NADCA releases revised duct-cleaning standard
The National Air Duct Cleaners Association has released the 2006 edition of Assessment, Cleaning & Restoration of HVAC Systems.
According to NADCA, the standard replaces the 2005 version and it is the most comprehensive version published by the association.
Included in the standard is a protocol for cleaning coils and detailed requirements for the installation of service openings in HVAC systems. The most extensive addition to the standard is the new protocol for cleaning coils. Section 7, "Coil Surface Cleaning," combines a series of inspections with "Type 1" and "Type 2" cleaning methods, depending on the severity and types of contamination on the coils.
Type 1 methods deal with removal of loose debris, while Type 2 methods are appropriate for removing sticky particulate matter. The standard also provides methods for measuring the effectiveness of coil-cleaning efforts, including static-pressure drop, according to NADCA.
The revised edition of the standard is available free on the NADCA Web site,www.nadca.com.