Air duct

Automatic temperature and humidity regulation – Mixing fluid of dissimilar temperature – Plenum type

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Details

236 49, 237 55, G05D 2300

Patent

active

047307714

ABSTRACT:
This invention provides a device for meeting the demand of a forced-air furnace for make-up air in a building, the make-up air being available from a duct leading from outside the building. The device takes warm air from the hot air plenum of the furnace and returns the air to the return air plenum. This flow of air is caused by a differential pressure between the two ducts when the furnace is operational and operates a valve element which normally closes the duct carrying outside air and opens to permit flow of this air in response to the passage of warm air between the hot air and return plenums.

REFERENCES:
patent: 3009643 (1961-11-01), Dibert

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