Abstract: 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.

Abstract: 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.