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file:///D:/System/DATA/Dx/ds1/Us/iss1/EINS512426/EINS512426.htm
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 Equipment, outlined in the current National Gas Code NASI Z223, outlined in the current 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.
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 as to the suitability of the flue.
6. Approved factory made chimneys are acceptable with the appliance and should not be less than (4in) internal diameter.
7. In the event of an extractor fan being fitted in the vicinity of the range, compensatory ventilation will be required to satisfy the
demands of the fan without influencing combustion efficiency or chimney flue condition.
file:///D:/System/DATA/Dx/ds1/Us/iss1/EINS512426/EINS512426.htm (4 of 11)8/17/2006 10:51:16 AM