US PATENT SUBCLASS 110 / 175 R
.~ Feeding air

Current as of: June, 1999
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110 /   HD   FURNACES

173 R  DF  DOORS {7}
175 R.~ Feeding air {1}
175 A  DF  .~.~> Automatic door dampers

Unofficial Alpha Subclasses: R A

DEFINITION

Classification: 110/175

(under subclass 173) Doors which admit air to the furnace either by ports or conduits through the door structure or having means for keeping the door partly open where the construction is especially adapted for admitting air other than by simply opening a door of common construction.

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