Ashrae 90.4 Pdf Link -

For years, data centers lived under the umbrella of ASHRAE 90.1 (the standard for commercial buildings). But data centers aren't office buildings. They don't care about keeping corner offices at 72°F (22°C); they care about keeping servers online without melting the power grid.

The safest source is the (www.ashrae.org). ASHRAE 90.4-2022 is available as: ashrae 90.4 pdf

Here are some key points to consider: