Gelco Damper Repair Nationwide

Gelco Damper Repair: The Sherman Oaks Owner’s Guide

Gelco damper repair in Sherman Oaks typically runs $280-$520 installed, depending on whether we’re replacing the plate, the frame, or the full assembly. We stock Gelco-compatible parts on our trucks and can usually complete the swap in a single visit. Most Sherman Oaks homeowners discover the problem the first cold morning in November, when they reach for the chain and the plate won’t budge, or it drops but leaves a gap that lets the living room fill with smoke.

Call (424) 414-6048

Which Gelco Models This Applies To

Gelco has produced several damper lines over the years, and the part you need depends on the throat width, the depth of the firebox lintel, and whether your original was a top-mount or throat-mount design. The most common units we see in Sherman Oaks are the Gelco 18-inch and 24-inch cast-iron throat dampers, often paired with their stainless steel chimney caps on homes built between 1965 and 1995.

To identify yours, look for the raised casting mark on the plate itself, usually near the hinge pin. If the mark is worn off, measure the throat opening width and the depth from the lintel to the smoke chamber. Here’s where owners get tripped up: Gelco’s 24-inch plate requires a 26-inch rough opening, and many homeowners measure the plate alone, order a 24-inch replacement, then find it won’t seat. We carry both OEM Gelco castings and aftermarket equivalents from our Haven buying network, sourced through Olympia Chimney and Famco. The aftermarket units match Gelco’s specs at a lower price point; the OEM carries the original casting number for purists and historic compliance. We’ll show you both on the truck and quote each in writing before you choose.

Signs Your Gelco Damper Repair Is Failing

• The plate sticks or seizes completely. Creosote glazing builds up along the Gelco’s cast-iron edges, especially in Sherman Oaks homes that burn oak or eucalyptus. The plate warps slightly from heat cycling, then the glaze locks it in place. Forcing it with a poker cracks the casting.
• You feel a cold downdraft even when the damper is “closed.” The Gelco’s cast-iron plate can warp or corrode at the edges, leaving a 1/4-inch gap that might as well be an open window. In the Ventura Boulevard corridor, where the Santa Ana winds hit rooflines directly, this gap turns your chimney into a heat pump in reverse.
• The chain or handle pulls free with no resistance. The Gelco linkage uses a simple pivot arm that corrodes where it passes through the firebox wall. Once the pin shears, the plate hangs free and won’t respond to the control.
• Rust flakes fall onto the firebrick when you operate the damper. Cast iron holds moisture from humid winter rains; Sherman Oaks sees enough December-January precipitation that unseasoned dampers develop surface rust, then scale, then pitting that weakens the plate.
• Smoke spills into the room on startup. A partially open Gelco damper restricts draft until the flue warms. If the plate is hanging crooked on a worn hinge, it creates turbulence that pushes smoke backward until temperatures equalize.

Before

After

Replacement Cost & What’s Included

The range reflects access difficulty: a standard masonry firebox with a clean throat is straightforward; a sunken hearth with decorative brick facing takes longer to protect and restore. Every quote includes the camera inspection, a written scope, and our 365-Day Done Right Promise under the Haven Standard. We source materials through our buying network specifically to keep customer prices honest, and we deliver the written price before anyone picks up a tool, per Haven Standard Clause 1.

DIY or Call Us?

There’s exactly one safe thing a homeowner can check: whether the problem is the linkage or the plate itself. Remove the firescreen, shine a flashlight up at the damper, and have a second person work the handle. If the pivot arm moves but the plate doesn’t, the linkage is likely the issue. If the plate moves freely but won’t seal, it’s warped or corroded.

Everything past that observation belongs to a trained technician. The Gelco plate is cast iron and heavy; it sits in a high-tension hinge that can snap closed on fingers. More critically, any work inside the throat risks dislodging creosote into the firebox, and without a camera inspection you can’t see whether the smoke chamber above has deterioration that contributed to the failure. Corrine Halstead and our crew carry the full assembly on the truck, but we won’t install it without the camera scan - the camera doesn’t lie, and neither does the written quote. Call (424) 414-6048 and we’ll book a time that works.

FAQs