While ASHRAE 90.1 covers general commercial buildings, is specifically designed for Data Centers and Telecommunications Buildings with a power density greater than 20 W/ft².
This 2025 update reflects the growing importance of sustainability alongside energy efficiency in data center design. ashrae 904 pdf upd
ASHRAE 90.4 covers various aspects of data center design and operation, including: While ASHRAE 90
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Broadened scope to address sustainability metrics like water use and carbon impact. Core Structural Framework ashrae 904 pdf upd