Clause 8.18.3

(8.18.3) Unless certified, a vent connector that serves an appliance with a draft hood shall not be made of material less than
(a) No. 28 GSG for all sizes up to and including 5 in diameter;
(b) No. 26 GSG for sizes over 5 in up to and including 8 in diameter
Unless certified, an aluminum vent connector shall be not less then No. 22 B&SG (0.64mm), except that a Type B vent may be used for the connector between the draft hood and the chimney.


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