Mr Fix It Plumbing 4320 Atlantic Ave #230, Long Beach, CA 90807 (562) 988-2454 http://www.mrfixitplumbing.com/ A combustion air opening within an exterior wall of 1-sq.-inch per 4000 Btu rating of drinking water heater is necessary throughout the higher and decreased twelve inches of your enclosure. J&D Plumbing & Heating https://aaronc210ncq6.laowaiblog.com/profile