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Old 03-02-2013, 05:34 PM   #1
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Bathroom vent code

The vent for my bathroom fan in the basement is currently vented with a "T" duct along with my dryer to one vent outside. It seems to me this is not code? Also, it's a fairly lengthy span of duct for the bathroom fan. Is there a max length of duct work for a bathroom fan vent? Thanks for any help in advance.


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Old 03-02-2013, 05:54 PM   #2
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T into a dryer vent is a huge violation----

Duct length and type of material for the bath fan? Good question---Gary in WA will know,I bet---


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Old 03-02-2013, 06:00 PM   #3
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There are 160 apartments in my building and only two exhaust fans for them all, so I don't think there's a maximum length. There are laws about how many hours per day the exhaust is working and how strong it has to be, but I don't see why duct length should matter.

And I wish someone cared about the rules that do exist because the exhaust fans in my building are constantly breaking and they've been down for about a month. They should require indicator lights in a part of the building visible to tenants because apparently I'm the only tenant who notices and cares when they're not working.

(the laundry room has its own exhaust in my building)
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Old 03-02-2013, 07:23 PM   #4
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Thanks, Mike! The problem is; lint will collect on the (extra) moisture on the pipe walls from the bath. They require separate ducting, per minimum code; no mixing of systems (1502.1) last page;

More dryer safety;

Use a Type "A" termination dryer hood, not "B";

The bath fan manufacturer may have duct length limits, check with them;

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17,000 dryer fires a year, when did you last clean the inside of the dryer near motor or the exhaust ducting?
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Old 03-02-2013, 07:24 PM   #5
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there is a minimum for how much air is drawn out of the room by the fan.. as for duct length it can be an issue. .if the run is extremely long and hte pipe isnt insulated the warm moist air can condensate along the way out then start to drip on the ceiling drywall which can cause mold
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