Direct-fired gas circulating heating system

摘要

A direct-fired gas circulating heating system of the type having a panelled housing (11) provided with at least a fresh air intake opening (17) and a hot air delivery opening (18) and enclosing a burner (20) and a fan assembly (30) is characterized in that the fan assembly (30) is comprised of only one fan (30) and this fan (30) is positioned downstream the burner (20) so as to cause an air flow rate higher than that necessary for supplying the burner (20) so that the exceeding air will dilute the flue gases generated by the combustion in the burner (20).