Air duct heater changes and modifications

A heat insulation layer is wrapped on the outer surface of the shell, thereby reducing the heat loss in the air duct heater. The heat insulation layer is aluminum silicate wool common in the prior art. The upper end of the shell is provided with a lug to facilitate the air duct heater. Lifting.

Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. In this way, if these modifications and variations of the present invention fall within the scope of the claims of the present utility model and equivalent technologies thereof, the present invention is also intended to include these modifications and variations.