doors fabricated in accordance with Commercial Stan- dard CS 73-48 as published by the United States De- partment of Commerce. Doors shall be of panel-andframe construction including those indicated as flush. Doors shall be mortised-and-tenoned or doweled, glued; water-proof shall be furnished shall be furnished tory sealed on all sealer-prime coat. ¢. and glue shall be used. Double doors with astragal attached. All doors smoothly sanded and shall be facends, edges and faces with a resin Screen doors shall be furnished and installed where indicated or directed. Screen doors shall comply with all applicable provisions of paragraph b, preceding and shall be covered with plastic mesh screening. Plastic mesh screening shall be of a type that has successfully met tests for accelerated weathering, salt spray, tropical chamber and water absorption as made by a reputable laboratory; shall have a softening point of not less than 240 degrees F.,a tensile strength of 40,000 pounds per square inch and shall be 18 x 14 d. mesh, color gray. Louvers shall be of types and materials de- tailed and shall be set in suitable frames. Louvers shall be screened on interior faces where directed with plastic mesh screen as hereinbefore specified. Metal louvers as specified in "Miscellaneous Equipment and Furnishings” section of these specifications shall be installed as indicated. e. Insulation shall be provided for doors at f. Door frames shall be of dimensions and con- Building 221, Location "B" as detailed. Insulation shall conform to paragraph 8-18 that follows. struction as detailed on plans with stops nailed on. Frames shall be set plumb and square and properly secured. g. Erection: Unless otherwise shown or direct- ed, doors shall be hung and fitted to a 1/8 inch clear- ance at top and sides, and 3/8-inch clearance at the bottom and shall have 1-1/2 pair of hinges per door. Door hardware shall be as hereinafter specified. 8-11. WINDOW SASH: All sash, unless otherwise noted, shall be job-built to the designs and dimensions shown from material specified in paragraph 8-02c. Screen 8-11