Many engineers and students mistakenly write “ASHRAE 904” because:
Measures the energy losses within the electrical distribution system, including UPS systems and transformers. Key Updates in the 2022 Edition ashrae 904 pdf upd
If you meant (likely, given "904"), here is interesting, current content about its latest updates: here is interesting
Historically, data center cooling design was shackled to rigid prescriptive metrics (e.g., specific economizer hours). The updated 90.4 standard refines the Mechanical Load Component (MLC) calculations. look for these chapters:
The landscape of data center design is shifting rapidly. With the release of and recent addenda to the 2022 version, the industry is moving beyond simple power metrics toward a more holistic view of sustainability.
If you are searching for specific sections within the PDF, look for these chapters: