Famco Damper Repair Nationwide

Famco Damper Repair: The Silver Spring Owner’s Guide

Famco damper repair in Silver Spring typically runs $220-$380 installed, and we stock the common Famco throat and top-sealing damper assemblies on our trucks for same-day replacement. Most Silver Spring homeowners discover the problem on the first cold night in October or November, when they reach for the damper handle and find it stuck, wobbling, or hanging loose from corroded pins.

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We’ve been replacing Famco dampers in Montgomery County long enough to recognize the sound: that hollow rattle when the plate separates from its frame, or the grinding scrape of a rusted pivot pin in a chimney that hasn’t been swept in five years. In the older colonials near Woodside Park and the mid-century ramblers off Georgia Avenue, we see the same pattern. These chimneys were built with solid masonry but marginal draft control, and the original Famco throat dampers are now thirty to forty years into a lifespan that was never meant to stretch that far in Maryland’s freeze-thaw cycle.

Which Famco Models This Applies To

Famco has manufactured throat dampers under several series names over the decades, and the critical detail is whether your damper is a cast-iron frame with a removable plate or a stainless steel top-sealing unit mounted at the flue tile. The cast-iron throat assemblies, common in Silver Spring homes built 1965-1995, carry model numbers starting with FD or FDT; the top-sealing caps use the FDC or FDC-R series designation. Both are stamped on a small metal tag attached to the frame or the cap housing.

Here’s where owners get tripped up: the FD-series throat dampers were produced in three frame widths (13″, 16″, and 20″) to match standard flue tile dimensions, but Famco changed the pivot pin diameter in 1987 from 3/8″ to 7/16″. A 1986 FD-16 plate will not seat on a 1988 FD-16 frame, and we’ve seen homeowners order the wrong replacement twice before calling us. We measure the frame opening and pin diameter before quoting, and we carry both OEM Famco hardware and quality aftermarket equivalents from Gelco and Olympia Chimney that match the original specs without the OEM markup. Hearthstone Chimney Co. is an independent service provider, not affiliated with Famco.

Signs Your Famco Damper Repair Is Failing

• The handle turns but the plate doesn’t move. The linkage between the handle spindle and the damper plate has corroded through or the cotter pin has sheared. This is the most common failure we see in Silver Spring, especially in chimneys with marginal crown sealing where rainwater has been dripping onto the mechanism for years.
• The plate is stuck open or closed and won’t budge. Rust has welded the pivot pins to the frame ears, or creosote buildup has glued the plate to the frame seat. Forcing it with a poker or wrench usually snaps the cast-iron ear off the frame, turning a $280 repair into a $600+ rebuild.
• You feel a cold draft even when the damper is “closed.” The plate has warped from years of heat cycling, or the frame has cracked at the throat wall junction. A warped 16″ plate can leave a 3/8″ gap along one edge, enough to pull heated air up the flue all winter.
• There’s a metallic rattling or clanking when the wind blows. The plate has detached from one pivot pin and is hanging by a single corner, or the top-sealing cap’s spring tension has failed and the lid is chattering against the housing. Either way, the damper is not sealing and debris can fall into the firebox.
• Smoke spills into the room on light-off. The damper plate is not opening fully due to a bent linkage or the handle assembly has slipped its set-screw, leaving the throat half-blocked. This is the symptom that gets homeowners’ attention fastest, and it’s also the most dangerous if they’re already lighting paper and kindling.

Replacement Cost & What’s Included

The range depends on three things: whether we can access the damper from the firebox or need to work from the roof, whether the flue tile throat is intact or cracked around the frame seat, and whether you need a standard or oversized assembly. Our estimate includes the part, labor, a level-2 camera inspection of the repaired throat with photos you can see, and the 90-Day Done Right Promise in writing. The number on the estimate is the number on the invoice. We also offer $50 off any repair over $250, and a permanent 5% senior and veteran discount.

DIY or Call Us?

There’s a safe middle ground here. You can verify the model number from the firebox, check the handle for obvious looseness, and shine a flashlight up the flue to spot a detached plate or heavy rust scaling. What you should not do: reach up the flue with tools to free a stuck damper, attempt to remove a corroded pivot pin with a hammer, or install a replacement assembly without checking the flue tile throat for cracks. The cast-iron frames are brittle, the throat opening is narrow, and a slipped tool can crack the flue tile or dislodge mortar into the smoke chamber. We’ve rescued enough DIY attempts in Silver Spring to know where this goes wrong. If the plate won’t move freely with gentle hand pressure, call us at (301) 479-9806. We’ll diagnose it with a camera, quote it upfront, and most jobs finish in a single visit.

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