ASHRAE-90.1-2022- - Page 070

Extracted Content

2. U-factors from Section A8.2 shall be an acceptable alternative for determining compliance with the U-factor criteria for vertical fenestration .
3. U-factors from Section A7 shall be an acceptable alternative for determining compliance with the U-factor criteria for opaque doors .
4. For sectional garage doors and metal coiling doors, ANSI/DASMA105 shall be an acceptable alternative for determining U-factors .

5.8.2.5 Solar Heat Gain Coefficient. SHGC for the overall fenestration area shall be determined in accordance with NFRC 200.

Exceptions to 5.8.2.5:

1. Shading coefficient ( SC ) of the center-of-glass multiplied by 0.86 shall be an acceptable alternative for determining compliance with the SHGC requirements for the overall fenestration area . SC shall be determined using a spectral data file determined in accordance with NFRC 300. SC shall be verified and certified by the manufacturer .
2. SHGC of the center-of-glass shall be an acceptable alternative for determining compliance with the SHGC requirements for the overall fenestration area . SHGC shall be determined using a spectral data file determined in accordance with NFRC 300. SHGC shall be verified and certified by the manufacturer .
3. SHGC from Section A8.1 shall be an acceptable alternative for determining compliance with the SHGC criteria for skylights . Where credit is being taken for a low-emissivity coating, the emissivity of the coating shall be determined in accordance with NFRC 300. Emissivity shall be verified and certified by the manufacturer .
4. SHGC from Section A8.2 shall be an acceptable alternative for determining compliance with the SHGC criteria for vertical fenestration .

5.8.2.6 Visible Transmittance. VT shall be determined in accordance with NFRC 200. VT shall be verified and certified by the manufacturer .

Exceptions to 5.8.2.6:

1. VTannual determined in accordance with NFRC 203 shall be an acceptable alternative for determining compliance with the VT requirements for tubular daylighting devices.
2. For skylights whose transmittances are not within the scope of NFRC 200, their transmittance shall be the solar photometric transmittance of the skylight glazing materials determined in accordance with ASTM E972.

5.8.3 Air Leakage 5.8.3.1 Testing, Acceptable Materials, and Assemblies. Air leakage for materials or assemblies used as components of the continuous air barrier shall be determined in accordance with the test method and minimum air pressure specified in Table 5.8.3.1 and shall not exceed the maximum air leakage specified in Table 5.8.3.1 when complying with the continuous air barrier design and installation verification program in accordance with Section 5.9.1.2. Air leakage shall be determined by a laboratory accredited by a nationally recognized accreditation organization.

5.8.3.2 Fenestration and Doors. Air leakage for fenestration and doors shall be determined in accordance with the test method and minimum air pressure specified in Table 5.8.3.2 and shall not exceed the maximum air leakage specified in Table 5.8.3.2 when complying with the continuous air barrier design and installation verification program in accordance with Section 5.9.1.2. Air leakage shall be determined by a laboratory accredited by a nationally recognized accreditation organization and shall be labeled and certified by the manufacturer .

Exceptions to 5.8.3.2:

1. Field-fabricated fenestration and doors .
2. Metal coiling doors in semiheated spaces in Climate Zones 0 through 6 shall have an air leakage not exceeding 1.0 cfm/ft [2] when tested at a pressure of at least 1.57 psf in accordance with ANSI/ DASMA 105, NFRC 400, or ASTM E283.
3. Products in buildings that are tested and shown to comply with a whole- building air leakage in accordance with Section 5.4.3.1.4.

5.9 Verification, Testing, and Commissioning 5.9.1 Verification and Testing 5.9.1.1 Building Envelope Performance Verification. The building envelope shall be verified in

68 ANSI/ASHRAE/IES Standard 90.1-2022 (I-P)