As part of the room being made in the basement, i have to have some duct work that vents outside for the portable AC. (my chinchilla room and they MUST be kept cool at all times. And a portable AC unit requires the ability to vent hot air outside. Tho the unit has an intake vent and an exhaust vent.)
I purchased the AC unit maybe 1.5~ years ago. (Cant believe its taken this long). I also had the vent unit itself, that goes through the wall to the outside of the house, put around the same time. So neither of those can be changed.
I did find out later that the diameter of the vent piece in the wall to the outside does not match the diameter of the vent tubes coming off the AC unit. I also have no more funding for this room, so im going to have to make due with the two vent pipes i already have. Thus my questions...
The wall of the room in the basement is around 2ft in from the cinder block wall of the basement. (long story but it has to be that way for now.) I also need the vent piping to come into the room far enough to reach where the AC will be. (Precise placement to be determined when everything is done, so im using best guess atm.)
Since it has been such a long time period and so much other stuff to do, i often wasnt thinking about this part since it was far off in the future. One day, many months ago, i walked by this (pic below) in the store and picked it up. Not sure if it would be the right size or not, but i was there. It beat a trip back later and helped me get an idea of what i was working with. So i grabbed two of these. They were a 4" diameter and 2ft long.
It fits in the outside vent piece fairly well. Tho has very small gaps since they dont fit 100% perfectly. (dont mind the second piece on the left yet)
But, as i said, it doesnt fit the AC vents. And as i looked into it, i found that none of them really do. All the vent pieces i saw were solid inch diameters. 4in dia, 5in, 6 in dia, ect. And the AC vents look to be on the 1/2" mark. So either way, im going to have to be playing around with some stuff here.
I also had gotten two larger vent pieces at some point. They are 5" diameter and 5ft long.
The 5ft piece goes well into the room. So i should be able to work with that.
The wall vent piece is roughly 4" diameter.
The AC piece iir is around 4.5" to 5" diameter.
So with those two pieces (4in diameter/2ft long and 5in diameter/5ft long) i have to make this work.
Id rather avoid cutting anything, cause if i mess up, i cant replace them. And they are kind of essential.
So my two questions are
1: The best way to do this.
Putting the 4" dia piece into the wall gives that side the best fit. Maybe put that in and then have the 5" dia piece overlap it? Or maybe just let the 5" one run straight to the wall without the 4" piece inside?
2: Either way, i will have some gaps to be filled. The size, depending on how i chose to do this. What is the best way to do this? Spray foam insulation, caulk, duct tape, compound?