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Interpretations for Standard 90.1-2019

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NOTE: All documents linked from this page are in pdf_icon.png PDF-format.

pdf_icon.png Interpretation 90.1-2019-1 -  June 1, 2020 (Refers to the requirements presented in ANSI/ASHRAE/IES Standard 90.1-2019, Section 6 and Table 6.8.1-16, regarding minimum efficiency requirements for heat pump and heat recovery chiller packages.)

pdf_icon.png Interpretation 90.1-2019-2 -  June 1, 2020 (Refers to the requirements presented in ANSI/ASHRAE/IES Standard 90.1-2019, Section 6 and Table 6.8.1-16, regarding minimum efficiency requirements for heat pump and heat recovery chiller packages.)

pdf_icon.png Interpretation 90.1-2019-3 -  June 5, 2020 (Refers to the requirements presented in ANSI/ASHRAE/IES Standard 90.1-2019, Section G3.1.3.7, regarding Appendix G type and number of baseline chillers.)

pdf_icon.png Interpretation 90.1-2019-4 -  June 5, 2020 (Refers to the requirements presented in ANSI/ASHRAE/IES Standard 90.1-2019, Tables 9.4.2-2 and G3.6, regarding Appendix G baseline building exterior lighting.)

pdf_icon.png Interpretation 90.1-2019-5 -  March 31, 2021 (Refers to the requirements presented in ANSI/ASHRAE/IES Standard 90.1-2019, Sections 6.5.3.5 and 6.5.3.5.1, regarding supply air temperature reset.)

pdf_icon.png Interpretation 90.1-2019-6 -  June 9, 2021 (Refers to the requirements presented in ANSI/ASHRAE/IES Standard 90.1-2019, Section 6.5.2, regarding the application of Section 6.5.2 to hospital zones.)

pdf_icon.png Interpretation 90.1-2019-7 -  October 13, 2021 (Refers to the requirements presented in ANSI/ASHRAE/IES Standard 90.1-2019, Section 5.5.4.1, regarding the determination of WWR for use with Tables 5.5-0 to 5.5-8.)

pdf_icon.png Interpretation 90.1-2019-8 -  October 13, 2021 (Refers to the requirements presented in ANSI/ASHRAE/IES Standard 90.1-2019, Table G3.1 #5, Baseline Building Performance column, item (c), regarding Appendix G baseline fenestration modeling requirements.)

pdf_icon.png Interpretation 90.1-2019-9 -  February 6, 2023 (Refers to the requirements presented in ANSI/ASHRAE/IES Standard 90.1-2019, Section 3, regarding the definition of a conditioned space – cooled space.)

pdf_icon.png Interpretation 90.1-2019-10 -  February 6, 2023 (Refers to the requirements presented in ANSI/ASHRAE/IES Standard 90.1-2019 Appendix G requirements applicable to computer rooms.)

pdf_icon.png Interpretation 90.1-2019-11 – June 24, 2023 (Refers to the requirements presented in ANSI/ASHRAE/IES Standard 90.1-2019, Section G3.1.2.5 Exception1, Baseline Building Performance column, item (c), regarding calculation of the average design capacity.)

pdf_icon.png Interpretation 90.1-2019-12 – June 26, 2023 (Refers to ANSI/ASHRAE/IES Standard 90.1-2019 Section 3 definition of indirectly conditioned spaces.)

pdf_icon.png Interpretation 90.1-2019-13 – October 7, 2023 (Refers to the requirements presented in ANSI/ASHRAE/IES Standard 90.1-2019, Section 5.4.1, regarding insulation and Section 11.2(a) and Appendix G, G1.2.1(a).)

Interpretation 90.1-2019-14 – January 30, 2024 (Refers to the requirements presented only in ANSI/ASHRAE/IES Standard 90.1-2019, Section 3.2, 4.1.2, 4.2.1.3, and 5.1.3, regarding roof replacement.)

Interpretation 90.1-2019-15 – January 30, 2024 (Refers to the requirements presented in ANSI/ASHRAE/IES Standard 90.1-2019, Section G3.1.2.6 Exception 2, regarding determining if the proposed design includes an economizer.)

Interpretation 90.1-2019-16 – June 6, 2024 (Refers to ANSI/ASHRAE/IES Standard 90.1-2019, Section 9.1.4, regarding lighting equipment wattage for calculating lighting power.)

 Interpretation 90.1-2019-17 – February 18, 2025 (Refers to the requirements presented in ANSI/ASHRAE/IES Standard 90.1-2019, Sections 8.4.3.2 and 10.4.6.2, regarding the definition of common area as it relates to Residential building.)

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