Model # PR2DWW

Internet #100073735

Store SKU #108877

Master Flow 1250 CFM Power Roof Mount Vent in Weatherwood

Master Flow

1250 CFM Power Roof Mount Vent in Weatherwood

  • 5 Year Parts Limited Warranty; 3 Year Labor Limited Warranty
  • Adjustable thermostat included
  • Effectively ventilates up to 2400 sq. ft. of attic space
$4230 /each
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Frequently Bought Together

Product Overview

The Master Flow Pro2-Power Roof Vent is a great overall investment in attic ventilation. This Roof Vent removes the greatest volume of hot and/or humid air from your attic, compared to our other models, saving you more in heating and cooling costs. Available in weathered wood.

  • Helps reduce energy costs and helps prolong the life of the roof and shingles
  • Excellent for roof slopes 3:12-12:12
  • Large pre-punched flashing for easier installation and less chance of leaks
  • Blows hot air outside and cools the attic
  • Galvanized steel construction for durability
  • Heavy-duty metal screen deters animals, birds and insects
  • Miami-Dade county approved and Texas department of insurance listed
  • Optional humidistat available (H1) - sold separately

Info & Guides

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Warranty / Certifications

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Customer Questions & Answers

does the fan come with a thermostat?

i thought all roof vent fans came with thermostats.
Asked by: tom
yes, adjustable temp control
Answered by: Tony
Date published: 2017-01-04

what is the noise level of the fan ? Please compare it to known sounds like a vacuum cleaner

Asked by: Carla
Similar to an central air fan
Answered by: Tony
Date published: 2016-12-13

Is there an On/Off switch on the fan or thermostat?

Should have that switch for safety when working on or near it.
Asked by: RickNY
No, Temp control setting
Answered by: Tony
Date published: 2017-01-03

Can this fan be wall mounted

Asked by: builder1
Roof mount design, cover would take in rain if wall mounted
Answered by: Tony
Date published: 2017-03-03
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Customer Reviews

1250 CFM Power Roof Mount Vent in Weatherwood is rated 4.4 out of 5 by 47.
Rated 5 out of 5 by from So far, So good Just took the fan out of the box for some preliminary testing. Here are my thoughts so far: Well built unit, heavy gauge steel for dome and "duct". Assembled with bolts, not sheet metal screws. Dome supports heavy duty. Fan blade is "3 wing" type with the blades riveted to the hub. Much better design than the 6 blade stamped steel fan used on cheaper models. Fan runs quiet with decent airflow. Electrically the fan uses the PVM105 1/7hp motor. Motor is rated at 1050rpm/1.9amps. Motor is heavy duty PSC design with a 10uf capacitor. PSC motor designs are much more efficient than the cheaper "shaded pole" motors. I hooked it up to a "kill-a-watt" and the Motor Amps read 1.51A, Wattage 163W, Power Factor .88. Power use for a month based on 10hr per day run time would be 50kwh/month. If you pay 10 cents per KWH it cost about $5/mo to run the fan. IMHO the extra $15 over the entry level fan is well worth it. In addition to the better fan blade/motor you also get a paint job. I'll write another review once the unit is actually installed on the roof.
Date published: 2011-07-23
Rated 5 out of 5 by from This Fan Rocks! This was a piece of cake to install. I removed an old heat vent from the roof and cut the existing hole with a jigsaw about 1.5 inches larger. I slid the unit under the shingles, nailed it down and used plastic roof cement as instructed. The electrical hook up was easy as I tied into an existing circuit found in the attic and tied into it using 20 amp wire, staples and a new j-box with switch. This fan has cut my run time on my 5T unit by 25%. I set the t-stat @ 80deg for now as I want the attic to cool at least this low. I'll re-adjust to 95 in July sometime. Great product, low electrical usage and BIG savings on my HVAC usage.
Date published: 2014-06-10
Rated 5 out of 5 by from Cool running :) I hadn't installed a roof mount in 40 years so I was nervous but all went GREAT. The heat that came out once I punched the hole was like putting your head in a hot oven. Instructions were simple, it's all about organizing your work. I have very sensitive hearing and it took a very quiet room and concentration to hear the fan from inside the house. We love it and notice the considerable difference in our home temperature. PS I watched a couple YouTube videos to help with confidence on installation.
Date published: 2015-08-04
Rated 5 out of 5 by from One heck of a value This fan is a great value as it includes the thermostat and a 5 year warranty! Masterflow is a GAF brand. The unit is all metal, I don't think their is a piece of plastic in the whole thing. I would say the sheet metal brackets that connect the dome to the main chassis seem a little flimsy, but I guess they must be good enough. Seems to have a nice motor. It's not loud either. Has a nice large flashing. The instructions are very good which helps a lot with installation. Not only is there an extensive FAQ section, but they also provide detailed tables to help you determine the size and quantity of fans you need for your application, plus your makeup air vent requirements. Be sure to follow the instructions for a good install. You don't want to go to all that work then have it not work optimally. Be sure to remove some of your soffit vents and check them as I found that all of mine were clogged with environmental filth and had to be replaced. Also make sure that insulation in the attic is not blocking the movement of air from the soffit vents up through the fan. This can and should be corrected otherwise you're wasting your time. I'm very pleased with this fan. What a great value--especially if you have a coupon to apply to your purchase! :-)
Date published: 2010-06-20
Rated 5 out of 5 by from Quiet, and makes a noticeable difference This fan is VERY QUIET!! and moves a decent amount of air, I bought this based on reviews here, vs the one at the big blue box place. Someone on that review site mentioned how loud their unit was, and that they exchanged it for this one sold at the Home Depot. They mentioned that the quality of this fan was significantly better that the blue box one. If you look closely at the pictures on the two websites, you can discern a difference. I bought this fan to install in my recently purchased house that has a hip roof. I went up into the attic a few weeks ago when the temp was in the upper 80's outside, and my attic felt like it was 120F. Someone mentioned that this unit does not come with a template. That is technically true, but......The cardboard packing inside the fan box is cut to the shape of the round inlet. All I did was take that piece up on the roof with me, and it worked like a charm. Wiring the fan was easy. You will need a cable relief/ connector to run your romex (or in my case conduit) to the box that contains the thermostat. The cover pries off. No screw removal needed (but the instructions do not indicate that- and when you are working in the attic, every minute counts). The thermostat box is not too tight, and they give you plenty of wire to work with. Getting the cover back on was a little bit of a chore (in a hot attic- before the fan was running) but you will want to make sure that the U shaped cover piece's tiny lips go over the part with thermostat attached. My fan seems to be perfectly balanced, and there is no vibration felt when touching the unit. The unit is very quiet. When I climbed out of the attic (before replacing the attic access cover) I could not hear the fan while standing on the ground. There is no way you will hear it with the cover in place, I will have to crawl up in the attic occasionally to make sure it is working. I guess I will know it is working, because the temperature in the upper level of my house should be much more comfortable, and hopefully my utility bill will decrease.
Date published: 2013-08-25
Rated 4 out of 5 by from A good value roof mounted power vent Like all of us, after reading reviews I decided to install this unit in our attic. We're located in Kansas, and our summers aren't like the south, but we do have hot and humid days. The local HD had 3 of these units in stock. Upon opening, the unit was in good shape, no damage. It appears to be a well made fan assembly. I did notice that the "varmint" screen was pulled taught and there was about a 1/4 " gap in some spots. That was quickly remedied with some silicone. The instructions were 1 page with 7 steps. Enough info to do the job for most DIY folks. The container had a 15" diameter template for aiding in cutting your access hole. It took me about 3 hours total to install. I had some sealing membrane leftover from a skylight install, so I used it to seal up the flashing under the surrounding shingles. The color of the cap matches our shingles perfectly. I would have been ok with plain steel or black, but "Weatherwood" is a great color. In addition to the sealing membrane, I also used pure clear silicone to seal everything. You can opt for roofing tar, but if you're not careful it can get away from you and end up in places you didn't want. The thermostat hasn't changed much over the years. Easy hook up to your incoming power. You will probably need to purchase a wire clamp for the thermostat box to be in compliance. That will prevent the wiring from rubbing on the sides of the bare hole. The fan runs fairly quiet. And it does pull more than enough air out of our attic. It comes with a 5 year limited warranty on parts, and an additional 3 year "labor" warranty to have someone remove the fan and reinstall it. Not bad. All in all, I believe this fan is a good value for the current purchase price ($85.50).
Date published: 2014-11-09
Rated 5 out of 5 by from easy to install, works great The fan only took 2 to 3 hours to install as it was my first time to do so. Wiring was very easy. The fan is quiet and smooth w/ no vibration. I can tell it is helping out quite a bit because my AC doesn't take until after midnight to catch up. My only concern (and this is just on my part not the fan) is that i probably could use another one to help out. I was told by GAF that the electrical usage would be very minimal on a yearly basis.
Date published: 2011-08-25
Rated 5 out of 5 by from Very good fan This fan did two very nice things for me. By removing the hot air from the attic this past summer, it kept the upper floor of my house cool. It used to be that when walking up the stairs, the temperature got noticeably warmer. No longer! The second thing that it did was to pay for itself, including having my roofer install it, by saving money on my electric bill each month. And, it's pretty quiet. Only a slight hum is heard on the upper floor, and only if you are listening for it.
Date published: 2013-11-11
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