Planning for heat pump lines through conc. wall pour
JohnWalker
| Posted in Energy, Heating & Insulation on
I am hoping to place some 3″ ducts or similar for the installer to thread the lines from a air source heat pump into the mechanical room. The mech room is in the basement which will have concrete floor and walls. Does anyone have any input on sizing etc a pair of PVC ducts and if long sweep (24″ radius) bend on the end up through the floor slab is workable?
Thanks
John
Replies
Wher did it go?
I posted a reply to this yesterday, but it must have fell off the edge of cyber space.
3" pvc with a long sweep elbow will work. That is what we used on some 300 or 400 HUD apartment units.
Just be sure to stub the end in the slab up higher than the finish grade by several inchs, and glue a cap on it (don't count on duct tape to work). Concrete guys can manage to get concrete in just about anything uncapped. even if it is several feet above the finish grade.
Cut the pipe off flush with the floor after the slab is poured. Feed the line set form outside to inside and when it reaches the elbo beneath the slab, just rech in and gently pull it through the bend while a helper pushes from the outside.
Be sure to plug both end of the duct after the line set is installed. Darn thing are like a super highway for vermin to get in if you don't.
I'm curious about why the concrete walls. Sound insulation?
we might be getting a little off track here...
Its a walk-out basement. The mechanical room is below grade in a corner with two exterior concrete walls. The floor slab is concrete. The intent is to run ducts from the mechanical room, through the floor slab and out to the walk-out side of the basement. Once outside the footing they are only a foot or two below grade.
Sounds like 3" with 24" bends (one at each end) is ok.
thanks all
John