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Installing a condensing tankless water heater and I am direct venting out the side of the house... I know code for pipe terminations is that vent and air intake pipe must be minimum 3’ from an inside corner. Does this apply to a chimney as well? I was planning on terminating about 2ft from a chimney that bumps off the house approximately 18” or so but will have to rethink my plan if this will cause an issue.