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Attic roof vent fan- brand unknown. need motor and blade

Put a new motor 3.4 amp 1050 rpm into a roof vent fan 6 years ago. Two years later, customer complained of noise so got new motor under warranty. Now, complained again. (I do not hear noise). Suspect bent blade. Unit has no marking on it. Thought it was Butler Ventamatic and was going to buy entire unit for $60 and swap motor and blade, until I discover blade is only 12". Butler Ventamatic does not make a 12" blade. No name on tstat or dome. Has metal flashing and dome, 3 stud mount. Can I take a chance and get 12" "universal" attic blade and should I use another 3.4 amp motor or get 4.3 amp? Thanks.

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Any Blade will be ok if it will fit shaft and they all should be cosistant and of course the higher the amp the better quality.I like the Pro 3 model at Home depot but I believe the Pro 1 gable is the 12 inch blade,pro 3 is 17 inch houseing and maybe 12 inch also.

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Posted on Apr 06, 2009

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I am looking for a umbrella cap to cover my 15 inch attic exhaust fan


Many people just use large black trash bags secured with duct tape or bungi cords. Black bags won't deteriorate as fast as the white ones with the UV rays of the sun and should last one full winter.

If you're concerned about the neighbors complaining about the lack of asthetics....I can't help you.

I never cover attic vents nor recommend them to be covered, because a properly vented attic all year long ensures moisture removal from the attic area and from the insulation. Also if you have shingled roofing, each nail point extending through the sheeting will condense moisture and drip into the insulation in a non vented attic space. This happens many times each winter when the air temp and the moisture content collide on the dew point scale. It does NOT happen daily.

The nails conduct the warmth to the outside, cool down and attract the moisture from the non vented air on their exposed length and slide down to the tip dripping into the insulation. Moisture detracts from the insulations ability to do its job, and that's to insulate the living space from abnormally cold or hot temperatures.

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Had three 50-gal American Standard water heaters installed Dec. 2009 Two upstairs in attic, one downstairs at ground level. Attic location used because heaters being replaced were up there. Upstairs...


Plumber is right.
Problem is not amount of air in attic. Problem is how hot the air is.
Oxygen molecules separate apart in very hot air and pilot light goes out since there is not enough oxygen density to support combustion.
http://waterheatertimer.org/images/Water-heater-in-attic-800.jpg
http://waterheatertimer.org/pdf/Attic-Ventilation-and-Pilot-Outage-in-Gas%20Water-Heaters.pdf

More ventilation is needed.
Plumber is not ventilating expert, and not responsible for attic ventilation that builder failed to install. Plumber should do a survey of location before installation to make sure gasoline vapors are not stored nearby, but summer attic ventilation is gray area until more general-public folks become aware of problem. Hotter summers temperatures will spread that information.

Hire local home center to install roof vents AND soffit vents.
Note: You also need soffit vents.
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Another solution is electric water heater for very hot locations.
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What and interesting situation. I have seen installations like what you describe, but not in a residential application. Industrial applications that had very high ceilings and in very old apartment buildings, But not in single family resident. I suspect, that the previous owners "acquired" it through unusual circumstances.

In any event, 1/3 horsepower electric motor is not that hard to find. The real key is getting the right rotation, so the blades will pull the air up and out instead of in and down. Remounting a new motor coupled with the right pulley size for a fan belt ,can control the speed of the fan. Rarely are hold house fans direct drive. Which may be the case with yours, I don't know.

As far as a new 1/3 Hp motor is concerned, I would recommend Grainger Industrial Supply
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Redesigned properly, you can do away with that horrendous shaft.

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