Hi, thanks for the previous help. My hvac fellow suggested a return in the finished and zoned basement (he's doing other things also). I've searched this forum, and sort of concluded that as long as it isn't “line of sight” to my hot water heater it is ok. Well the walls are drywall and insulated, but above the ceiling tile there are definitely connecting spaces to the equipment area, not big, but i'm sure air could flow. If I shined a flashlight i'm sure i would see light through it basically.
What is line of sight? Would my situation be considered safe? (Although it is zone and as supply ducts, the zone rarely calls)