Famco Damper Repair Nationwide

Famco Damper Repair: The San Mateo Owner’s Guide

Famco damper repair in San Mateo typically runs $280-$520 installed, depending on whether your flue needs a throat damper rebuild or a full top-mount replacement. We stock Famco-compatible hardware on every truck and can usually match your model same-day. Most owners discover the problem on the first cold night in November, when smoke backs into the living room or the damper won’t budge from its summer-open position.

Call (650) 600-3117

Which Famco Models This Applies To

Famco built dampers under several series names over the years, and the part you need depends on when your fireplace was installed and what type of flue you’re working with. The most common in San Mateo are the Famco throat dampers found in pre-1990s masonry fireplaces, typically 30-inch to 42-inch throat openings with a cast-iron frame and steel plate. Newer installs may carry a Famco top-sealing damper, which mounts at the flue cap and uses a cable down the flue wall.

To identify yours, look for a stamped model number on the damper frame, visible when the plate is fully open. If the stamp’s rusted over, measure the throat width and depth at the smoke chamber entrance. Famco throat dampers are not interchangeable with Lock-Top or Lyemance mounts without adapter plates, and the cable routing on Famco top-mount units uses a narrower gauge than competitors. We carry both OEM Famco hardware and aftermarket equivalents from Copperfield that meet the same ASTM A48 cast-iron spec. The aftermarket route saves roughly $60-$90 on parts without sacrificing the 10-year frame warranty we include on every install.

Signs Your Famco Damper Repair Is Failing

• Smoke rolls back into the room on startup. The damper plate isn’t seating fully open or the frame has warped from heat cycling, creating a partial obstruction that traps combustion gases. In San Mateo’s older Baywood homes with original Famco throats, we’ve found plates that sag 3/8 inch or more off true.
• The handle or chain moves freely but the plate doesn’t follow. The linkage pin has corroded through or the pivot bracket has cracked. Famco used a smaller-diameter pivot pin than most competitors in units built before 1985, and these shear first.
• You feel cold downdraft even when the damper is “closed.” The plate gasket has degraded or the frame itself has developed a gap from thermal expansion. Pacific moisture accelerates this; we see it most in hillside homes above Crystal Springs where fog sits heavy.
• Rust flakes fall when you operate the handle. The cast-iron frame is spalling from the inside out. Once rust reaches this stage, the frame thickness is compromised and patching is temporary at best.
• The damper is stuck completely open or closed. Either the plate has jumped its track or creosote buildup has cemented it in place. Class III glazed creosote is the usual culprit in San Mateo, where homeowners often burn pine and eucalyptus for aroma without realizing the resin load.

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Replacement Cost & What’s Included

What drives the range: accessibility of the smoke chamber, whether the firebrick needs partial removal to extract the frame, and if the flue liner shows damage we document before quoting additional work. We deliver a written price before any work starts, Clause 1 of the Haven Standard. Every Famco damper repair includes a documented photo record under Clause 4, and the 365-Day Done Right Promise covers the installation.

DIY or Call Us?

There’s one thing you can safely check yourself: whether the damper plate is actually moving when you operate the handle. Shine a flashlight up the flue from the firebox and watch while a second person works the control. If the plate moves but doesn’t seal, or if the handle spins without resistance, you’ve found the symptom.

What you shouldn’t attempt: removing a stuck or rusted damper frame. These assemblies weigh 15-25 pounds and sit above the smoke chamber, where a dropped frame can crack the firebrick or damage the flue liner. The pivot pins are under spring tension on some Famco models, and a slipped wrench can send hardware into the flue where it lodges against the liner wall. We carry extraction tools specific to Famco frame dimensions, and our camera inspection confirms liner integrity before we quote the repair. The camera doesn’t guess. Neither do we. Call (650) 600-3117 and we’ll show you what we found before naming a price.

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