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Further information can be obtained by referring to the U.S.A. National Fire Protection Association's NFPA96 regulations. These standards have also been adopted by the National Building Code in Canada. AIR SUPPLY Unit shall be located so as not to interfere with proper circulation of air within the confined space. All gas burners require sufficient air to operate. Large objects should not be placed in front of the unit which might obstruct the air flow through the front. Do not obstruct the flow