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Posted by Mike on June 8, 2006, 3:52 pm
I've seen plenty of postings that one should not vent bathroom fans to
soffit or ridge vents. I completely agree about not using the soffits.
But how about using some blue foam, or other material, and making
some sort of 4" round pipe to ridge vent adapter. Think of all the
sheet metal HVAC adapters at home centers. But I'm thinking of just
fabricating something that custom fits my roof/ridge vent at one end
and a 4" round opening at other end. I can purchase a 4" sheetmetal
colar to make the round opening in the foam. This would force 99% of
the moist bathroom air directly out a portion of the ridge. The foam
adapter would protect the roof sheathing from moisture, plus it's
easily built on site.
Downfalls? reduced ridge ventilation for the attic - but I doubt
enough to have any impact
Appreciate any comments...
Thanks!
-Mike
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Posted by Joseph Meehan on June 8, 2006, 4:09 pm
Mike wrote:
> I've seen plenty of postings that one should not vent bathroom fans to
> soffit or ridge vents. I completely agree about not using the
> soffits. But how about using some blue foam, or other material, and
> making some sort of 4" round pipe to ridge vent adapter. Think of
> all the sheet metal HVAC adapters at home centers. But I'm thinking
> of just fabricating something that custom fits my roof/ridge vent at
> one end and a 4" round opening at other end. I can purchase a 4"
> sheetmetal colar to make the round opening in the foam. This would
> force 99% of the moist bathroom air directly out a portion of the
> ridge. The foam adapter would protect the roof sheathing from
> moisture, plus it's easily built on site.
> Downfalls? reduced ridge ventilation for the attic - but I doubt
> enough to have any impact
> Appreciate any comments...
> Thanks!
> -Mike
I don't think I would want to do it. However if you insist remember
that ridge vent is not open and has a fairly high resistance at the air
speeds a vent fan would be using so you would guess you would need a few
feet of vent in order to get something close to the efficiency of a
dedicated vent.
I might add that most ridge vents I have seen have exposed wood surfaces
and that warm moist air would damage the wood deck. You would need to make
some accommodation for that as well.
--
Joseph Meehan
Dia duit
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Posted by PipeDown on June 8, 2006, 4:16 pm
> Mike wrote:
>> I've seen plenty of postings that one should not vent bathroom fans to
>> soffit or ridge vents. I completely agree about not using the
>> soffits. But how about using some blue foam, or other material, and
>> making some sort of 4" round pipe to ridge vent adapter. Think of
>> all the sheet metal HVAC adapters at home centers. But I'm thinking
>> of just fabricating something that custom fits my roof/ridge vent at
>> one end and a 4" round opening at other end. I can purchase a 4"
>> sheetmetal colar to make the round opening in the foam. This would
>> force 99% of the moist bathroom air directly out a portion of the
>> ridge. The foam adapter would protect the roof sheathing from
>> moisture, plus it's easily built on site.
>> Downfalls? reduced ridge ventilation for the attic - but I doubt
>> enough to have any impact
>> Appreciate any comments...
>> Thanks!
>> -Mike
> I don't think I would want to do it. However if you insist remember
> that ridge vent is not open and has a fairly high resistance at the air
> speeds a vent fan would be using so you would guess you would need a few
> feet of vent in order to get something close to the efficiency of a
> dedicated vent.
> I might add that most ridge vents I have seen have exposed wood
> surfaces and that warm moist air would damage the wood deck. You would
> need to make some accommodation for that as well.
> --
> Joseph Meehan
> Dia duit
Do you maybe have a sealed off gable vent you can convert to vent the
bathroom. Cutting a hole in the roof (for a standard vent stack) sounds
like less work than what you propose.
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Posted by Mike on June 8, 2006, 4:21 pm
Joseph Meehan wrote:
> Mike wrote:
> > I've seen plenty of postings that one should not vent bathroom fans to
> > soffit or ridge vents. I completely agree about not using the
> > soffits. But how about using some blue foam, or other material, and
> > making some sort of 4" round pipe to ridge vent adapter. Think of
> > all the sheet metal HVAC adapters at home centers. But I'm thinking
> > of just fabricating something that custom fits my roof/ridge vent at
> > one end and a 4" round opening at other end. I can purchase a 4"
> > sheetmetal colar to make the round opening in the foam. This would
> > force 99% of the moist bathroom air directly out a portion of the
> > ridge. The foam adapter would protect the roof sheathing from
> > moisture, plus it's easily built on site.
> > Downfalls? reduced ridge ventilation for the attic - but I doubt
> > enough to have any impact
> > Appreciate any comments...
> > Thanks!
> > -Mike
> I don't think I would want to do it. However if you insist remember
> that ridge vent is not open and has a fairly high resistance at the air
> speeds a vent fan would be using so you would guess you would need a few
> feet of vent in order to get something close to the efficiency of a
> dedicated vent.
> I might add that most ridge vents I have seen have exposed wood surfaces
> and that warm moist air would damage the wood deck. You would need to make
> some accommodation for that as well.
> --
> Joseph Meehan
> Dia duit
I had not thought of the air flow resistance of a typical ridge vent -
good point! Maybe that is why many posts on this topic do not
recommend the somewhat common practice of simply stapling/hanging the
fan's exhaust pipe near the ridge vent.
I was just hoping to avoid putting a hole thru the roof to install a
typical roof cap. I'm very handy, but I stay off the roof these days
:) Guess I'll pay a carpenter to go up and do it :) Another option,
if I want to do the work, would be to install a wall vent. At least I
can get to that from the outside with a ladder. Easier for me to
inspect/repair should it ever leak too...
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Posted by Howard on June 8, 2006, 6:33 pm
There is also a vent damper that exits thru and down from the soffit
which puts it in easy reach and well protected.
Mike wrote:
> Joseph Meehan wrote:
> > Mike wrote:
> > > I've seen plenty of postings that one should not vent bathroom fans to
> > > soffit or ridge vents. I completely agree about not using the
> > > soffits. But how about using some blue foam, or other material, and
> > > making some sort of 4" round pipe to ridge vent adapter. Think of
> > > all the sheet metal HVAC adapters at home centers. But I'm thinking
> > > of just fabricating something that custom fits my roof/ridge vent at
> > > one end and a 4" round opening at other end. I can purchase a 4"
> > > sheetmetal colar to make the round opening in the foam. This would
> > > force 99% of the moist bathroom air directly out a portion of the
> > > ridge. The foam adapter would protect the roof sheathing from
> > > moisture, plus it's easily built on site.
> > > Downfalls? reduced ridge ventilation for the attic - but I doubt
> > > enough to have any impact
> > > Appreciate any comments...
> > > Thanks!
> > > -Mike
> > I don't think I would want to do it. However if you insist remember
> > that ridge vent is not open and has a fairly high resistance at the air
> > speeds a vent fan would be using so you would guess you would need a few
> > feet of vent in order to get something close to the efficiency of a
> > dedicated vent.
> > I might add that most ridge vents I have seen have exposed wood surfaces
> > and that warm moist air would damage the wood deck. You would need to make
> > some accommodation for that as well.
> > --
> > Joseph Meehan
> > Dia duit
> I had not thought of the air flow resistance of a typical ridge vent -
> good point! Maybe that is why many posts on this topic do not
> recommend the somewhat common practice of simply stapling/hanging the
> fan's exhaust pipe near the ridge vent.
> I was just hoping to avoid putting a hole thru the roof to install a
> typical roof cap. I'm very handy, but I stay off the roof these days
> :) Guess I'll pay a carpenter to go up and do it :) Another option,
> if I want to do the work, would be to install a wall vent. At least I
> can get to that from the outside with a ladder. Easier for me to
> inspect/repair should it ever leak too...
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Page 1 of 2 1 2 > last >>
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> soffit or ridge vents. I completely agree about not using the
> soffits. But how about using some blue foam, or other material, and
> making some sort of 4" round pipe to ridge vent adapter. Think of
> all the sheet metal HVAC adapters at home centers. But I'm thinking
> of just fabricating something that custom fits my roof/ridge vent at
> one end and a 4" round opening at other end. I can purchase a 4"
> sheetmetal colar to make the round opening in the foam. This would
> force 99% of the moist bathroom air directly out a portion of the
> ridge. The foam adapter would protect the roof sheathing from
> moisture, plus it's easily built on site.
> Downfalls? reduced ridge ventilation for the attic - but I doubt
> enough to have any impact
> Appreciate any comments...
> Thanks!
> -Mike