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MIL-F-80089 Revision B, September 30, 1986
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FURNACES, HEAT-TREATING, GAS-FIRED, BOX-TYPE, DIRECT-FIRED AND FULL-MUFFLE DESIGN
Includes all amendments and changes through Cancellation Notice 1, May 18, 1999
Additional Comments: CNCL NO S/S
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This specification covers horizontal box-type, gas-fired, heat-treating furnaces of the directly fired and full-muffle design with equipment and accessories specified herein.

The furnaces shall be of the following types, classes, and sizes. The type, class, and size to be furnished shall be as specified (see 6.2.1).
    Type I  - Direct fired
      Class 1 - 600 degrees F to 2000 degrees F
                operating temperatures.

      Class 2 - 1200 degrees F to 2500 degrees F
                operating temperatures.

    Type II - Full muffle
      Class 1 - 1400 degrees F to 2000 degrees F
                operating temperature.

      Class 2 - 1800 degrees F to 2500 degrees F
                operating temperature.


Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Defense Industrial Plant Equipment Center, ATTN: DIPEC-SSM, Memphis, Tennessee 38114-5297, by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.

The inside working dimensions of the furnace should be selected from the size listed in table I for the type furnace required. Dimensions specified shall be minimum inside rectangular working dimensions. The length shall be the inside heated portion of the hearth, and shall not include the insulation thickness of the door opening. TABLE I. Furnace size in inches.
Type I                   Type II
    --------------------------------------------------
    Width   Length   Height   Width   Length   Height
    --------------------------------------------------
     12       18        7        8      15        6

     12       24        7       12      21        9

     12       36        7       12      36        9

     15       24       10       17      25       12

     15       36       10       20      42       10

     15       48       10       22      41       14

     18       24       12

     18       36       12

     24       36       20

     24       48       24