Standard Test Methods for Fire Resistive Metallic HVAC Duct Systems

Importancia y uso:

5.1 These test methods are intended to evaluate the ability of the HVAC duct system and its supporting construction to do the following:

5.1.1 Resist the effects of a standardized fire exposure, and

5.1.2 Retain its integrity.

5.2 These test methods provide for the following measurements and evaluations where applicable:

5.2.1 Ability of the tested support system to carry the load of the HVAC duct and its fire-resistive material(s) during the entire duration of the standardized fire-engulfment test.

5.2.2 Ability of the firestops to meet the requirements of Test Method E814 when used as part of a HVAC duct system.

5.2.3 Ability of the HVAC duct system to resist the passage of flames and hot gases onto its unexposed surface during a standardized fire-resistance test.

5.2.4 Transmission of heat through the HVAC duct system during a standardized fire-resistance test.

5.2.5 Ability of the firestop to resist the passage of water during a standardized hose stream test.

5.3 These test methods do not provide the following:

5.3.1 Full information as to performance of the fire-resistive material, supporting construction, or the HVAC duct system constructed with components, densities, or dimensions other than those tested.

5.3.2 Evaluation of the degree by which the fire-resistive material or HVAC duct system contributes to the fire hazard by generation of toxic gases, or other products of combustion.

5.3.3 Measurement of the degree of control or limitation of the passage of smoke or products of combustion through the HVAC duct system.

5.4 The test specimens are subjected to one or more specific tests under laboratory conditions. When different test conditions are substituted or the end-use conditions are changed, it is not always possible by, or from, these test methods to predict changes to the characteristics measured. Therefore, the results of these laboratory tests are valid only for the exposure conditions described in these test methods.

5.5 These test methods require a test specimen to be exposed to a standard fire that is controlled to achieve specified temperatures throughout a specified time period. The engulfment test is followed by the application of a standardized hose stream test. These test methods provide a relative measure of the fire-test-response of comparable fire-resistive materials and HVAC duct systems under these exposure conditions. The fire exposure is not representative of all fire conditions because conditions vary with changes in the amount, nature and distribution of fire loading, ventilation, compartment size and configuration, and heat sink characteristics of the compartment. Variation from the test conditions or test specimen construction, such as size, materials, method of assembly, also affects the fire-test-response. For these reasons, evaluation of the variation is required for application to construction in the field.

Note 4: When the size of the HVAC duct exceeds the capability of the test furnace to test it, the authority having jurisdiction (AHJ) should be consulted to determine what test and evaluation of the variation is required for application to construction in the field.

Subcomité:

E05.11

Referida por:

E0176-24, E2226-23A, E3385-24

Volúmen:

04.07

Número ICS:

13.220.50 (Fire-resistance of building materials and elements), 91.140.30 (Ventilation and air-conditioning systems)

Palabras clave:

engulfment test; fire resistive; fire-resistive material; fire-separating elements; hose stream; HVAC duct; HVAC duct system; internal fire test;