hi all.. will i have a problem running the 4" exhaust from the
Portable Air Conditioner (dripless) through a 3" inch hole in the
outside wall, about 12" length, using a 4" to 3" adapter?
There are no windows in this cold cellar and the intake pipe on the
other side is a 3" ABS through the outside wall with an identical 3"
ABS the opposite outside wall (that i plan on using for exhaust of
Hey--good to hear from you again.. been a while :)
I know the airflow will be reduced; my question should have read
"would the amount of airflow restriction make a significant
difference?" Or.. will it still work just not 100% effecient? More
like 95%? It's such a tiny space and i only really need it to be
cooler and drier during the summer which, up here in Toronto, is quite
short. But brutally Hot and Humid (and beer affecting) for those two
Okay i don't feel like taking it all apart and drilling those two
holes an inch bigger etc. Ya Ya i'm getting lazy.
So.. big difference or negligible?
The Cellar is located under the front landing and is 10ft x 5ft with
an extra 4ft x 4ft (with sloped ceiling) under the front steps.
Two 3" ABS pipes through the masonary walls, one at each long end of
the 10ft x 5ft part. One ABS pipe extends down near the floor. This
design came from an article written by some "expert" in home renos and
was supposed to provide airflow for the little cellar and bring cool
air in (from the pipe that goes near the floor). I even installed the
more expensive wire-shelving so that air could "flow" through the
There is no "wind". In fact, so little air flowed that i installed a
bathroom fan vented out one ABS pipe (the one with the opening near
the ceiling) to encourage airflow (I had some mould growing before i
did this last year and since it has not returned. However, the little
space is at least 75%-85% humidity during this hot spell and 21 deg C.
It's 66 sq ft. Low ceiling. Fully insulated on the basement side
with a proper heavy, insulated exterior door with all the
weatherstripping. I just want to cool and dehumidify the tiny space
during the summer. The wine likes it better that way.
Does any company make a tiny little PAC with 3" exhaust? I can't find
one--just a 7500BTU unit with 4" venting. I already tried a regular
dehumidifier but that creates a lot of heat.
It's just a closet.
Ok Dan, I'll give it a try;
Let's say your space is 10ft x 5ft x 7ft = 350 cu. ft. And lets say you
need to ventilate your space completely 9 times an hour, so that's 3,150
cubic feet each hour, which requires 52.5 cubic feet per minute to
ventilate - . Let's look at most blowers and what they can move, generally
speaking, at 1/10" static you would need about 7" dia, at 1/2" static about
3" - 4" which is where you're at. So, if your blower can produce 1/2"
static pressure, you can move 50 cfm approximately. [That's assuming per
100' of resistance in duct. Which you have much less.... ]
If you want to dehumidify an area, you need to remove not only the humidity,
but the heat generated through the heat of compression as well. So good
luck - if I were you, I'd call a local, competent, licensed, insured, and
Thank you for the information. I found a DeLonghi Mini-Split Portable
A/C unit that has this small umbilical between the outside and inside
unit (1" x 2.5"). However, it looks like overkill--11,000BTU rating--
something that is made to cool a large living room, not a 350 cu. ft.
It's only 4yrs old, i saw it working fine, and he only wants $200 for
But will it work? Or will it cool too fast to dehumidify?
Again, always appreciate the information provided by the competent,
licensed, insured, and trained professional hvac enthusiasts here on
this newsgroup :)
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