| 摘要 |
A controlled air intake apparatus for a furnace includes a substantially flat cover plate attached to and placed over the updraft opening of the flue and a generally rectangular housing attached over the air intake opening adjacent the burner region. The housing includes a first open side and opposite thereto a side including a plurality of apertures. The remaining sides of the housing are enclosed. The first plurality of apertures are disposed into two rows and the housing further includes a cover plate with a similar arrangement of apertures. The cover plate is slidably received by the housing and is movable by means of a solenoid between an aperture-closed orientation and an aperture-open orientation. The solenoid responds to the thermostat which also controls the furnace energizing and deenergizing such that when the furnace is turned on the cover plate is moved to a position wherein the first plurality of apertures are in alignment with the second plurality of apertures enabling the introduction of combustion air into the furnace. When the furnace is deenergized, the solenoid is also deenergized and a spring return feature brings the cover plate back into an orientation wherein the plate covers the apertures in the housing.
|
