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

    SDI 113-23

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    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, Standard Test Method for Thermal Performance of Building Materials and Envelope Assemblies by Means of a Hot Box Apparatus, ASTM C1199, Standard Test Method for Measuring the Steady-State Thermal Transmittance of Fenestration Systems Using Hot Box Methods and ASTM E1423 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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