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-square-inch for every 4000 Btu rating of h2o heater is needed within the upper and lower 12 inches in the enclosure. Keep the pump operating https://longbeachcaplumber46891.corpfinwiki.com/8413863/the_long_beach_plumbing_diaries