Bathroom ventilation through roof?


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Old 05-28-02, 08:44 AM
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Bathroom ventilation through roof?

My bathroom does not have ventilation fan. The roof do not have soffit on the bathroom wall side. Can I just vent through the roof? There is not much space for making hole in the roof from the attic area. I saw some exhaust fans in Home depot. But they do not include any duct pipe. what pipe I need to buy?
Is it easy to do electrical work myself? So that both new fan and existing bath light use the same switch.
 
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Old 05-28-02, 04:41 PM
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Cool

Make sure that you get the right size fan motor for the cubic footage of your bathroom (widthXlengthXheight).
The housing of the fan/light fixtures may look the same within a brand, but they may have different size cfm motors.
You can wire the switch to operate the fan and light together or separately. Visit the Electrical forum for detailed how-to on those options.
Here is an illustration of an exhaust fan;

Good Luck!
Mike
 
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Old 06-17-02, 06:25 AM
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Thanks for your info. This is very useful.
One more question: Where do I get insulated duct?
I put 4" flexible duct which comes out of fan horizantally and curves upward. the other end of the flexible duct I put 4"" aluminium pipe which runs up to roof to roof vent.
How do I insulate this? or should i put insulated pipe instead of flexible and aluminum pipe. I live in colder region.
 
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Old 06-17-02, 09:44 AM
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You can call around to building supply companies or maybe heating-and-air suppliers for insulated ducts.
However, since you've already run duct work, you can just wrap it with regular batt insulation held on with duct tape.
If the batts have the paper vapor barrier, put the vapor barrier side toward the duct.
The insulation is to prevent warm air moisture from your bathroom from condensating in the vent pipe and running back down into your fan.
The duct needs to be insulated wherever it is in unheated space (attic, etc.). You can just lay it over horizontal runs, and tape it in place on the vertical duct.
Good luck!
Mike
 
 

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