The ASHRAE Standard 70-2006 PDF updated is available for download from the ASHRAE website. You can purchase the standard online or download a free preview copy.
After a standard is published, ASHRAE periodically reviews it to ensure it is still technically valid. If no significant changes are needed, the standard is "reaffirmed."
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While Standard 70 establishes the method of testing , the commercial HVAC industry largely relies on the for the actual certification programs. AHRI Standard 880 governs air terminals.
While the core testing methodologies for air distribution are robust, the 2021 reaffirmation confirms that the standard remains the active standard for laboratory testing of terminal devices. It maintains the 2006 requirements for test instruments, facilities, and procedures, ensuring industry continuity. The ASHRAE Standard 70-2006 PDF updated is available
The standard now covers a wider range of air-device types and sizes, specifically including displacement ventilation and underfloor outlets .
Essentially, if you are selecting a diffuser for a conference room and need to know its throw, drop, and sound power level, the data you are looking at was likely generated using the protocols set in Standard 70. If no significant changes are needed, the standard
The distance the air stream travels and its vertical descent.