Direct-fired ductable heater

Details Direct-fired ductable heater Direct-fired ductable heater

F - Mech Eng,Light,Heat,Weapons

24

H

F24H 3/04 (2006.01) F23D 14/78 (2006.01) F24H 9/12 (2006.01) F24H 9/18 (2006.01)

Patent

CA 2638435

A direct-fired heater suitable for connection to duct work is disclosed. The heater comprises an outer shell comprising an inlet for allowing inlet of air to be heated and an outlet for exhausting heated air. A fan blade is operatively connected to a fan motor for operating the fan blade. The heater also comprises a combustion chamber defined by a combustion chamber wall, a burner plate at one end proximate the fan blade and an exhaust plate at an opposite end, the bumer plate having openings therein for allowing airflow into the combustion chamber and the exhaust plate have an opening therein for allowing exit of heated exhaust from the combustion chamber, the combustion chamber wall extending past the bumer plate. A first airflow zone exists between the outer shell and the combustion chamber allowing airflow between the fan blade and the outlet in the outer shell. An injector for injecting gas into the combustion chamber in proximity to the openings in the bumer plate is used. The heater also comprises a nose cone between the outlet in the outer shell and the exhaust plate, the nose cone positioned to allow airflow through the exhaust plate and out of the outlet. The burner plate is located in a position proximate the fan blade suitable to cause recirculation of air blown by the fan blade to cool the injector and bumer plate during operation of the heater.

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