AC-83-04-1 -- Results of Multilaboratory Testing of Air-Diffusion Devices ✓ Most Recent

This paper reports the results of the multilaboratory testing of typical air-diffusing devices, such as circular ceiling diffusers and mixing boxes. Data are presented on the agreement of test results among laboratories and over a period of time. Correlating equations are also presented for pressure drop and sound power generation as functions of flow rate for both diffusers and mixing boxes. Standard test procedures, as promulgated by the Air Diffusion Council Test Code 1062-R4, were used for all tests.

The principal thrust of this paper concerns the consistency of test results among certified laboratories, including an independent one, and is intended to provide answers to three questions:

1. How consistent are the data from the standard devices, using standard test procedures, over time?
2. How consistent are the data from the various laboratories, both in-house and independent, using standard test procedures on the standard devices?
3. How may the data, particularly from sound tests, be correlated to provide both "smooth-ing" to reduce experimental error and to produce intermediate results, i.e., sound power and pressure requirements, at flow rates not actually tested?