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Internet # 302778594

Model # ERV4BR

1000 CFM Brown Power Roof Mount Attic Fan

$205.76
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  • Attic fan helps cool up to 1,600 sq. ft. of attic space
  • Compact fan size with hemmed dome for a sleek look
  • High efficiency attic fan motor with adjustable thermostat
  • View More Details

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Product Details

About This Product

The GAF Master Flow ERV4 Power Roof Vent is a great overall investment in attic ventilation. This attic vent can quickly remove a larger volume of hot and/or humid air from your attic when compared to static ventilation. This in turn can help save money on your heating and cooling costs. The ERV4 model Power Roof Mount Vent can move air at a rate of up to 1000 cu. ft. per minute. It is designed for attic spaces up to 1600 sq. ft.

Highlights

  • Energy efficient uses up to 55% less electricity than typical competitor's vents (based on GAF testing at 120-Volt)
  • Helps reduce energy costs and helps prolong the life of the roof and shingles
  • Galvanized steel construction for durability
  • Excellent for roof slopes 3:12 to 12:12
  • Heavy-duty internal screen helps prevent animal infestation
  • UL Listed
  • Miami-Dade County Product Control approved, State of Florida approved, and meets or exceeds the requirements of Texas Department of Insurance
  • Optional humidistat available (H1) - sold separately
  • Return Policy

Product Information

Internet # 302778594

Model # ERV4BR

Specifications

Dimensions

Coverage Area (Sq.Ft)

1600

Cut-Out Diameter (in.)

15

Net-Free Area (Sq. In.)

720

Product Height (in.)

9 in

Product Width (in.)

25 in

Rough Opening Height (in.)

15 in

Rough Opening Width (in.)

15 in

Details

Airflow (CFM)

1000

Color Family

Brown

Color/Finish

Brown

Features

Adjustable Thermostat, Paintable, Thermostat Controlled

Intake/Exhaust

Exhaust

Material

Galvanized Steel

Mounting Position

Roof Mount

Power Type

Electric Powered

Recommended Sq. Ft.

1600

Returnable

90-Day

Ventilation Type

Roof

Voltage (V)

120 V

Wattage (watts)

108

Warranty / Certifications

Manufacturer Warranty

5-year Limited Parts/2-year Labor Warranty

Questions & Answers

How do i measure square footage of attic? Have a cape style home.
ByMay 21, 2026
1 Answer | 
Answer This Question

"Floor" space of the attic is typically used for the square footage.

By|May 21, 2026


    Can you adjust the temperature
    ByMay 5, 2026
    1 Answer | 
    Answer This Question

    Yes, this model includes an adjustable thermostat.

    By|May 5, 2026


      I had a roofer install my 2 1250 CFM Blk power roof mount attic fans that i purchased from home depot. 1 is very quiet the other is making a loud vibrating sound. This has been installed for less than a month.
      ByJul 30, 2025
      1 Answer | 
      Answer This Question

      The ERV5 attic fan, which operates at 1250 CFMs, is designed to ventilate an attic space of up to 2200 square feet. Each fan requires 600 square inches of NFA Intake to function correctly. Please note that oversizing the attic fan could lead to excessive vibrations and premature motor burnout.

      By|Jul 30, 2025


        How many amps does fan pull
        ByJun 27, 2025
        1 Answer | 
        Answer This Question

        This has a 1.35 amp motor. If you have any other questions about Master Flow products, please email MasterFlowTech@gaf.com

        By|Jun 28, 2025


          What diameter hole in roof does it need
          ByApr 11, 2025
          1 Answer | 
          Answer This Question

          The Master Flow ERV Series, Roof Mount Attic Fans use a 15 inch diameter hole. If you have any other questions about Master Flow products please email MasterFlowTech@gaf.com

          By|Apr 15, 2025


            How many blades does it have
            ByApr 11, 2025
            1 Answer | 
            Answer This Question

            The ERV4 Series Attic Fan has a 14" diameter 5 fin Blade. If you have any other questions about Master Flow products please email MasterFlowTech@gaf.com

            By|Apr 15, 2025


              What is the decible rating
              BySep 2, 2024
              1 Answer | 
              Answer This Question

              The ERV models do not have a rating, the previous version, the PR series were rated at 44 decibles.

              By|Sep 3, 2024


                Can you add a humidistat to this? Like I know I’ll have to do the wiring but it shouldn’t be an issue to add it to the system?
                ByJul 16, 2024
                1 Answer | 
                Answer This Question

                Yes you can add the H1 humidistat. If you have any questions about Master Flow products please email MasterFlowTech@gaf.com

                By|Jul 17, 2024


                  Viewing 1-8 of 94

                  Customer Reviews

                  4.5 out of 5

                  • 4.5 out of 220 reviews
                  • 92% recommend this product
                  Filter by:
                  Showing 1-10 of 220 reviews
                  I've had this fan installed for over a month and I am very satisfied with the performance. It makes the upstairs of the house much more bearable in the summer months, and the A/C unit doesn't have to work as hard.
                  by
                  Response from Master FlowAug 25, 2026
                  Happy to hear that you are satisfied with our product and thank you for your feedback. If you have any other inquiries about our Master Flow products please email, masterflowtech@gaf.com MasterFlow
                  I bought this unit to replace the old one which lasted about 10 years built with the home. This n...
                  I bought this unit to replace the old one which lasted about 10 years built with the home. This new one lasted less that 2 years and started squealing a LOT. Neighbors noticed how loud it was so time to replace it again. Really with it would have lasted a bit longer.
                  by
                    3 found this review helpful
                    I bought this fan about 2 years ago and installed it back in winter in 2016. It was too hot i the...
                    I bought this fan about 2 years ago and installed it back in winter in 2016. It was too hot i the attic to do it in summer. When me and my wife moved into our new house, I put the remote thermostat in the attic. The house was newly built, and had attic insulation "blown" in. It was really good at holding in heat during winter and keeping the attic somewhat cool. The house we were renting was old, had worn down and flattened "Pink Panther" insulation. It was horrible. Our electric bills were about $200 a month during summer when we lived there. I put in a gable mounted fan, and it dropped our bills down to about $125-150, so a significant drop in costs. Having seen for herself the benefits of a attic fan, she allowed me to cut a hole in our new home to install this one. Even though the house was new, and had great insulation, this fan still helped to keep the heat to a minimum. I spray painted the aluminum cover with a galvanizing spray, then with Rustoleum brown, to match the house color. During summer, we keep the AC set at 75 when were gone (we both work), and drop it to 72 when we get home. After 10pm, we drop it to 69, because we sleep better when its cold. We use Green Mountain Energy as our provider, and they give us a decent rate. Our Electric bills are as follows: March: $68.74 April: $79.07 May: $123.76 Projected Cost For June (AS of this writing. I still have 2 weeks to go) $143.50 I anticipate a higher bill for June, as my wife took a week off from work and stayed home during the week. I'm sure it would have been lower had she gone to work. I also did an experiment last week. I shut off the fan from the power source for 2 days, so i could record the temps in the attic. I've also included 2 pictures of the before and after. The BEFORE (shutting off the fan) picture shows the highest temp in 48 hours was 135 degrees. The AFTER (turning the fan back on) picture shows that the highest temp in the attic was 101 degrees. Also, when the AC runs, since it doesn't have to overcome such a high temp in the attic, the house cools down significantly faster, which means less cycling of the outside unit, which means less energy used. As far as i'm concerned, this is a MUST HAVE for anyone in the Houston and surrounding areas. The cost of savings far outweigh the cost of installing this fan.
                    by
                      • Recommended
                      20 found this review helpful
                      My home stayed much cooler during the hottest days.
                      by
                      Response from Master FlowSep 30, 2026
                      Happy to hear that you are satisfied with our product and thank you for your feedback. If you have any other inquiries about our Master Flow products please email, masterflowtech@gaf.com MasterFlow
                      The fan seems to be well constructed and was received in excellent condition. It met my expectations.
                      by
                      Response from Master FlowSep 9, 2026
                      We are glad that you are satisfied with our product and thank you for taking the time to post a review. If you have any other inquiries about our Master Flow products please email, masterflowtech@gaf.com MasterFlow
                      Just what I needed. Thermostat included. Correct size for my roof pitch.
                      by
                      Response from Master FlowJul 16, 2026
                      Happy to hear that you are satisfied with our product and thank you for your feedback. If you have any other inquiries about our Master Flow products please email, masterflowtech@gaf.com MasterFlow
                      • Verified Purchase
                      I have had the fan in use for 3 weeks and have been very satisfied. What I had reservations about was the noise level, but no problem when installed as noise level low. Good value for price
                      by
                      Response from Master FlowJul 15, 2026
                      We are glad that you are satisfied with our product and thank you for taking the time to post a review. If you have any other inquiries about our Master Flow products please email, masterflowtech@gaf.com MasterFlow
                      This customer chose to rate the product and not provide text.
                      by
                      • Verified Purchase
                      This customer chose to rate the product and not provide text.
                      by
                      • Verified Purchase
                      installed one a year ago it works great haven't installed this one yet I know this one will also work great
                      by
                      Response from Master FlowAug 15, 2025
                      Thanks for the feedback. Glad you are satisfied with your Master Flow purchase. If you have any other inquiries about our Master Flow products please email, masterflowtech@gaf.com MasterFlow
                      • Verified Purchase
                      Showing 1-10 of 220 reviews