Dual air passage heating apparatus with ceramic heater element

Details Dual air passage heating apparatus with ceramic heater element Dual air passage heating apparatus with ceramic heater element

1981-11-19

1984-07-10

Envall, Jr., Roy N.

Electric heating

Heating devices

Combined with container, enclosure, or support for material...

165 96, 165103, 219202, 219374, 219505, B60L 102, F24H 304, F28F 2702, H05B 304

Patent

active

044594666

ABSTRACT:
An air heating apparatus comprises a auxillary PTC heating element in an air duct lying parallel to the length of the duct to define first and second air passages separated by the heating element. The PTC heating element has apertures through which passes air to be heated; the two air passages thereby communicating with each other by means of the apertures through the heating element. First and second valves are located at upstream and downstream ends of the first and second air passages for selectably closing and opening the upstream and downstream ends of the first and second air passages, respectively.

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patent: 4406214 (1983-09-01), Sakurai

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