ATLANTA – A proposed addendum open for public comment is part of efforts to combine the American Society of Heating, Refrigerating and Air-Conditioning Engineers’ (ASHRAE’s) two standards on air filter testing. Combining Standards 52.1, Gravimetric and Dust Spot Procedures for Testing Air Cleaning Devices Used in General Ventilation for Removing Particulate Matter, and 52.2, Method of Testing General Ventilation Air-Cleaning Devices for Removal Efficiency by Particle Size, would have several benefits for users, according to Monroe Britt and James Hanley, chairs of the Standard 52.1 and 52.2 committees.
“One benefit would be having a single ASHRAE test standard
for determining the filtration efficiency of HVAC filters,” noted Hanley. “This
would reduce the number of tests needed on a filter. Currently, many filters
are run twice, once for Standard 52.1 and once for Standard 52.2. It also would
allow for one test rig to perform all the needed tests. Existing differences in
the test rig requirements between the two standards make it difficult for one
rig to serve both tests.”
Proposed addendum b would incorporate the Standard 52.1
sections on weight arrestance and dust-holding capacity into Standard 52.2 and
delete some references to Standard 52.1 that occur in Standard 52.2. The
addendum was open for public review until April 30. Also open for review is
proposed addendum a, which revises the first dust-loading step, also known as
the conditioning step, in Standard 52.2.
On a parallel path, the 52.1 committee is working to revise
the 52.1 standard to remove the dust spot efficiency test requirements.
“Whereas this test method has served the air filter industry
well for several decades, the particle size efficiency technology presented in
52.2 provides more direct and useful data than the dust spot efficiency data,”
This revised Standard 52.1 will be submitted
for public review in the fall of 2007. When approved, the 52.1 standard will
become redundant and will no longer be needed.