Ashrae 90.4 Pdf Jun 2026

Because IT load is variable and mission-critical, 90.4 sets allowances for mechanical and electrical losses rather than dictating a simple PUE (Power Usage Effectiveness) number.

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. ashrae 90.4 pdf

Once you have the official PDF, follow this engineering workflow: Because IT load is variable and mission-critical, 90

It covers new data centers, additions to existing facilities, and major alterations that require new mechanical or electrical systems. 90.4 serves as its "sister standard