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Standard Practice for Determining the Steady-State
Thermal Transmittance of Steel Door and Frame Assemblies

SDI 113-13

1 Purpose

1.1  The purpose of this practice is to establish a standard test specimen size, test conditions and a rating system for determining the thermal transmittance of operable steel door and frame assemblies.

1.2  This practice refers to the standardized thermal transmittance; Ust of an operable steel door and frame assembly installed vertically in the absence of solar and air leakage effects.

1.3  This practice employs the use of ASTM C1363-05, Standard Test Method for Thermal Performance of Building Materials and Envelope Assemblies by Means of a Hot Box Apparatus, ASTM C1199-09e1, Standard Test Method for Measuring the Steady-State Thermal Transmittance of Fenestration Systems Using Hot Box Methods and ASTM E1423-06 Practice for Determining Steady State Thermal Transmittance of Fenestration Systems

2 Test specimen

2.1  Single doors and pairs of doors shall be tested as nominal 3′0″ (914mm) wide x 7′0″ (2134mm) high and 6′0″(1828mm) wide x 7′0″ (2134mm) high openings, respectively.

2.2  The test specimens shall consist of door, frame, weather-stripping system, glazing (if included) and hardware and be fully operable prior to the sealing of the assembly.

Note: ASTM E1423 requires sealing of the test specimen to prevent air leakage.

3  Experimental Procedure

3.1  The specimen shall be tested in accordance with ASTM C1199, C1363 and E1423.

4  Calculation

4.1  The standardized Thermal Transmittance (Ust) shall be calculated per the CTS method described in ASTM C1199.

5  Performance Ratings

Table 1

U-Value
< 1/2 Light
> 1/2 Light
Rating
> 0.46
>0.52
 > 0.57
0
≤ 0.45
≤ 0.51
≤ 0.56
1
≤ 0.43
≤ 0.49
≤ 0.54
2
≤ 0.41
≤ 0.47
≤ 0.52
3
≤ 0.39
≤ 0.45
≤ 0.50
4
≤ 0.37
≤ 0.43
≤ 0.48
5
≤ 0.35
≤ 0.41
≤ 0.46
6
≤ 0.33
≤ 0.39
≤ 0.44
7
≤ 0.31
≤ 0.37
≤ 0.42
8
≤ 0.29
≤ 0.35
≤ 0.40
9
≤ 0.27
≤ 0.33
≤ 0.38
10

6  Report

6.1  The report shall contain the following information:

6.2  A detailed description of the test specimen components, i.e. Door, frame, hardware, glazing and weather-strip that includes model or series numbers.

6.3  If the test specimen is of a size other than that specified in Section 2.1, the reason for the deviation should be noted.

6.4  All of the information specified in Section 9 of test method ASTM C1199.

6.5  A statement affirming that the test was conducted in accordance with this standardized procedure.

6.6  A rating as defined in Table 1.

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