: While 90.4 handles the specialized mechanical and electrical systems of a data center, it relies on Standard 90.1
Need the exact addenda list for 90.4-2021? Search “ASHRAE 90.4 addenda” on their website – they are free to download after purchasing the base standard. ashrae 904 pdf upd
“UPD” typically refers to an update or a more recent edition of the standard. As of the latest ASHRAE handbook cycles, there is no standalone standard numbered “904.” The most likely intended document is ASHRAE Standard 90.4 (Energy Standard for Data Centers) or ASHRAE Guideline 14 (Measurement of Energy, Demand, and Water Savings). However, based on common search patterns and numbering confusion, many users mean ASHRAE Standard 90.4-2021 (or later updates) when typing “904.” : While 90
ASHRAE 90.4 is a standard that focuses on the energy-efficient design and operation of data centers. The standard provides guidelines for data center owners and operators to reduce energy consumption, minimize environmental impact, and ensure reliable operation. The standard covers various aspects of data center design and operation, including: As of the latest ASHRAE handbook cycles, there
: Applies to facilities with IT equipment loads greater than 10 kW and power densities over 20 W/ft² .