US PATENT SUBCLASS 110 / 157
.~.~ Feeding air

Current as of: June, 1999
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110 /   HD   FURNACES

147  DF  DRAFT REGULATORS {5}
150  DF  .~ Steam injector {1}
157.~.~ Feeding air {1}
158  DF  .~.~.~> Door operated

DEFINITION

Classification: 110/157

(under subclass 147) Devices for admitting air to the smokebox or base of stack to retard the draft.

SEE OR SEARCH CLASS

96, Gas Separation: Apparatus,

372+, for gas separation apparatus including inlet means for diverse gas or solid for gas treatment.