Ashrae 90.4 Pdf [updated] Jun 2026

While traditional buildings follow ASHRAE 90.1 , 90.4 serves as its "sister standard," specifically tailored for the unique, mission-critical load requirements of high-density computing environments. ASHRAE 90.4 applies specifically to facilities where: Power Density is greater than 20 W/ft². IT Equipment (ITE) Load exceeds 10 kW.

Here are some key points to consider:

The MLC allowance can be very tight for small facilities because overhead doesn't scale linearly. Solution: The standard allows a "simplified approach" using packaged equipment with listed efficiencies. ashrae 90.4 pdf

You cannot get it for free (legally). ASHRAE protects its IP aggressively. While traditional buildings follow ASHRAE 90

: Many university libraries and engineering firms provide access to these standards through subscriptions like IEEE Xplore or Techstreet [9]. used in the latest version? While traditional buildings follow ASHRAE 90.1