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1897 EDITION <br /> TABLE 10-6C <br /> TRANSMISSION COEFFICIENTS'(U)'FORWOOD AND STEEL DOORS <br /> .Btu/h•ft <br /> .. , a•..p. . <br /> ... ,, ._.., ...... . i <br /> Nominal „ No Wood Matal <br /> Door Description Storm Storm Storm <br /> Thickness. _._-.._. . . ._.- Door. .. Doorc Doord <br /> Inches <br /> Wood Doors' _ <br /> 1.3/8 Panel door with 7/16 inch pansle - 0.57 0.33 0.37 <br /> 1-3/8 Hollow core Flush door 0.47 . 0.30 0.32 . i <br /> ... <br /> 1-3/8 Solid core flush door � "-•- - ......_ 0.39 0.26 0.28 <br /> 1-3/4 Panel door with 7/16 inch panele - 0.57 0.33 0.36 <br /> 1.3/4 Hollow core flush door - 0.46 0.29 0.32 <br /> 1-3/4 Panel door with 3/4 inch panels. 0.40 0.27 0.29 <br /> 1-3/4 . Panel door with 1-1/8 inch els' - " 0.39 0.26 0.28 <br /> 1-3/4 Solid core flush door - " 0.33 0.28 0.25 <br /> 2.1/4 Solid core flush door 0.27 0.20 0.21 <br /> Steel Doors' <br /> 1-3/4 Fiberglass or mineral wool core with steel stiffeners, 0.60 - - <br /> uo thermal breakf <br /> 1-3/4 Pacer honevcomb core without thermal break' 0.56 <br /> 1-?14 Solid urethane foam core without thermal break' 0.40 - - <br /> I-3/4 Solid fire rated mineral fiberboard core 0.38 --- <br /> without thermal break' <br /> 1-3/4 Polystyrene core without thermal break 0.35 <br /> (18 gage commercial steel)' <br /> 1-3/4 Polyurethane core without thermal break 0.29 --- <br /> (18 gage commercial steel)' <br /> 1-3/4 Polyurethane core without thermal break 0.29 --- - <br /> (24 gage commercial steel)' <br /> 1-3/4 Polyurethane core with thermal break&wood perimeter 0.20 - <br /> 24 gage commercial steep' <br /> 1-3/4 1 Solid urethane foam core with thermal break 0.19 0.16 0.17 <br /> NOTE: All U-factors for exterior doors in this table are for doors with no glazing, except for the storm doors which are in <br /> addition to the main exterior door. Any glazing area in exterior doors should be included with the appropriate glass type and <br /> analyzed. Interpolation and moderate extrapolation are permitted for door thicknesses other than those specified. <br /> a. Values are based on a nominal 32 by 80 in. door size with no glazing. <br /> b. Outside air conditions: 15 mph wihd speed, OOF air temperature; inside air conditions: natural convection, 70OF air <br /> temperature. <br /> c. Values for wood storm door are for approximately 50% glass area. <br /> d. Values for metal storm door are for any percent glass area. <br /> e. 55 Fo panel area. <br /> f. ASTM C 236 hotbox data on a nominal 3 by 7 ft door size with no glazing. <br /> The U-factors in Table 6C are for exterior wood and steel doors. The values given for wood doors were calculated, and those for <br /> steel doors were taken from hotbox tests(Sabine et al. 1975: Yellot 1965) or from manufacturer's test reports. An outdoor <br /> surface conductance of 6.0 Btu/h,ft -OF was used, and the indoor surface conductance was taken as 1.4 Bru/h•fr•'F for vertica <br /> surfaces with horizontal beat flow. All values given are for exterior doors without glazing. If an exterior door contains giving, <br />' refer to Table 10-6D. <br /> Effective 7/01198 61 <br />