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146 SECTION 3 - 3.2 The air iJitake on power burners must be protected with means to prevent accidental closure by debris being pulled over inlet by suction of blower. SECTION 3 - 3.3 The burner or burners shall be located according to the manufacturers' instructions and shall be so secured that they will not slide, twist or drop out of position. SECTION 3 - 3.4 The burner or burners shall be so installed as to be readily accessible for cleaning and inspection. SECTION 3 - 3.5 The burner or burners shall be so installed that no part of flame shall impinge on heating surface so as to cause incomplete combustion. SECTION 3 - 3.6 On all pre-mix power burners an approved type of check valve shall be installed in the gas supply line to prevent back flow of air into the gas line. SECTION 3 - 3.7 Burners shall be sized according to the BTU rating shown in the regularly published literature of the burner manufacturer, and under no conditions shall it be permissible to alter the burner so as to exceed the rated maximum BTU input. Before the permit for installation of a burner is issued, the burner manufacturer shall furnish the Gas Inspector with a certified copy of the literature showing capacity of burner, spud size and draft loss across the burner for the maximum ratings at the various pressures. SECTION 3 - 4 PLAIN PILOTS: ., Each burner shall be equipped with a plain gas pilot or pilots in addition to the safety pilot to insure smooth lighting of the burner so that there will be no rollback or heavy detonations during lighting off period except that where the burner unit is of such size that safety pilot only will light burner smoothly, the plain pilot may be omitted. The pilot flame shall effectively ignite the gas at the burner and shall be so designed as to be adequately protected from drafts. Pilot flames shall not become extinguished during the operation of the main burners nor by starting or stopping them in a normal manner. Luminous flame pilots shall not show carbon deposit during the period of tests when adjusted according to the manufacturer's instructions. SECTION 3 - 4.1 Where the vertical or upshot type of burner consisting of a multiplicity of heads is used, a minimum of one plain gas pilot for each eight heads must be used. In arriving at the number of pilots, the safety pilot will be counted as one plain gas pilot above eight heads; below eight heads there must be at least one plain gas pilot and a safety pilot unless the Gas Inspector approves a lesser number.