The gas-fired furnace and hot water heater are located in a garage closet. Zero air-intake source from the garage. Took me a while to figure out why the furnace's exterior air intake flue pipe had been *tee'd* with an open-end pipe stub. Do you know why?
source https://www.inspectorsjournal.com/topic/18578-atypical-open-tee-installed-on-furnace-intake-air-flue-pipe/?do=findComment&comment=166701
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