Rated 4.1 out of 5 by 94
Rated 4.0 out of 5.0 by KMat Good Value and much quieter
I have had two of these installed in my attic for the past 15 years. They are usually on all day every spring and summer and worked great. At almost exactly 15 years, one of them just wore out and failed. I went down to HD and got this latest version and replaced the worn out unit. The old unit wasn't too terribly noisy but the new version is super-quiet. That was a very nice surprise.
A few months later, the other one failed so I guess the lifespan you can expect is right on 15 years. I think that is pretty good considering how much mine worked during 2/3 of the year, every year.
So, I went down and got another to replace it. These new ones are so quiet, I really can't hear anything from the bedroom right underneath them when they are on. I had to stick my head up in the attic to make sure they were actually working.
They are very easy to install and move a lot of hot air out of the attic. It makes a huge difference in the house temperature in the summer.
March 24, 2015
Rated 5.0 out of 5.0 by Paul2037 Great Gable Vent Fan
I used this to replace one that was at least 35-40 years old and the thermostat had broke and the fan was noisy. Happy to report the new one runs great, makes a huge difference in the heat and moisture in my attic I don't hear it at all and helps bring the house temp down. I started to monitor it after our home seemed much hotter than before. That was when I realized the old fan had stopped working and we had some really high attic temperature readings 130 degrees and up range. Since putting it in the highest tempurture reading has been 118 degrees. The fans set to turn on at 105. I would suggest installing early in the morning, or on a cool day if you can. I wanted to get it in and running so I just did it. Setting up another fan to give you some air relief while you work could be a good idea. I think I lost 5 lbs installing it as it was really hot in the attic the day I did it. Installation was easy ,the hard part was just moving around and working in the attic. I would say it took me about 1 hr to install.
June 10, 2015
Rated 5.0 out of 5.0 by DLO575 Effective and quiet fan
This fan is probably about as quiet as it can be. There is no detectable hum or vibration, just the sound of rushing air. It moves a lot of air. Judging by how hot the outflow is, it must be reducing the attic temperature significantly. Installation was simple and didn't take very long.
July 28, 2013
Rated 3.0 out of 5.0 by RobertB works ok, could be improved
The thermostat control turns on at about 20F higher than the indicator shows - I had to set it at 70F to get it to come on at 90F. But is seems to work reliably at that point. It also would have been nice if the control had an on position that would force the fan to run, but I can live without that. Noise is kind of a muted rumble - I don't think it can move much air without noise, and this seems to move quite a bit.
June 10, 2015
Rated 1.0 out of 5.0 by lonzo not so good
Right out of box blades hitting one side of housing, other side as 3/4 inch clearance whoever put this together should have seen this and fixed problem.have not installed it yet hope its quiet, their is no vibration eliminator on mountings.if its noisy I will return it.
June 16, 2015
Rated 5.0 out of 5.0 by GreenhouseGrower Low amp draw and good air flow for the money.
I purchased the Master Flow 1540 CFM Power Gable Mount Vent to today with the idea that I would need to return it based on a few reviews claiming the fan is loud and poorly built.
They must have a defective fan or installed it wrong. The fan works fine.
I could not find any amp ratings, VA ratings or dB ratings on the fan. So I tested the fan before installing it. At no load (0.SP) it used 186watts @ 124Volts and pulled 1.7 Amps. I could not measure the dB but it is in the range of 75dB to 80dB. I have a high velocity 3-speed indoor fan that is louder.
I purchased the fan to use in my 12ft by 10ft greenhouse that required 1440 CFM air change. Running the fan 10hrs per day at 186 watts it will cost about $0.21 cent per day or $6.24 per month to operate. Starting amps was just over 2.5amps. I could later convert this fan to DC with a 200watt dc/ac convertor and a 12v/25amp/hour battery and charge the battery with a solar cell.
Specifications on other fans with about the same air flow used 2.5 to 3.4 amps. This fan has the lowest amp draw for about the same air flow. I could have purchase a variable speed fan and lower the amp draw to 1.1 amp but the fan with controller was $268.00. Not enough pay back to spend the extra money.
I would recommend mounting the fan face down on a per-cut frame or piece of plywood so that you do not get the housing out of round, then lift the fan into place. This will help eliminate the any vibration after installed.
January 18, 2012
Rated 5.0 out of 5.0 by DavidM Easy Installation, works fine so far
I installed it yesterday. It was really simple.
I held my trouble light against the thermostat to test it and it worked perfectly.
Previous comments complained about the screws hitting the fan...not a problem, I just put notches in each of the fan blades so they could spin freely.
I guess MasterFlow fixed the issue. My screws were low profile so there was plenty of space.
I am happy with the fan and recommend it, especially at $84 (the price in June 2013).
June 11, 2013
Rated 4.0 out of 5.0 by happy Started Saving Money AfterThree Months
In Sacramento, CA this attic fan costs about $8.00 per month to run 7hrs/day in July 2010 through SMUD. That's $0.26/day.
If it trims your $200 HVAC bill by 15% you save $22/mo. in July, ~$20 in June and August.
Fan costs $80/$22=3.6 months (#hot months to break even*). After the first hot summer you will pocket at least $60 per summer thereafter. Not including wear and tear on HVAC and added air filters, noise from HVAC.
* break even cost assumes proper DIY installation.
November 5, 2010