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INSTALLATION
HIGH ALTITUDE
This unit is approved in Canada for altitude from 0 to 2,000 ft. (0 to 600m) (Can 2.17-M90) with the main
burner orifice supplied. For installations above 2,000 feet, follow current CAN/CGA-B149.1 and B149.2.
In the USA refer to ANSI Z223.1 — latest edition, Appendix F, for resizing the orifice.
At altitudes greater than 2,000 feet it is necessary to match the air and fuel requirements by installing a
main burner orifice sized for the elevation that the appliance is installed at by referencing the chart shown
below. Be sure to check both front and rear orifice for proper drill size.
DRILL SIZING CHART
RECOMMENDED SIZE vs. ALTITUDE
ALTITUDE NATURAL GAS PROPANE (LPG)
Front Rear Front Rear
2,000 ft / 600m # 50 # 59 #1.25mm # 68
3,000 ft / 900m # 51 # 61 # 56 # 69
4,000 ft / 1200m # 51 # 61 # 57 # 69
5,000 ft / 1500m # 51 # 62 # 57 # 69
6,000 ft / 1800m # 52 # 62 # 57 # 70
7,000 ft / 2100m # 52 # 63 # 58 # 70
8,000 ft / 2400m # 52 # 64 # 59 # 70
9,000 ft / 2700m # 53 # 64 # 59 # 71
10,000 ft / 3000m # 53 # 65 # 60 # 71
The above orifice sizing chart should be used as a guide only. Actual orifice size may be
different due to venting configuration and actual altitude.
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