Standard Test Methods for Fire Resistive Metallic HVAC Duct Systems
|Publication Date:||15 January 2015|
|ICS Code (Ventilation and air-conditioning systems):||91.140.30|
|ICS Code (Fire-resistance of building materials and elements):||13.220.50|
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.
Condition D-Fire exposure from the outside with hot gases entering the inside of the vertical HVAC duct system with unprotected openings.
These test methods provide a means for determining the fire-resistance of vertical and horizontal HVAC duct systems, when subjected to the standard time-temperature curve of Test Methods E119.
Condition A-These test methods provide a means for evaluating a horizontal HVAC duct system, without openings exposed to fire, passing through a vertical fire-separating element.
Condition B-These test methods provide a means for evaluating a vertical HVAC duct system, without openings