About This Service
When a throat damper is rusted through or its frame has failed, replacement — usually with a modern top-sealing damper — is an upgrade, not just a fix. Top-sealing units mount at the flue's exit and close with a silicone gasket, sealing far tighter than any throat damper ever could.
A top-sealing damper doubles as a weather cap when closed, keeps animals and precipitation out year-round, and opens fully with a simple cable control at the firebox. For most Colorado homes it pays for itself in reduced heat loss within a few seasons.
Signs You Need Damper Replacement
- Throat damper rusted through or missing entirely
- Persistent cold drafts from the fireplace in winter
- You also need cap-level protection from weather and wildlife
- The old damper frame is cracked into the surrounding masonry

What a Damper Visit Includes
Mechanism, plate, and frame assessed; seized parts freed and cleaned.
Repairable dampers are adjusted, lubricated, and re-sealed.
Replacement recommendations come with a demonstration of why.
Every damper leaves either working properly or honestly diagnosed.
Why It Matters for Safety
A damper that won't close wastes heat; one that won't open fills rooms with smoke — and either failure invites improvised workarounds that create real hazards. A properly working damper is basic operational safety for any wood-burning system.
Maintenance Tips From Our Technicians
- Cycle the damper fully once a month, all year.
- A stiffening damper wants cleaning now, not force later.
- Top-sealing damper gaskets: inspect at each annual service.
- Never operate a fireplace with a damper that can't be verified open.
Why Homeowners Choose Donovan Chimney & Fireplace
What makes Donovan Chimney & Fireplace different is boring and rare: we show up when scheduled, we explain findings in plain language with photos, and our pricing is set before the work starts. Twenty-five-plus years on the Front Range, fully licensed and insured, open around the clock.
Related Services
Frequently Asked Questions
How does a top-sealing damper work?
It's a gasketed lid at the top of the flue, held open against a spring by a stainless cable that runs down to a handle in your firebox. Release the handle and it seals; pull and lock and it's fully open. Simple, and very effective.
Do I still need a chimney cap with a top-sealing damper?
The damper covers the flue when closed; when you burn, it's open like any flue. Most units integrate a rain hood, and we'll configure protection appropriate to your setup — including screening for fire-prone areas.
What areas do you serve?
We work throughout the Colorado Front Range — roughly 65 miles around each of our three bases in Denver, Fort Collins, and Colorado Springs, from the Wyoming line down to Pueblo and up into the mountain communities.
Request a Free Estimate
We're open 24/7. Fill this out and we'll get right back to you — or call 720-310-3798.
Book Damper Replacement Today
We serve Denver, Fort Collins, Colorado Springs, and every community around them — see the full service area list.
Emergencies don't keep business hours and neither do we: our phone answers 24 hours a day, 7 days a week.
