ASTM International

Standard Test Methods for Fire Resistive Metallic HVAC Duct Systems
 N E2816 REV A

Annotation

NOTE 1—Use of the standard designation ISO 6944 refers to both ISO 6944:1985 and ISO 6944-1:2008.

These test methods evaluate the fire-resistive materials and the HVAC duct systems surface burning characteristics, non-combustibility, fire resistance, durability, and fireengulfment with horizontal and vertical through-penetration firestops.

NOTE 2—The intent of these test methods is to provide authorities having jurisdiction a means to evaluate the fire performance of HVAC duct systems to enable their application and use.

These test methods evaluate the fire performance of HVAC ducts, including both supply (pressurized: Condition A – Horizontal and Condition B – Vertical) and return (exhaust: Condition C – Horizontal and Condition D – Vertical).

These test methods evaluate the ability of a HVAC duct system to resist the spread of fire from one compartment to other compartments separated by a fire resistance rated construction when the HVAC duct system is exposed to fire under one or more of the following conditions:

Condition A—Fire exposure from the outside of the horizontal HVAC duct system without openings,

Condition B—Fire exposure from the outside of the vertical HVAC duct system without openings,

Condition C—Fire exposure from the outside with hot gases entering the inside of the horizontal HVAC duct system with unprotected openings, and

NOTE 3—Unprotected openings are openings that are not protected by fire dampers.