2
A 100mm (4in) 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 combustible materials must be installed as
recommended in ANSI/NFPA 211 and according to
manufacturers instructions. Chimneys and vents shall
terminate above roof level and in accordance with the
requirements of the current issue of ANSI/NFPA 211 (see
diagrams) 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 - latest edition 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 combustible walls and
partitions must be guarded by a ventilated metal thimble not
less than 200mm (8in) diameter.
Chimneys and vents shall terminate above roof level and in
accordance with the requirement of the current issue of the
CAN/CGA - B149 Installation Code (Code W) (see
diagrams) and be at least 1.53m (5ft) above the flue collar
of the draft outlet.
1.
If suitable lined brick chimney is used it must be
swept before connection and not less than 150mm
(6in) internal diameter.
2.
The top of the chimney should be fitted with an
approved Terminal.
3.
The flue route to the chimney should be as direct as
possible. Resistance in the form of directional change
should be kept to a minimum. Right angle bends and
horizontal runs should be avoided.
4.
The chimney terminal should terminate at the highest
possible point, preferably in a freely exposed position.
Termination at the roofs eaves is unacceptable.
5.
The Aga Distributor or Local Gas Company should be
advised where any doubt arises as to the suitability of
the flue.
6.
Approved factory made chimneys are acceptable with
VENT CONNECTION
