A damper closes the chimney when the fireplace isn't in use. Throat dampers sit just above the firebox and often warp or rust, leaking air. Top-sealing dampers close at the top of the chimney with a gasket, seal much tighter and also keep rain and animals out.
Throat dampers
The original metal plate in most masonry fireplaces. Over time heat and moisture warp and rust them, so they stick or don't close fully.
Top-sealing dampers
Mounted on top of the flue and operated with a cable from the firebox. A rubber gasket seals tightly, cutting drafts and heat loss, and the closed lid keeps out water, debris and animals.
Signs your damper needs attention
- Cold drafts or odors from the fireplace
- Handle that sticks, won't latch or spins freely
- Rust flakes falling into the firebox
More questions
Should I close the damper when the fireplace isn't in use?
Yes — but never while there are still embers in the fireplace.
Need a local professional?
Chimney Champs has been a local chimney company for 13 years. We provide chimney caps & dampers in your area. Call (856) 300-9215 for a free estimate.
Sources & further reading
- NFPA 211 — Standard for Chimneys, Fireplaces, Vents, and Solid Fuel-Burning Appliances (National Fire Protection Association)
- Chimney Safety Institute of America (CSIA)
Keep reading
- How Often Should You Clean Your Chimney?
- How to Get Your Fireplace Ready for Winter: A 10-Step Checklist
- Why Does My Chimney Smell? 5 Causes and Fixes
- Why Is My Fireplace Smoking Into the House?
- The Best Firewood to Burn (and What Never to Burn)
- Gas Fireplace Maintenance: What Needs Checking Every Year
- Wood Stove and Insert Maintenance: A Season-by-Season Guide