ASHRAE standards are typically updated on a five-year cycle. While the 70-2006 version is technically superseded, you may still find it referenced in older project specifications.

Measuring noise levels generated by air terminal devices.

It is important to note that while 2006 was a foundational version, ASHRAE has since released newer editions (most notably ).

ASHRAE provides Read-Only Versions of many standards for public viewing, though printing or downloading usually requires a purchase.

Redefines test facilities and installation procedures to better align with how these devices are actually used in contemporary buildings. Calculation Methods:

: Clarifies data calculation methods to accommodate modern equipment. Where to Access

The transition from the 2006 (RA 2021) version to the 2023 standard introduced several critical changes for HVAC engineers and manufacturers:

The 2023 edition introduces several major changes compared to the 2006 version: Expanded Scope

Acoustic performance yields Noise Criterion (NC) values. Testing isolates the sound power generated purely by air passing through the device geometric frame, independent of background building noise. 3. Throw and Air Pattern

: The full PDF is available for purchase through the ASHRAE Bookstore or the ANSI Webstore .

ASHRAE Standard 70 defines how manufacturers must test devices used to terminate ducted and unducted building air distribution systems. The guidelines ensure that catalog data from different manufacturers can be directly compared. The standard evaluates key performance characteristics under both isothermal (equal temperature) and non-isothermal conditions. Key Performance Metrics Measured

The maximum vertical distance that the centerline of a horizontally projected airstream drops below the device's horizontal axis.