agstaff
New Member
Have been reading threads here for some time, and everyone has been most helpful in many projects. Currently insulating my attic and was getting ready to insulate around my b-vent when I noticed it seemed larger than need be. Went down in the basement and looked and here is my setup:
80% 66,000 btu fan assisted Bryant furnace, 3' single wall connector, 2 elbows, no horizontal runs
40 gallon, 40,000 btu with draft hood, 2' single wall connector, 2 elbows, no horizontal runs
Both the furnace and water heater vent through 4" single wall pipe to a 6x5x4 sheet metal wye. The 5" outlet has a 4" reducer that connects to the furnace. The 6" end of the wye then connects to a 6" b vent that travels straight up, no offsets, through a wall chase and through the roof where it terminates, approximately 16'-17'.
From all the sizing guidelines I have read, it looks like I should be running a 4" b-vent connector from the furnace and can use a 4" double wall for the common vent up through the roof. I currently have 6" b-vent for my common vent. Will this cause problems with condensation and furnace efficiency? If I'm going to fix it I want to do it right!
Any help is much appreciated!
Thank you to all in advance.
80% 66,000 btu fan assisted Bryant furnace, 3' single wall connector, 2 elbows, no horizontal runs
40 gallon, 40,000 btu with draft hood, 2' single wall connector, 2 elbows, no horizontal runs
Both the furnace and water heater vent through 4" single wall pipe to a 6x5x4 sheet metal wye. The 5" outlet has a 4" reducer that connects to the furnace. The 6" end of the wye then connects to a 6" b vent that travels straight up, no offsets, through a wall chase and through the roof where it terminates, approximately 16'-17'.
From all the sizing guidelines I have read, it looks like I should be running a 4" b-vent connector from the furnace and can use a 4" double wall for the common vent up through the roof. I currently have 6" b-vent for my common vent. Will this cause problems with condensation and furnace efficiency? If I'm going to fix it I want to do it right!
Any help is much appreciated!
Thank you to all in advance.