Specifications: -Gas type: LP(Cylinder) -Mixing Tube OD: 1-1/2" (38mm) -CFH*: 4.5 -BTU Output*: 10,980 -Overall Height: 8-1/2" (216mm) *Note: CFHs and BTU Outputs are figured on: 5 inch Water Column Pressures for Artificial and Natural Burners. 11 inch Water Column Pressures for LP Burners. Inlet OD for all Burners: 5/16" Serrated When an extremely hot flame is required, these Meker-type burners form uniform blue cones of intese heat with no backflashes. Onepiece, nickel-plated venturi tube. Die cast, zinc alloy, nickel plated octagonal base.