wiring diagram to connect the humidistat to the thermostat and allow them to work together properly. Seems to me it would be easier to just include a small paper insert in the box for either the thermostat or the humidistat to illustrate the combination set-up if you wish to use both units in series rather than the current "need-to-know" system.
        by
        • DIY
        • Verified Purchase
        • Recommended
        7 people found this helpful
        added to newly purchase attic ventilator
        Installation was made by a qualified electrician, but was quite simple. We did call the company to make sure how to properly wire it so the humidistat and thermostat worked separately. The instructions were not included for that. But, it works fine. It's come on several times in the early morning when it's very humid here in the South. I would definitely recommend including this if you install a thermostatically controlled attic ventilator fan.
        by
        • DIY
        • Verified Purchase
        • Recommended
        not many to choose from.
        All that is needed for the application! What else besides t-stat is needed to control attic fan
        by
        • Pro
        • Verified Purchase
        • Recommended
        great product
        Good product, easy to install, may need adjusting to your attic, buy over all OK.
        by
        • Pro
        • Verified Purchase
        • Recommended
        DUAL use!
        Great product! Let's you make DUAL use of your attic fan.
        by
        • DIY
        • Verified Purchase
        • Recommended
        1 person found this helpful
        Showing 1-23 of 23 reviews