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jrref 04-10-2011 09:59 AM

Roof Vent Question
My townhome was built in 1994 and strangely my 3 bathroom exhaust fans AND the dryer all terminate to a vent plate on my roof with a cover with an integrated "flapper".

All fans and the dryer have their own 4" insulated flex line terminating at this roof plate which has 4, 4" terminations on it.

All the fans and the dryer line have back-flow devices installed.

The question i have is since i'm having my roof re-done, should i terminate each line to a separate roof vent and have 4 instead of 1?

I was thinking of terminating at least the dryer to its own vent and the bathrooms to another.

My guess is that this doesn't pass code anymore.

Any recommendations or thoughts would be appreciated.


seeyou 04-10-2011 10:38 AM

How long are the runs and is there a booster fan?

The only times I've seen more than one appliance on a single outlet is when a remote fan is used for the bathroom vents or the runs for all the units are long and there is a booster fan helping all appliances. I've seen a dryer tied in to this circumstance.

Otherwise, the dryer should probably be moved to it's own roof jack. It probably won't hurt to have more than one fart fan on a jack.

jrref 04-10-2011 12:09 PM

There are no booster fans and the longest run is about 20 feet.

Everything seems to work ok just want an opinion if i should separate things out since i'm changing the roof.

bob22 04-10-2011 05:20 PM

I would not think a dryer vent should mix with other vents. Don't ask me why, I just doubt it.
Also, think about updating the dryer vent line to solid metal, not corrugated plastic or foil, for fire protection purposes while you are at it.

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