Famco Flue Liner Replacement Nationwide

Famco Flue Liner Replacement: The Chelmsford Owner’s Guide

We stock and install Famco-compatible flue liner replacement for most residential models, with typical installed pricing in Chelmsford running $1,800 to $3,400 depending on liner diameter, flue height, and whether the existing liner pulls out cleanly. Most Famco replacements we book are completed in a single visit because our technicians carry the common diameters on the truck. You’ll usually discover the problem during a sweep when the camera finds cracked terracotta, corrosion pinholes, or a liner that has shifted out of alignment after decades of freeze-thaw cycles in Middlesex County.

Call (978) 991-9492

Which Famco Models This Applies To

Famco flue liners were sold under several series names over the years, and the label matters for getting the right replacement diameter and alloy grade. The most common we see in Chelmsford are the Famco 304-alloy flexible liners in 6-inch, 7-inch, and 8-inch diameters, along with the heavier 316-alloy series used for oil and coal conversions in older homes near the center of town. Check the top termination cap for a stamped model prefix, usually “FL-” followed by the diameter and alloy code. If the label is corroded off, we measure the flue tile opening and the appliance collar to confirm fit.

OEM Famco liners are no longer manufactured, so replacement means matching to a quality aftermarket equivalent. We use 316Ti stainless from Olympia Chimney or Copperfield for the exact same corrosion resistance, often at lower cost than chasing old Famco stock. The critical gotcha: some 1980s Famco installations used a proprietary top plate spacing that doesn’t mate cleanly with modern termination caps. We carry adapter plates for this exact issue, which is why a camera inspection before ordering parts saves a return trip.

Signs Your Famco Flue Liner Replacement Is Failing

• White or orange staining on the exterior brick. This means exhaust gases are leaking through liner cracks or failed joints, condensing on the cooler outer surface. In Chelmsford’s wet winters, this accelerates mortar decay and can freeze into spalling damage by March.
• Acrid smoke smell when the furnace or fireplace is not running. A compromised liner creates backdraft paths. Cold air sinks down the flue and carries residual soot odor into your living space, especially in ranch-style homes with low chimney height.
• Visible rust flakes in the firebox or cleanout. The Famco liner’s inner wall has corroded through at a joint or low point where acidic condensation pools. Once you see rust, the liner wall is already thin enough to fail under thermal shock.
• Chunks of clay tile in the cleanout. This means the original terracotta flue is collapsing behind a failing Famco liner that was installed as a retrofit. The liner is no longer protecting the chimney structure, and falling debris can block the flue entirely.
• Carbon monoxide detector alerts near the chimney chase. A leaking liner is a direct path for CO into wall cavities or the attic. This is not a symptom to monitor; it’s a reason to stop using the appliance until inspection.

Replacement Cost & What’s Included

What drives the range: flue height, number of offsets, whether the existing liner is seized in place, and whether the top plate or crown needs repair after removal. Our estimate includes the liner, termination cap, bottom connector, insulation if required, labor, and disposal of the old liner. The price we quote is the price on the invoice. Every Famco liner replacement is covered by our 90-Day Done Right Promise in writing, and we photograph the full flue run before and after so you see what we saw.

DIY or Call Us?

There’s a safe middle ground here. You can verify your Famco model from the cap stamp, check the cleanout for debris, and confirm your appliance BTU rating from the nameplate. All of that helps us bring the right parts on the first trip.

What you should not do: climb the roof to pull a liner, attempt to break loose a seized liner with force, or install a replacement without verifying NFPA 211 clearance requirements to combustibles. A flue liner under tension can whip when released, and an improperly sized replacement creates a carbon monoxide hazard you cannot see until it’s too late. We’ve rescued more than one Chelmsford homeowner who bought the right diameter but the wrong alloy for their fuel type. If the flue isn’t right, the fire isn’t safe - it’s that simple. Call (978) 991-9492 and we’ll sort it out with photos you can see and a plain-English verdict.

FAQs