Flue and Combustion Air Venting
3-4
750-382
CBT
Examine the venting system at least once a year. Check all joints and vent pipe connections for tightness,
corrosion or deterioration.
3.3.1 — Venting installation tips
Where to support piping:
• Horizontal runs- at least every five (5) feet.
• Vertical runs - use braces under or near elbows
Observe the following to avoid personal injury or property damage:
• To cut nonmetallic vent pipe, use a fine-toothed hacksaw (34 teeth per inch).
• Do not use nonmetallic vent pipe or fittings that are cracked or damaged.
• Do not use nonmetallic vent fittings if they are cut or altered.
• Do not drill holes, or use screws or rivets, in nonmetallic vent pipe or fittings.
Refer also to the vent manufacturer’s installation instructions.
During winter months check the flue termination and make sure no blockage occurs from build up of ice or
snow. Condensate can freeze on a flue termination. Frozen condensation at the flue termination can result in a
blocked flue condition.
FIGURE 3-1. Vent Terminations
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