1 Scope

1.1 These requirements cover fuel burning heating appliances that are provided with or are intended for installation with NO_x emissions reduction equipment.

1.2 These requirements apply to factory-built equipment having inputs of more than 400,000 Btu per hour (117 KW) (firing gas), and/or more than 3.0 gph (11.4 L/h) (firing oil), per individual combustion chamber and/or oil or combination gas-oil burning equipment which require flame failure and other safeguards and which are intended primarily for commercial and industrial installation.

1.3 Equipment covered by these requirements may be operated without a competent attendant being constantly on duty at the burners while the burners are in operation.