Designing Kitchens and Bathrooms - Basement bathroom fan ducting
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timmyg123
09-07-04, 05:29 AM
I need to run the exhaust duct to the other side of the basement,
to join up with the oven vent. But I have to go across a couple of
joints to get there, above the bottom of the joints since it will be
a drywall ceiling.
How do I do this?
to join up with the oven vent. But I have to go across a couple of
joints to get there, above the bottom of the joints since it will be
a drywall ceiling.
How do I do this?
Dave_D1945
09-07-04, 07:38 AM
How far is it to "the other side of the basement"? If it's more than 15' - 20', I wouldn't do it - long runs really reduce the air flow.
Can you do a shorter run?
Can you do a shorter run?
timmyg123
09-07-04, 11:01 AM
It is about 18' to the wall, 12' to the oven duct
where it'll join in.
where it'll join in.
Dave_D1945
09-07-04, 12:03 PM
Well, the length is probably OK but I see a problem crossing the joists. You definitely don't want to cut them so you may need to build a chase for your fan exhaust. You should also consider flappers where the two exhausts join. Without them, you may 'short cycle' the exhaust between rooms instead of outside.
MarkMA
09-08-04, 10:33 AM
I just installed two bathroom fans (from scratch) so here's my take.
1. All bathroom fans are supposed to terminate outside of the house without any tie-ins/splices. I put vents in two bathrooms that backup to each other and run two independent ducts to the sofit. (Building Code?)
2. Depending of the strength of the fan you are using you probably don't want a duct length over 20'. Try to use rigid ducting to reduce turbulence in the airflow from the expandable duct rings. I only used the expandable ducting for the first two feet to get the pitch established.
3. Remember that the air in the exhaust will be wet so plan for where the condensation in the ducting will go.
I'd suggest that you just run the ducting to the nearest exterior parallel to the joists (pitched slightly towards the wall for condensation run-off), drill a hole and install a vent (dryer vent style with a flapper). I think that you are asking for trouble with the install you describe.
1. All bathroom fans are supposed to terminate outside of the house without any tie-ins/splices. I put vents in two bathrooms that backup to each other and run two independent ducts to the sofit. (Building Code?)
2. Depending of the strength of the fan you are using you probably don't want a duct length over 20'. Try to use rigid ducting to reduce turbulence in the airflow from the expandable duct rings. I only used the expandable ducting for the first two feet to get the pitch established.
3. Remember that the air in the exhaust will be wet so plan for where the condensation in the ducting will go.
I'd suggest that you just run the ducting to the nearest exterior parallel to the joists (pitched slightly towards the wall for condensation run-off), drill a hole and install a vent (dryer vent style with a flapper). I think that you are asking for trouble with the install you describe.