MEP Engineering · Engineering Glossary
ASHRAE is the professional society that publishes the standards governing HVAC, refrigeration, building energy performance, and indoor air quality used throughout the engineering and construction industry. Key ASHRAE standards include 62.1 (ventilation), 90.1 (energy efficiency), and 55 (thermal comfort).
ASHRAE 62.1 specifies minimum outside air ventilation rates for commercial buildings and is referenced by the IBC and most mechanical codes as the ventilation standard. ASHRAE 90.1 is the model energy standard for commercial buildings adopted in most states not using Title 24, setting efficiency minimums for HVAC, lighting, and the building envelope. ASHRAE Standard 55 defines the conditions for acceptable thermal comfort in occupied spaces. ASHRAE also publishes the Handbook of Fundamentals and HVAC Applications, which are the primary engineering references for load calculations, duct design, and system selection. Apex Grid's mechanical engineers apply ASHRAE standards on all commercial HVAC projects.
Apex Grid Engineering maintains this glossary as a resource for architects, contractors, developers, and property owners who encounter unfamiliar engineering terminology on their projects.
View All Engineering TermsApex Grid's licensed PEs provide mep engineering services across multiple jurisdictions — with fast quote turnaround and permit-ready documents.
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