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SBN71-120 thru 85-390, SBD30-150/199 TANK TYPE COMMERCIAL
GAS WATER HEATER SERVICE HANDBOOK
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5.Use a 45° elbow in place of a 90° elbow where possible. Avoid the use of a 90° elbow
immediately above the draft hood. Allow the maximum vertical rise before any elbow.
6.Horizontal pipe should be sloped
upward at a minimum of ¼” per foot.
9 RULES FOR GOOD VENTING
HORIZONTAL RUN
VERTICAL RISE
EQUAL TO
1/4” PER FOOT OF
HOROZONTAL
RUN