Any issue with return grill on return plenum? I know it is not allowed for combustible furnaces. This is interior of condensor/evaporator for heat pump. I am thinking that if this grille is open it will not pull as much air from the return grilles through-out the home.
[quote=“mnicholet, post:1, topic:33113”]
Any issue with return grill on return plenum? I know it is not allowed for combustible furnaces. This is interior of condensor/evaporator for heat pump. **I am thinking that if this grille is open it will not pull as much air from the return grilles through-out the home./**quote]
Your thinking would be correct the blower will draw from the path of least resistance. It appears to me that the furnace is located in a basement is this correct. Most every basement That I know of has a musty smell that I would not want distribuited through out my home. If there are no gas combustibles appliances within ten feet of the furnace one cannot get into a code fight over this. Its just a dumb install IMHO
[quote=“cbottger, post:2, topic:33113”]
The red is a US requirement.
It is a dumb location for a return grille unless they are trying to use the AC (if it is a reversing HP/AC) for summer basment/crawlspace dehumidification. Depending on summer conditions and the amount of AC needed in your area, it may be better/cheaper to use a dehumidifier in an unfinished crawlspace.
[quote=“Brian_A.MacNeish, post:3, topic:33113”]
There is nothing unsafe about the location of this return; my only concern is that it appears too large.
Wouldn’t adding a dehumidifier in this situation result in more energy being used as opposed to having a Reversing/HP/AC unit properly balanced.
My thoughts only,
[quote=“mgratton, post:4, topic:33113”]
Just lost 3 paragraphs to cyberspace on why I think the dehumidifier was the better choice in this crawlspace situation. In general, it may or may not cost a bit more but IMO, it will do a better job as a dedicated unit than the general HP/AC system.