These units are part of the RE6000 series of power gas burners and feature a retention head design which shapes the flame into a compact and efficient flame pattern which concentrates heat to the most efficient heat exchange surfaces. These units are built to service a large variety of applications and can also be customized to meet the OEM’s specific requirements. The universal mounting flange makes for quick and simple installation and the bi-directional manifold and compact design allows OEMs to lower their burner inventory. Units are constructed of sheet metal. The 6700B unit has a minimum input rating of 275,000 BTU/hr. and a max. input rating of 700,000 BTU/hr. Both the 6850 and 6850B have a min. input rating of 275,000 BTU/hr. and a max input rating of 825,000 BTU/hr.