Addenda revising the heating, ventilating and air conditioning section of ANSI/ASHRAE/IESNA Standard 90.1-1999, "Energy Standard for Buildings Except Low-Rise Residential Buildings," have been approved for publication.

In total, 16 addenda, which consist mainly of minor editorial changes according to ASHRAE, were approved for publication. The standard is being revised through the continuous maintenance procedure.

Another addendum clarifies requirements for equipment-related particulate filtration for ventilation standard 62-1999, "Ventilation for Acceptable Indoor Air Quality," has also been recommended for publication. That standard sets minimum ventilation rates and other requirements for commercial and institutional buildings.

The filtration requirements in addendum "s" are intended to reduce the rate of dirt accumulation on ventilation system components that are likely to become wet, such as cooling coils. Dirt accumulation on wet surfaces could lead to microbial growth.

A new standard, "Methods of Testing Hvac Air Ducts," also has been published. It can be used to determine hvac air duct structural strength, dimensional stability, durability and leakage characteristics. Tests simulate structural stresses and conditions that ductwork will see in service.