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A 125 mm (5") Type B Gas Vent must be used and fastened by screw to the draft hood flue collar.
U.S.
The gas vent must be connected to a chimney or independently and in accordance with Chapter 26, chimney Gas Vent
and Fireplace Systems of the current issue of Equipment and Volume of the ASHRAE Handbook. The gas vent proximity
to combustion materials must be installed as recommended in ANSI/NFPA 211 and according to manufacturers
instructions. Chimneys and vents shall terminate above the roof level and in accordance with the requirements of the
current issue of ANSI/NFPA 211 (see Fig. 2) and be at least 1.53m (5ft) above the flue collar of the draft hood outlet.
Part 7, Venting of Equipment, outlined in the current National Gas Code ANSI Z223, gives detailed guidelines on all these
aspects.
Canada:
The gas vent must be connected to a chimney or independently and in accordance with the CAN/CGA - B149 Installation
Codes.
The air gap between vent and combustible materials must be given for the following types of vent:
(i)
Type B Vent - 25mm (1in) minimum
(ii)
Single wall vent connector - 150mm (6in) minimum
Listed connectors passing through the combustible walls and partitions must be guarded by a ventilated metal thimble not
less than 200mm (8in) diameter.
VENT CONNECTION
9
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