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WW-F-2743 Revision A, May 27, 1998
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This specification covers self-contained, forced-circulation, air heating units designed to distribute warm air for heating purposes either through a duct system for central furnaces or by direct diffusion for unit heaters.

Types, styles, groups, and burner kinds.

The heating units will be of the following types, styles, groups, and burner kinds, as specified (see 6.2):
    Type I -Central furnace.
    Type II - Unit heater.

    Style A - Upflow, high-boy.
    Style B - Upflow, low-boy.
    Style C - Downflow.
    Style D - Horizontal flow.

Beneficial comments, recommendations, additions, deletions, clarifications, etc. and any data which may improve this document should be sent to: Commanding Officer (Code 15E2), Naval Construction Battalion Center, 1000 23rd Avenue, Port Hueneme, CA 93043-4301, by using the Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.

For the purpose of defining requirements, the furnaces and space heaters covered by this specification are classified under the following groups based on the thermal input in British thermal units per hour (Btu/hr (watt (W)) (see 3.8.1 and 6.2).
    Group 1 - 22,000 to 225,000 Btu/hr (6 448 W) to 65 940 W) input.
    Group 2 - 225,001 to 400,000 Btu/hr (65 941 W to 117 228 W) input.
    Group 3 - Over 400,000 Btu/hr (117 228 W) input.

Burners furnished on the furnaces and unit heaters will be of the following kinds, as specified (see 6.2). (Burner kinds HO, GLO, and GHO will apply to group 3 units only.)
    Burner kind LO  - Light-oil-fired (grade 2).
    Burner kind G   - Gas-fired (natural, manufactured, mixed, or liquefied petroleum gas), as
                      specified (see 6.2).
    Burner kind HO  - Heavy-oil-fired (grade 4).
    Burner kind GLO - Combination gas-and light-oil-fired.
    Burner kind GHO - Combination gas - and heavy - oil - fired (grade 4).