I have a split/tri-level house and am trying to put a shower in the
basement where a 1/2 bath alread exists. I ripped out the walls and
the ceiling in the bathroom and found that the main HVAC supply trunk
goes from the air handler just outside the bathroom, above the ceiling
and down the back wall of the bathroom. The trunk does a 45 degree
angle from the ceiling at a downward angle at the end of the bathroom
behind a fake wall setup to hide the duct, goes down behind the wall
and does another 45 degree angle travelling the same direction out of
the bottom of the bathroom wall. It goes through an opening in the
cinder block foundation out under the other side of my house that only
has one level (the bathroom is just on the other side in the
downstairs level if that makes sense). This trunk then supplies a
kitchen and a family room.
My HVAC problem is that where they did these 45 degree bends was not
in one isolated corner of the bathroom or the other but about a foot
or so away from the corner. Ideally if I could take out the whole
duct and use this space for my shower I would be set but of course
then I wouldn't have HVAC in my kitchen or family room. Plan B would
be to move or replace a small section of the duct beginning in the
ceiling, move it over as tight into the corner as possible and then
just build a very small L shaped wall to hide the duct in the corner.
This would give me an extra foot or so width for my shower. I
shouldn't have a problem cutting through the cinder block but I was
hoping that I could cut the exisitng sheet metal duct from somewhere
in the ceiling and replace just a section of it with flexible duct.
This short flexible duct would then be spliced back into the existing
sheet metal duct work under the house. I am guessing the run would be
no longer than 10ft. Is splicing flexible duct doable or should I
replace this section with matching rigid sheet metal duct? The run
from the air handler to my kitchen is 8 ft at the most, but the bend
going down the wall adds to this length. The kitchen and livng room
area are at the most 500 sq ft. There is a separate trunk handling
that won't be touched handling the rest of the house. Thanks in
Unknown to the average homeowner, flexible duct offers *more* resistance to
airflow than straight sheet metal by one size or more. In other words, a
12" steel duct would have the same airflow as a 14" flex. Understand
though, the newer flexible duct really isn't that flexible in the sense that
you can't make it square. And flexible duct doesn't like making quick turns
like sheet metal can [with turning vanes.] And, if you take flexible duct
vertical, that it has a tendency to "pull" on the connections and it can
come apart where sheet metal is [screwed] or has mechanical drives holding
it in place. Sheet metal duct is more costly [especially special made to
fit sizes]. But it will out last.
You might be better off seeking some outside HVAC help here.
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