Famco Damper Repair: The San Francisco Owner’s Guide
We stock and install Famco-compatible damper repair kits for most residential chimney models in San Francisco, with typical installed pricing between $280 and $520 depending on access and whether the frame needs replacement. Most Famco damper jobs are completed same-day because we carry the common sizes on our trucks. Homeowners usually discover the problem on the first cold evening in the Richmond or Sunset when the damper won’t open fully, or they notice a persistent draft even with the firebox cold.
Which Famco Models This Applies To
Famco dampers fall into two main residential lines: the traditional cast-iron throat dampers found in pre-1980 San Francisco homes, and the stainless top-sealing dampers installed in most retrofits since the 1990s. The throat models typically carry a stamped model number on the forward edge of the frame, visible with a flashlight and a mirror. Top-sealing units have a data plate on the motor housing or cap assembly.
The critical compatibility gotcha in this city is frame width. Victorian and Edwardian flues in neighborhoods like Pacific Heights and Noe Valley were often built to 11.5-inch or 13-inch throat openings, but Famco’s modern replacement line ships in 12-inch and 14-inch standards. We measure on-site with a flue ruler before ordering; forcing a mis-sized frame cracks the mortar seat and creates a gap that draws air for years. For OEM versus aftermarket, we source direct Famco hardware for top-sealing units because the cable tension specs are proprietary, but for cast-iron throat dampers we use compatible aftermarket frames from Copperfield when the original casting is discontinued. The aftermarket frames carry the same ten-year warranty and cost 20 to 30 percent less.
Signs Your Famco Damper Repair Is Failing
- The handle moves but the plate doesn’t follow. This usually means the linkage pin has corroded where it passes through the cast-iron frame, a common failure in San Francisco’s salt-air environment, especially in homes west of 19th Avenue where the fog lingers.
- You feel cold air falling down the flue when the fireplace is not in use. The damper plate is warped or the frame seat has eroded, creating a gap that bypasses the seal. In older Famco throat dampers, the plate edges thin from repeated heating cycles.
- The damper is stuck fully open or fully closed. Rust on the spiral hinge or debris in the track can seize the mechanism. We’ve found this often in homes near eucalyptus groves in the Presidio, where leaf tannins accelerate surface corrosion.
- You hear rattling or flapping during high wind. The damper plate has cracked or the retaining clip has failed, allowing the plate to lift in the draft. Top-sealing Famco units with degraded spring tension do this on south-facing slopes like Bernal Heights.
- Smoke spills into the room on light-off. The damper is opening only partially, or the plate has shifted off-center in its frame. This is the symptom that brings most San Francisco homeowners to call us.
Replacement Cost & What’s Included
| Service | Typical Range |
|---|---|
| Famco throat damper plate replacement (plate only, frame sound) | $280 - $380 |
| Full throat damper frame and plate replacement | $420 - $520 |
| Famco top-sealing damper motor/cable replacement | $340 - $480 |
| Top-sealing damper full cap and mechanism replacement | $480 - $650 |
What drives the range is access. A throat damper in a standard masonry fireplace with a cleanout door below takes ninety minutes. The same job in a tight Rumford-style firebox with slanted walls, common in 1920s Marina District homes, can run two and a half hours because we dismantle the smoke shelf to reach the frame lugs. Every Famco damper repair includes new fasteners, high-temp gasket where the frame meets the flue, and a Level-2 camera inspection of the repaired seal. Our 90-Day Done Right Promise covers the labor and hardware: if it doesn’t seal, we come back. In writing, no arguing.
DIY or Call Us?
There is one safe check a homeowner can make: with the firebox completely cold, open the damper fully and sight upward for daylight or obstructions. If you see a cracked plate or the handle spins freely, you’ve found the problem, but the fix belongs to a trained technician.
Throat dampers sit in a high-tension frame that is mortared into the flue throat. Removing it without supporting the flue tiles risks dropping debris into the smoke chamber or worse. Top-sealing Famco units run a stainless cable down the flue under spring load; if that cable releases unexpectedly, the cap can slam shut or the spring can unwind with force. We’ve been called to jobs in the Sunset where a homeowner’s attempt saved fifty dollars on labor and cost four hundred in damaged flue tiles. We carry Famco-compatible hardware on our trucks, and most repairs are done in a single visit. Call (855) 408-5567 and we’ll give you a straight answer on whether yours is a same-day fix.
FAQs
A cast-iron Famco throat damper typically lasts 20 to 30 years in San Francisco’s climate, though homes within three blocks of the Pacific coast often see closer to 15 years due to salt-air corrosion. Stainless top-sealing units average 15 to 20 years before the spring or motor fails. Call (855) 408-5567 if you’re unsure of your unit’s age; we can date it from the model stamp during inspection.
Sometimes. A detached handle or loose linkage pin can be re-secured if the frame and plate are sound. But if the plate is warped, cracked, or thinned at the edges, replacement is the only repair that seals properly. We don’t charge to assess it; our technician will show you the camera image and give a plain verdict.
Most Famco damper replacements take 90 minutes to two hours from ladder set to final seal check. Jobs requiring smoke shelf dismantling or flue tile repair add time, but we still complete most in a single visit. You’ll know the timeframe before we start; no-hassle upfront pricing means the number on the estimate is the number on the invoice.
We carry the common throat damper sizes and top-sealing cable assemblies for Famco, plus compatible frames from Copperfield and Gelco. If your model is a rare discontinued size, we order overnight and return the next business day. In 42 years, we’ve yet to leave a San Francisco homeowner without heat because of a parts delay.
If the flue isn’t right, the fire isn’t right. Everything else follows from that. We’ve learned that on rooftops from the Outer Sunset to Telegraph Hill, and we apply it to every Famco damper we touch. Warren Eckhart grew up two blocks from where the fog rolls in off the Great Highway, and he’s spent the better part of thirty years on the chimneys of this city’s Victorian and Edwardian homes. When you call Hearthstone Chimney Co. of San Francisco, you reach a live person, 24 hours a day, and we send a background-checked, uniformed technician who completes most jobs in a single visit. The estimate is free, the pricing is upfront, and our 90-Day Done Right Promise is in writing.
Written by Warren Eckhart, Owner & Master Sweep, Hearthstone Chimney Co. of San Francisco at Hearthstone Chimney Co. of San Francisco, serving San Francisco and nearby areas.