Ashrae 904 Pdf Upd Jun 2026

: While 90.4 handles the specialized mechanical and electrical systems of a data center, it relies on Standard 90.1

Where:

The 2022 update revises the maximum allowable mechanical load component (MLC) and power distribution losses based on 0.5% and 1% annual cooling bin data. New climate zone data incorporates recent weather years (1995–2014) replacing older TMY3 data, resulting in more realistic allowable PUE targets, especially in humid and hot-dry climates. ashrae 904 pdf upd

You can buy the full, downloadable PDF from the ASHRAE Bookstore. ⚠️ A Note on "PDF Updates" : While 90