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IRC 2009

According to the 2012 IRC, factory-made plastic above-ground ducts shall _____?


Choose one of the answers below.

(A.)   be constructed of Class 0 materials with a maximum flame spread index of 15.
(B.)   be constructed of Class 1 materials with a maximum flame spread index of 25.
(C.)   be used only in duct systems constructed of materials having a flame spread index not greater than 100.
(D.)   not be used in residential applications.
(E.)   It depends on what City you are working in.
(F.)   Up to the Fire Official


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The question was reprinted from England Enterprises, Inc.


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