Furnace Flue Pipe and Venting Repair in Central Oklahoma
Every spring, I make flue calls that start the same way: the homeowner says the furnace worked fine all winter but now will not stay on. Nine times out of ten, I find a wasp nest or mud dauber nest packed into the vent cap. Wasps in central Oklahoma build fast. A vent termination that was clear in March can be completely blocked by May. I have been clearing flue blockages and repiping furnace venting across Kingfisher County for 45 years, and I can tell you: this is one category of HVAC repair where you do not wait and see.
A blocked or disconnected flue puts carbon monoxide inside your home. A cracked PVC joint in a mechanical closet does the same thing slowly over time. If your furnace is locking out, your CO detector is alarming, or you see yellow flames instead of blue at the burners, shut the system off and call me.
Furnace Flue Pipe and Venting Service Pricing
Clear 2in PVC Flue Blockage (Minor)
95
Soft blockages: wasp nests, light debris
Clear 2in PVC Flue Blockage (Major)
95
Compacted nests, bird material, ice blockages
Clear 3in PVC Flue Blockage (Minor)
25
Clear 3in PVC Flue Blockage (Major)
45
Clear Roof Vent Cap
45
Remove bird/wasp nest blocking roof termination
Replace Up to 2 Feet of Flue Pipe
45
Replace 2-10 Feet of Flue Pipe
95
Replace 2in PVC Flue Pipe (Full Repipe)
95
High-efficiency 90%+ furnace venting
Replace 3in PVC Flue Pipe (Venting Upgrade)
45
Replace Furnace B-Vent Pipe
95
Type B metal venting for 80% AFUE furnaces
Replace Furnace + Water Heater Flue
95
Combined flue serving both appliances
Roof Jack, Cap & Collar Installation
95
New roof penetration for flue termination
Type B Vent Section 4in x 12in
45
Type B Vent Section 4in x 6in
75
Vent Pipe Increaser Fitting 4in to 5in
49
Flue Pipe Reconnect + Safety Inspection
95
Reconnect a separated joint plus CO check
Flue Pipe Section Repair Multi-Part
95
Add Combustion Air to Mechanical Closet
95
Required when furnace lacks adequate combustion air
Combustion Air Opening Enhancement
95
Improve existing opening for better airflow
Two Types of Furnace Venting in Oklahoma Homes
PVC plastic pipe (high-efficiency, 90%+): White plastic pipe, 2 or 3 inches, that exits through a side wall. These systems use a condensing heat exchanger that produces water vapor in the exhaust. The low exhaust temperature means the pipe terminates near ground level, which is exactly where wasps, mud daubers, and ice can cause blockages.
Type B metal vent (standard-efficiency, 80%): Double-wall round metal pipe that rises through the ceiling and exits through the roof. Birds build nests at the roof cap in spring. Ice can form inside the cap during Oklahoma ice storms. Disconnected joints inside the attic are also a common problem on older homes.
CO alarm or furnace lockout? Shut it off. Open windows. Call 405-375-4822.
Frequently Asked Questions
What are the two types of furnace flue pipes and how do I know which one I have?
High-efficiency furnaces (90%+ AFUE) use white PVC plastic pipe, typically 2 or 3 inches, that exits through a side wall near ground level. Standard-efficiency furnaces (80% AFUE) use Type B round metal vent pipe that exits through the roof. If your flue is plastic PVC, you have a high-efficiency furnace. If it is shiny round metal going up through the ceiling, it is Type B metal venting.
What blocks a furnace flue and how do I know if mine is blocked?
The most common blockages in central Oklahoma are wasp nests and mud dauber nests in spring and fall, bird nests at roof caps, and ice blockages at wall terminals during ice storms. Signs of a blocked flue: the furnace lights, runs briefly, then shuts off on a safety lockout. Error codes on the furnace board. Yellow or orange flames visible at the burner. Carbon monoxide detector alarm.
Is a blocked or disconnected flue pipe dangerous?
Yes, this is a life-safety issue. Combustion gases including carbon monoxide exit through the flue pipe. If the flue is blocked, disconnected, or cracked, those gases can spill into your living space. Carbon monoxide is colorless and odorless. If you suspect a flue problem, do not run the furnace. Open windows and call for service immediately.
What does it cost to clear a furnace flue blockage?
Minor blockages in 2-inch PVC pipe start at 95. Major blockages are 95 for 2-inch and 45 for 3-inch. Roof vent cap clearing is 45. These prices include a safety inspection of the flue connection and a carbon monoxide check after clearing.
My furnace is in a closet. Does it need special venting?
Furnaces in enclosed closets need adequate combustion air. If the closet is too tight, the furnace pulls combustion air from the living space, which depressurizes the home and can cause backdrafting. Adding combustion air openings to the closet runs 95-95. This is a common code compliance issue in central Oklahoma homes built in the 1970s and 1980s.
Do you charge a dispatch and diagnostic fee for flue inspection?
Yes. There is a 9 dispatch fee for all service calls. If we perform a diagnostic to identify a furnace shutdown or CO concern, the 11 diagnostic fee applies and is credited toward your repair if you accept an estimate within 14 days.
Serving Central Oklahoma Including:
Ready to Schedule? Call or Book Online.
Call 405-375-4822 or book online. Same-day appointments available when the schedule allows.
9 dispatch fee applies to all service calls. 11 diagnostic credited toward repair or replacement if you accept an estimate within 14 days.