Some jurisdictions (e.g., the U.S. Green Building Council or specific state energy offices) host "read-only" versions for reference. However, these are usually watermarked and not printable.
This section lists other standards you need to read alongside 90.4 (e.g., ANSI/ASHRAE Standard 34 for refrigerant safety, IEC 60364 for electrical installations).
A: Yes. The LEED v4.1 BD+C Data Centers credit uses ASHRAE 90.4 as the baseline for optimizing energy performance. ashrae 90.4 pdf
Compliance requires that data centers have permanent monitoring systems capable of measuring IT load, mechanical power, and electrical power. You cannot comply on paper alone; you must demonstrate operational compliance.
Many newcomers confuse 90.4 with 90.1. Here is the distinction: Some jurisdictions (e
| Feature | ASHRAE 90.1 | ASHRAE 90.4 | | :--- | :--- | :--- | | Target Building | Commercial buildings (offices, malls, hotels) | Data centers, server rooms, telecom facilities | | Focus | Envelope, lighting, HVAC, service water heating | IT equipment cooling and power delivery efficiency | | Key Metric | Energy Cost Budget (ECB) & Prescriptive packages | Mechanical Load Component (MLC) & Electrical Loss Component (ELC) | | Climate Handling | Climate zones (1-8) | Specific data center climates (based on dry-bulb temperature) |
When you finally open an ASHRAE 90.4 pdf, you will find it organized into several critical sections. Understanding these sections is key to compliance. This section lists other standards you need to
Using the formulas in Section 6.3, calculate: Total mechanical power (kW) = Chiller + CRAH fans + Condenser pumps + Cooling tower + Drycooler. Divide this by your Critical IT Load (kW) from the nameplates of your servers.