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Furnace Venting & Vent Pipe

Venting carries combustion products safely outside. High-efficiency condensing furnaces vent through PVC, CPVC, or ABS because their flue gas is cool and wet; mid-efficiency appliances use metal vent pipe. The two are not interchangeable, and vent problems show up as pressure switch faults far more often than as anything obviously vent-shaped.

8 venting & vent pipe in stock, ready for same-day pickup at our Coquitlam warehouse or shipped worldwide. Homeowners and contractors buy at the same counter — no trade account needed.

Signs your venting may have failed

  • Pressure switch faults that come and go with the weather
  • Ice or snow blocking the vent termination outside
  • Visible corrosion, sagging, or separated joints in the vent run
  • Condensate leaking from a vent joint

Not sure which part you need? Call 1-778-759-9864 with your furnace model number and we will confirm it before you order.

Troubleshooting guides

Why Won't My Furnace Ignite?A Practical Guide to Common Causes and ChecksYour Furnace Sequence of OperationUnderstanding How Your Gas Furnace Starts and RunsPressure Switch Stuck OpenWhy Your Furnace Will Not Start the Heating Sequence

Shop venting & vent pipe by brand

Lennox8

Venting & Vent Pipe we stock

3/4" PVC PIPE 10' LENGTH PVC Schedule 40, 636 PVC, S636, ABS furnace part

3/4" PVC PIPE 10' LENGTH

Part #: 636-007
In Stock
CA$38.39
LENNOX FURNACE FLUE EXHAUST, 2" PVC Schedule 40, 636 PVC, S636, ABS furnace part

LENNOX FURNACE FLUE EXHAUST, 2"

Part #: 636-013
In Stock
CA$76.28
IPEX 2" PVC FGV COUPLING WHITE S636 PVC Schedule 40, 636 PVC, S636, ABS furnace part

IPEX 2" PVC FGV COUPLING WHITE S636

Part #: 636-324
In Stock
CA$5.61
IPEX 2" 45 DEGREES PVC FGV ELBOW WHITE S636 PVC Schedule 40, 636 PVC, S636, ABS furnace part

IPEX 2" 45 DEGREES PVC FGV ELBOW WHITE S636

Part #: 636-330
In Stock
CA$11.32
IPEX 2" 90 DEGREES PVC FGV LONG ELBOW HXH WHITE S636 PVC Schedule 40, 636 PVC, S636, ABS furnace part

IPEX 2" 90 DEGREES PVC FGV LONG ELBOW HXH WHITE S636

Part #: 636-334
In Stock
CA$11.63
IPEX 2" 636 WHITE PIPE PER FOOT PVC Schedule 40, 636 PVC, S636, ABS furnace part

IPEX 2" 636 WHITE PIPE PER FOOT

Part #: 636-343
In Stock
CA$7.46
LENNOX VENT DAMPER MOTOR SPRING Metal Venting furnace part

LENNOX VENT DAMPER MOTOR SPRING

Part #: 638-065
In Stock
CA$74.64
SPDT VENT DAMPER DOOR SWITCH FOR G20 125/250VAC Metal Venting furnace part

SPDT VENT DAMPER DOOR SWITCH FOR G20 125/250VAC

Part #: 638-066
In Stock
CA$51.81

Venting questions

Can I use metal vent pipe on a high-efficiency furnace?
No. Condensing furnaces produce cool, acidic condensate that corrodes metal vent pipe. They vent through PVC, CPVC, or ABS as specified by the manufacturer. Using the wrong material is both a code violation and a genuine carbon monoxide risk.
Why does my furnace fail during snow or high wind?
Almost always a blocked or wind-affected vent termination. Snow drifts, ice build-up from the condensate plume, and even a bird nest will restrict the vent enough to open the pressure switch. Keep the termination clear — it is the most common winter no-heat call we take.

Need it today in Greater Vancouver?

Call ahead and we will set the part aside at the Coquitlam counter.

1-778-759-9864Pickup details