Originally Posted By: Michael Barry This post was automatically imported from our archived forum.
Home was built in 1986. Bi-level, no basement. Natural gas furnace and hot water heater located in garage. Furnace is upflow condensing gas, Whirlpool label but apparently made by Heil, Model NUGK050LF01. Exhaust is vented through a PVC pipe that exits through roof. There is no outside air intake pipe.
Contemplating replacing furnace with two-stage model.
2 contractors propose to install the same way present furnace is installed.
1 contractor proposes to install with 2 pvc pipes going through side of house for air intake (combustion?) and exhaust.
1 contractor proposes same but with pvc pipes going through roof.
It has also been said that the replacement furnace cannot sit on the floor like the present one but must be raised and set on blocks.
Altho’ we’ve lived for over 18 years with the furnace drawing air from the garage, it seems logical that an installation drawing outside air would be better (no brainer?).
Opinions, advice, comments deeply appreciated and will probably help me out of this quandry. Thanks.
Originally Posted By: cmccann This post was automatically imported from our archived forum.
Michael,
I recommend that you go with the 90% induced and exhaust type with PVC that goes through the wall. The roof has enough problems. Also it is required that all ignition sources be 18" above the floor in the garage.
Originally Posted By: rsummers This post was automatically imported from our archived forum.
Michael some units do not have to have the intake for combustion ran to the outside. If it is not required I wouldn’t run it unless there is insufficient combustion air in the room or closet that its in. I will agree that the Trane 90% units are one of the best units out there only because they are so easy to install compared other manufactures brands. I can say this there are no bad units just bad installations.
Originally Posted By: rsummers This post was automatically imported from our archived forum.
Blaine I have not installed those brands but as a tech I’ve been to installations where they were supposed to have a intake and exhaust installed where they left out the intake. They wouldn’t operate properly because the vent lengths were not the same length or terminated in the atmosphere.
but as a tech I’ve been to installations where they were supposed to have a intake and exhaust installed where they left out the intake. They wouldn’t operate properly because the vent lengths were not the same length or terminated in the atmosphere.