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07-31-2009, 06:36 PM #1
B-vent sizing with multiple appliances
Customer has existing nat gas furnace with 90k input and existing hot water heater....don't know input, but assume roughly 40k input.
Same customer is putting in a new tankless Bosch...with output of 91k btus. They are considering new furnace with output of 80k btu max. So total output with the new tankless of 171k btus.
Is 5" b-vent sufficient...assuming it's verticle height is 20' or less?