Customer Reviews for Master Flow 1250 CFM Mill Power Roof Mount Attic Fan

Very poor design and low quality when is rainy water bounces back from roof to the blade and drip to the attic space. Contacted manufacturer and they don’t want to do cover the damages to my ceiling.Worst customer service I ever experienced.

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.

Works great. Very silent.

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

Easy installation, pretty quiet and great suction. Recommended!

Works really good

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!

Great fan easy to install. Works good.

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.

Well I just put this units in so not sure yet how they’ll work and hold up but I like what I see and read about them. Attica temp is down 25* on avg, so far so that will add up to money saved on cooling. And my roofs condition will last longer without so much heat.

This fan was installed in about 4 hours. The most time spend getting support for a steep roof location. After that the install went smooth. This works great. Vents the attic completely. The thermostat is set at 100 degrees. The fan is very quiet.

Sorry, it was no longer needed. I returned it for a refund.

Let's hope it last more than 3 years like my other one did. This one is supposed to have ball bearings in the motor not brass bushings like the first one. Time will tell.

I can't give an honest opinion of how this unit works. I called an electrician that was recommended by Home Depot to install it. The one gave me a ridiculous price of $2,900 to basically cut a hole in my roof. He wanted to run an additional breaker into my panel box and the basement and run it up through the conduit on the side of my house and then into my attic and feeding the unit the power it needed. This unit only requires three amps of power. There was a junction box located approximately 6 ft from the desired location in my attic. That could have been readily accessed. Because of this failure I had to return the unit. I purchased a different one that I could plug in called a roofer and was quoted $150 to secure it to my roof. My advice is to buy the one that you can plug in and don't get conned into using electricians that overprice their work. PS I could have done all that myself but I would rather have a professional do it.

My original order had a damaged hood from the factory as the carton was in perfect condition. I feel the Flashing should be slightly larger and one of the rivets leaks water when it rains.

Good air flow and quiet operation!

Fans our made as cheap as possible blades our not in line and causing fan motor to make loud sounds

Replaced my old attic fan with the same model.

Much quieter than our old one but wish it had a test switch