Internet #205924921

Model #ERV5BL

Store SKU #1001332803

1250 CFM Black Power Roof Mount Attic Fan

  • Helps cool attics up to 2,200 sq. ft. in size
  • Compact size with hemmed dome for a sleek look
  • High efficiency motor with adjustable thermostat
  • See More Details

Frequently Bought Together

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Price:
$9800

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 ERV5 Power Roof Vent is a great overall investment in attic ventilation. It 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 ERV5 model Power Roof Mount Vent can move air at a rate of up to 1250 cu. ft. per minute. It is designed for attic spaces up to 2200 sq. ft.
  • 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



Info & Guides

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BrandMaster FlowMaster FlowMaster FlowMaster Flow
Name1000 CFM Mill Power Roof Mount Attic Fan1250 CFM Black Power Roof Mount Attic Fan1250 CFM Brown Power Roof Mount Attic Fan1500 CFM Shingle Match Weathered Wood Power Roof Mount Attic Fan
Price
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Ratings
(124)
(113)
(113)
(206)
Power TypeElectric PoweredElectric PoweredElectric PoweredElectric Powered
FeaturesBuilt-in Screen,Thermostat ControlledThermostat ControlledThermostat ControlledAdjustable Thermostat,Built-in Screen,Paintable
Intake/ExhaustExhaustExhaustExhaustExhaust
Ventilation TypeRoofRoofRoofRoof
MaterialGalvanized SteelGalvanized SteelGalvanized SteelGalvanized Steel
Rough Opening Width (In.)15151515
Rough Opening Height (In.)15151515
Mounting PositionRoof MountRoof MountRoof MountRoof Mount
View ProductView ProductView ProductView Product

Specifications

Dimensions

Coverage Area (Sq.Ft)
2200
Cut-Out Diameter (in.)
15
Net-Free Area (Sq. In.)
600
Product Depth (in.)
25
Product Height (in.)
9
Product Width (in.)
25
Rough Opening Height (In.)
15
Rough Opening Width (In.)
15

Details

Airflow (CFM)
1250
Amperage (amps)
1.35
Color Family
Black
Color/Finish
Black
Color/Finish Family
Black
Features
Thermostat Controlled
Horsepower (hp)
1/12
Intake/Exhaust
Exhaust
Material
Galvanized Steel
Mounting Position
Roof Mount
Power Type
Electric Powered
Product Weight (lb.)
17
Recommended Sq. Ft.
2200
Returnable
180-Day
Ventilation Type
Roof
Voltage (volts)
120
Voltage (volts)
120
Wattage (watts)
160

Warranty / Certifications

Manufacturer Warranty
5-year Limited Parts/3-year Labor Warranty

Questions & Answers

47Questions33Answers

Does this plug into an outlet in the attic on the joise?

Asked by Art December 18, 2020
5
Answers

This product must be hardwired to your house electrical system. If you have any other inquiries about our Master Flow products please call Technical Services at 800-211-9612.

Do I need to purchase anything else with this or is it a complete set for a new set up?

Asked by Tony July 5, 2020
4
Answers

You will need some caulking and maybe some roofing nails long enough to go through however many roofing layers you have and into the sheathing.

Does it have a thermostat to control the motor?

Asked by Todd May 1, 2016
3
Answers

yes

I have installed a new roof and the fans came as well. One fan runs almost constantly and the el...

Asked by cdl April 13, 2018
3
Answers

Our thermostats are designed to operate until they reach a set temperature. If you set your desired setting 105 degrees F (recommended), the fan will operate until the temperature in your attic is 5-7 degrees below the device setting (98-100) before shutting off. If the temperature is set to lo (70-80 degrees) it may never turn off depending on the outside temperature being pulled in the attic. If the air temperature is 75-80 degrees during the summer months, the lower setting my no be achieved and the fan will continue to operate.

Is this okay if you get snow

Asked by Twothumb July 5, 2019
3
Answers

Yes had mine for two years now it’s fine

I am replacing two existing, but not working, vents. My house is single story 2200 sq ft. Will ...

Asked by mikec August 18, 2017
3
Answers

I think from your description that you plan to install two fans. the combined CFM would be 2500 CFM but the kicker is how much eave vent area do you have to replace the air being removed from the attic. If you don't have enough vent area to replace the air the fan is trying to remove you will be placing a burden on the fans and making them work harder and possibly wear them out sooner. They make lesser CFM fans that you may want to consider.

It states it has an internal heavy duty screen to prevent animal infestation. Would this screen a...

Asked by Jaime August 4, 2017
3
Answers

The screen is 1/4 mesh screening. If you have any other inquiries about our Master Flow products please call Technical Services at 800-211-9612.

How loud is the fan while running? Do you notice when it switches on?

Asked by James July 10, 2017
3
Answers

Normally, you cannot hear this turn on or run from inside your house. I have mine directly over my master bedroom and I can't hear it. Note that when I first got it, it was out of balance and was very noisy. I had to balance the fan blades to fix this.

IS THIS A SOLAR FAN

Asked by Terry August 13, 2020
3
Answers

No, this is an electric fan that runs off of typical house voltage. If you have any other inquiries about our Master Flow products please call Technical Services at 800-211-9612.

Is the black wires with the cap the ground

Asked by vra111 June 2, 2017
3
Answers

The black wire with the cap is a hot wire going to the thermostat. It shouldn't be uncapped. There is a ground lug inside the housing for the ground wire.

1250 CFM Black Power Roof Mount Attic Fan - page 2

Customer Reviews

  • 113 Customer Reviews
  • 4.4 out of 5 stars overall
87% of customers recommended.
Overall Ratings
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I purchased this to replace an older one that I installed in 2007. The old fan unit got filled wi...
I purchased this to replace an older one that I installed in 2007. The old fan unit got filled with dust and dirt when the roof was replaced, otherwise I think it would still be functioning perfectly. This unit has 5 verses 4 blades and is more powerful. I ALWAYS test the unit on the ground first before dismantling the old or making any roof preparations! Just hook up a 16 gauge short extension cord making sure to place the common in the common side (larger opening) and the hot on the power side. It worked fine on the ground so I removed the old and installed the new in about 3 hours. I also add straps to insure the unit will be stable during strong winds. I set the temperature at 110 degrees F and it has been working great. In my opinion these are very good units.
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Works great. Very silent.
Works great. Very silent.
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Barrett Roofing installed my previous one I 2011 and they installed this one too! Quick easy roo...
Barrett Roofing installed my previous one I 2011 and they installed this one too! Quick easy roof install because I didn't have to do it, but I did make the final electrical connections and they were very easy to compete. This version only had a thermostat; however, the previous in contained both thermostat and humidistat. Overall, a quiet unit and easy install! Thank you, Gary
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Easy installation, pretty quiet and great suction. Recommended!
Easy installation, pretty quiet and great suction. Recommended!
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Works really good
Works really good
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I purchased two of these back in 2007. The only thing I ever had to do was oil them every few yea...
I purchased two of these back in 2007. The only thing I ever had to do was oil them every few years in the Spring time and make sure they were functioning properly. We had a new roof put on in December and in January we found out that the roofers had damaged one of these as the top came off! I purchased this one to replace it. I love that they come in different colors now. We needed brown. As soon as it arrived I hooked up a temporary plug (used an old plug line with wire nuts from a lamp and made sure common and hot wires were correctly aligned). Then I placed the unit in the sun and waited for the temperature to get above 70 degrees. It went on perfectly. Then I set the thermostat to 105 degrees and used a heat gun. I also had a thermometer near and when the temperature got to 105 it went on perfectly again. Now it was ready to be installed. I do a lot of handyman work and I ALWAYS test these things BEFORE I install them to make sure they work. I set the thermostat to 105 and installed it in the attic. I used a switch in the attic so I could easily turn off the power to it while wiring the new unit. I tested one more time with a heat gun and it worked fine. I really like the MasterFlow brand. By the way the second unit I have is doing great at 13 years old!
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Great fan easy to install. Works good.
Great fan easy to install. Works good.
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The price was right. I bought the largest of the models offered. Roofers did install, and I put ...
The price was right. I bought the largest of the models offered. Roofers did install, and I put in the electric. Looks nice also. Thank you Master Flow. Money well spent for cooling and prolonged life of shingles.
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Love it p. Pretty easy to install....
Love it p. Pretty easy to install.
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Ready to go right out of the box. Quiet....
Ready to go right out of the box. Quiet.
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