Work Item
ASTM WK6936

New Test Methods for Fire Resistive HVAC Duct Systems

1. Scope

1.1 These test methods evaluate the fire resistive materials and the HVAC duct systems using the following test methods: surface burning characteristics, non-combustibility, fire resistance, durability, and fire-engulfment with horizontal and vertical through-penetration fire stops. 1.2 These test methods evaluate the ability of a HVAC duct system to resist the spread of fire from one compartment to other compartments when the HVAC duct system is exposed to fire under one or more of the following conditions: 1.2.1 Condition A Fire exposure from the outside of the horizontal HVAC duct system without openings, 1.2.2 Condition B Fire exposure from the outside of the vertical HVAC duct system without openings, 1.2.3 Condition C Fire exposure from the outside with hot gases entering the inside of the horizontal HVAC duct system with openings, and 1.2.4 Condition D Fire exposure from the outside with hot gases entering the inside of the vertical HVAC duct system with openings. 1.3 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 E 119. 1.3.1 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. 1.3.2 Condition B These test methods provide a means for evaluating a vertical HVAC duct system, without openings exposed to fire and outfitted with a horizontal connection, passing through a horizontal fire-separating element. 1.3.3 Condition C These test methods provide a means for evaluating the effect of a horizontal HVAC duct system, with openings exposed to fire that are not equipped with fire dampers, passing through a vertical fire-separating element. 1.3.4 Condition D These test methods provide a means for evaluating a vertical HVAC duct system, with openings exposed to fire that are not equipped with fire dampers and outfitted with a horizontal connection, passing through a horizontal fire-separating element. 1.4 These test methods prescribe a standardized fire exposure for comparing the test results of the fire resistive materials and HVAC duct systems. The results of these tests are one factor in assessing predicted fire performance of HVAC duct systems. Using these test results to predict the performance of actual HVAC duct systems requires the evaluation of test conditions. 1.5 The values stated in inch-pound units are to be regarded as the standard. The SI values given in parentheses are for information only, unless the SI units are used consistently to perform all of the test methods referenced herein. In this case, the SI units will be regarded as the standard and will be used in Section 18, Report. 1.6 The text of these test methods references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the fire test response standard. 1.7 This document specifically excludes evaluating ducts that carry combustibles and commercial kitchen ventilation systems commonly called grease ducts, which are tested in compliance with Test Method E 2336.

Keywords

enclosure material, engulfment test, fire-resistive, fire separating elements, ventilation duct, ventilation duct enclosure system, hose stream

Rationale

Currently there is only one standard to determine the fire resistive capabilities of ventilation ducts, ISO 6944. However, the US model codes do not recognize this standard and require other attributes not currently addressed by ISO 6944.

The title and scope are in draft form and are under development within this ASTM Committee.

Details

Developed by Subcommittee: E05.11

Committee: E05

Staff Manager: Kevin Shanahan

Work Item Status

Date Initiated: 01-12-2005

Technical Contact: John Nicholas

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