Selas Duradiant Threaded Semi-Furnace burners mount easily to refractory walls. They are designed for mounting into vertical refractory walls or panels where 4-1/2″ (114mm) thick wall construction is acceptable for service, where input capacity of the Series 51 tip is adequate, and when work temperatures generally do not exceed 1600° to 1800°F (870° to 980°C). All critical metallic parts are fabricated of heat resistant alloy steel. Each burner block is threaded to receive the hub of the cast iron burner body. Two series of burners are available:
(1) Series 551, with flanges which overhang the burner blocks for bolting to steel casings or frameworks.
(2) Series 552, with flanges small enough to permit close nesting of burners.