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Posted by Mark Witczak on January 12, 2008, 6:28 pm
When you do go into the attic, you may find that end of the vent hose
goes nowhere. Releasing moist air into a cold attic can cause
condensation, mold and (in the worst case) rot. It would be worth
inspecting the rafters if no one has done it in a while.
Mark
Zootal wrote:
> Go into the attic. Inspect the attic in general, and inspect the fan
> installation. You might find that the fan is OK, but the vent hose is
> blocked or collapsed, and simply needs to be re-routed or maybe just moved.
>
> As for vibration, it's possible it just needs to have the enclosure firmly
> attached to the ceiling joist. It probably doesn't take much to make it
> vibrate if it's just sitting there bouncing around. That may or may not be
> easy, depending on the design of the enclosure. You might be able to drill a
> hole in it and run a screw through it to the joist.
>
> It's also quite possible that the fan is an inexpensive high speed squirrel
> cage fan, which are quite common. Poor quality, mass produced, favored by
> contractors that buy in bulk and want to save every penny they can. A little
> bit of dust or lint in the blades puts off balance, and it vibrates. I
> personally remove them and throw them in the trash everytime I find one, and
> put a better quality unit in it's place.
>
>
>> The house I recently bought did not originally have a bathroom fan,
>> however one of the previous owners added one. They did a half-assed
>> job like every other project they did to the house. The house is a
>> standard ranch from the late 70's with a very low slope roof.
>>
>> First, the fan box is not attached to the ceiling joists. It simply
>> sits on top of the drywall. However, one edge of the ceiling hole is
>> right up against a ceiling joist. That's good. Second, it's obvious
>> the fan is not pulling air like it should. There is a hose attached
>> to the box, but I'm not sure where it goes. When the fan is run, it
>> makes a vibrating noise and there is no pull whatsoever on the
>> bathroom door or any other sign it's actually sucking air. If I take
>> the fan out and plug it into an outlet, it runs smoothly. I would
>> like to install a roof vent, and attach the box like it should be.
>>
>> There is little over 1 foot of space between the ceiling drywall and
>> the roof, as seen through the ceiling hole. In addition, there is
>> lots of blown fiberglass insulation in the attic. Needless to say, I
>> hate thinking about going into this attic. I could easily install the
>> vent by not going into the attic, but attaching the box is another
>> story.
>>
>> My question is: is there a fan box available that can be mounted from
>> inside the bathroom? I'm thinking of something like the "old work"
>> electrical boxes. I have thought about simply running screws through
>> the box into to joist. If I must go into the attic, I can probably do
>> that provided I wear a respirator and some sort of disposable
>> coveralls because of the fiberglass.
>>
>> Thanks for any ideas/insight.
>>
>
>
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