.~ With heater-unit housing, casing, or support means (e.g., frame and single sheet) {13}
531
.~.~ With thermal insulation or cooling means
DEFINITION
Classification: 219/531
(under subclass 520) Subject matter wherein the significant housing, casing or support structure includes thermal insulation or other means whereby unwanted heat is dissipated or prevented form effecting at least some portion of the housing, casing or support means.
SEE OR SEARCH THIS CLASS, SUBCLASS:
460, for planar surface heater with heating unit support with thermal insulation or ventilating means.
540, for heating element for heat transfer plate or fins.
542+, for resistive element with particular electrical insulation means.
SEE OR SEARCH CLASS
338, Electrical Resistors, 51+, for resistors, per se, combined with heat dissipating vanes and subclasses 53+ for resistors combined with cooling gas or liquid circulation.
