Best Propane Tankless Water Heater for Radiant Heat 2026 - Ultimate Comfort & Efficiency

1

PLESIU Vestal 36 Fireplace Damper, 36", Cast Iron

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  10.0
• Brand
  Vestal

Key specs2

Frame Dimensions

40 in W x 13.5 in L x 6 in H

Throat Damper Operation

Mounts directly in the throat of the firebox, requiring manual opening and closing at the base of the chimney.

Pros & cons32

Pros

• Cast iron construction provides heavy-duty resilience against intense fireplace heat
• Sized at 40 inches wide by 13.5 inches deep to cover standard 36-inch fireplace throat openings
• Traditional low-profile frame allows direct installation inside masonry fireplace throats

Cons

• Requires reaching directly into the fireplace throat to operate the internal valve plate
• Metal-on-metal seating lacks an airtight gasket seal against lingering chimney drafts

2

Anrain Chimney Damper Kit 13"x13", for Wood-Fueled Masonry fireplaces, Cast

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  10.0
• Brand
  Anrain

Key specs2

Operating Temperature Range

-40°F to +120°F

Cable Control Setup

A 30-foot adjustable cable connects the top-mounted damper to a cold-touch spring handle mounted inside the firebox.

Pros & cons42

Pros

• Double-seal lid design utilizes liquid sealant to create an airtight barrier at the chimney top
• Mounts to the chimney crown to block downdrafts, rain, snow, and moisture from entering the flue
• Includes 30 feet of cut-to-fit cable and a cold-touch spring handle for easy hearth operation
• Cast aluminum and stainless steel build withstands temperatures from -40°F to 120°F

Cons

• Strictly designed for wood-burning masonry chimneys and cannot be used with vented gas logs
• Requires roof access and silicone adhesive application to secure the frame to the chimney top

3

Chimney Damper Kit 13"x13", Air Tight Chimney Damper for Wood-Fueled

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  10.0
• Brand
  AQOVOR

Key specs2

Top-Mount Gasket System

Utilizes a double gasket perimeter to seal the top of 13 by 13 inch masonry flues directly against outdoor elements.

Cable Reach

30-foot cut-to-fit cable

Pros & cons32

Pros

• Cast aluminum construction resists corrosion, oxidation, and outdoor weather exposure
• Double gasket configuration seals out drafts and prevents heat loss through the flue
• Equipped with a 30-foot adjustable cable and spring handle for simple damper control

Cons

• Incompatible with chimney flues that serve vented gas log fireplaces
• Installation demands rooftop access to secure the damper atop the clay flue tile

4

Magnetic Fireplace Blanket for Heat Loss, Black Indoor Fireplace Covers

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  9.2
• Brand
  whumsdog

Key specs2

Attachment Method

12 built-in magnets (1.2 T suction force)

Draft Barrier Material

Flame-retardant oxford fabric filled with insulating sponge covers the fireplace face to stop room heat loss.

Pros & cons33

Pros

• Twelve built-in magnets secure the blanket firmly against magnetic fireplace frames
• Flame-retardant oxford cloth with sponge insulation stops room heat loss and soot odors
• Folds down compactly for seasonal storage when the fireplace is in active use

Cons

• Adheres only to magnetic metal frames containing iron, cobalt, or nickel
• Must not be attached until the fire is completely extinguished and the firebox is cool
• Requires 24 hours of hanging after unboxing to regain normal thickness from vacuum packing

5

Midwest Hearth Fireplace Damper Clamp | Flue Stop Clamp for

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  9.2
• Brand
  Midwest Hearth

Key specs2

Gas Log Safety Function

Clamps onto the damper plate edge to keep the flue cracked open, preventing carbon monoxide buildup when burning gas logs.

Construction Material

All-steel construction

Pros & cons32

Pros

• Locks the chimney damper plate in an open position to satisfy local safety codes
• All-steel construction provides durable clamping force without bending or slipping
• Simple screw-tight mechanism attaches to the damper plate with basic household tools

Cons

• Prevents the damper from closing completely, allowing continuous airflow through the flue
• Intended strictly as a gas log safety lock rather than a draft-stopping damper device

6

Minuteman International Cast Iron Ash Dump, Black

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  9.0
• Brand
  Minuteman International

Key specs2

Firebox Hearth Application

Installs directly into the floor of the firebox to empty cold ashes into the chimney sub-floor pit.

Hearth Plate Dimensions

9.5 in x 5.4 in x 1 in

Pros & cons32

Pros

• Durable cast iron build handles hot debris, ash shovel contact, and high temperatures
• Louvered door opens smoothly to sweep cold ashes directly into the chimney ash pit
• Designed to mount flush in hearth floors for both new construction and masonry repairs

Cons

• Serves as a hearth floor ash dump cover rather than an upper chimney flue damper
• Louvered door does not create a sealed, airtight barrier against chimney base drafts

7

US Fireplace Products - Seal Tight Damper 13" x 13",

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  8.6
• Brand
  US Fireplace Products

Key specs2

Dual-Gasket Engineering

Combines an internal frame channel gasket with a secondary liquid gasket beneath the lid to stop warm air escape.

Flue Sizing Requirement

13 in x 13 in masonry flues

Pros & cons32

Pros

• Two-gasket system pairs an internal frame seal with a lid gasket for an airtight barrier
• Stops costly heated room air from escaping up masonry flues when fires are out
• Ships fully assembled to streamline rooftop mounting on 13x13 inch clay flue tiles

Cons

• Not suitable for chimneys serving vented gas log appliances
• Requires rooftop ladder access and flue measurement verification prior to installation

8

XYGOVIA Chimney Flue Stopper - 13"x 35" Rectangular Plug Blocker

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  7.2
• Brand
  XYGOVIA

Key specs2

Plug Material

1.0 in thick 100% pure wool

Custom Flue Trimming

Features three sewing thread lines enabling clean trimming down from the 13 by 35 inch stock size for an exact friction fit.

Pros & cons33

Pros

• One-inch thick pure wool construction provides dense thermal and acoustic insulation
• Sewn guide loops allow clean trimming down from 13x35 inches to fit smaller flue openings
• Presses directly into the lower flue without rooftop mounting or permanent hardware

Cons

• Must be manually removed before lighting a fire and reinserted after the hearth cools
• Cannot be used in fireplaces equipped with movable gas log devices
• Handling an unlatched plug inside the lower throat can loosen soot deposits

9

Chimney 26230 30 in. Vestal Cast-iron Fireplace Throat Damper

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  6.4
• Brand
  Chimney

Key specs2

Structural Weight

39 lb cast iron frame

Throat Replacement Fit

Measures 34 inches wide by 13.5 inches deep to replace standard 30-inch cast iron masonry throat dampers.

Pros & cons32

Pros

• Heavy 39-pound cast iron frame offers robust resistance to warping and flame heat
• Tailored to replace original 30-inch dampers inside masonry throat assemblies
• Solid throat-mounted casting preserves traditional wood-burning fireplace architecture

Cons

• Heavy 39-pound weight makes positioning and mortar alignment challenging during repairs
• Metal-to-metal plate design does not form a modern rubberized airtight draft seal

10

Chimney Damper Kit 13"x13", Fireplace Damper for Wood-Fueled Masonry Fireplaces,

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  5.8
• Brand
  AQOVOR

Key specs2

Hearth Control Mechanism

Connects a firebox spring handle to the rooftop damper via a 30-foot cable, letting you seal the flue without touching soot.

Kit Net Weight

3.5 lb

Pros & cons32

Pros

• Double-seal cast aluminum lid prevents warm air drafts from escaping through the flue
• Equipped with a 30-foot adjustable cable to open and shut the damper from the hearth
• Protective lid profile keeps rain, snow, and freezing moisture out of chimney masonry

Cons

• Restricted to wood-burning brick chimneys and unsafe for vented gas log systems
• Requires ladder access to mount the 13x13 inch damper assembly to the chimney crown

Last update on 2026-09-18 / Affiliate links / Images, Product Titles, and Product Highlights from Amazon Product Advertising API

How do you know if a fireplace damper is open or closed?

Look directly up into the firebox using a flashlight to check the position of the metal plate. When the damper is open, the plate pivots upward to reveal the hollow chimney flue, whereas a closed damper rests horizontally across the frame to seal off the opening. If you recently reviewed how to open a fireplace damper, closing the unit simply reverses that plate movement. You can also confirm the setting by checking the handle position or feeling for a sudden rush of cold air dropping past an unsealed throat.

Do you push or pull the handle to close a fireplace damper?

The required motion depends on whether your chimney uses a poker lever, a rotary screw handle, or a top-mounted cable. With standard poker-style throat dampers, lifting the arm slightly and pulling it forward toward the hearth drops the cast iron plate shut, while pushing backward latches it open into ratchet slots. Rotary controls require turning a metal knob to spin the threaded rod and lower the plate flat. Top-mount dampers use a cable inside the firebox; releasing the chain from its wall bracket allows the spring-loaded chimney cap to pull shut against the flue top.

Can you close the damper completely if you have vented gas logs?

No, you should never close the damper fully if your fireplace contains vented gas logs. Gas logs generate invisible fumes and carbon monoxide that require permanent venting through the chimney, which local building rules enforce for indoor safety. An all-steel Midwest Hearth damper clamp measuring 2 inches high by 1.5 inches wide attaches to the plate edge to keep the flue from shutting completely. If you are learning how to use a gas fireplace with key valves, keeping an all-steel stop clamp securely fastened is a mandatory part of that safe operation.

Why is the fireplace damper stuck, and how do you close it safely?

A damper plate usually binds when accumulated soot, rust scale, or dislodged mortar fragments lodge inside the hinge track. Directing a flashlight into the throat helps identify debris, which you can brush away rather than yanking the linkage and snapping old cast iron. Clearing hearth debris is simpler if your firebox floor features an ash dump like the Minuteman International AD-01, which uses a louvered door to sweep waste downward. If intense heat has permanently warped the cast iron frame, installing a replacement like the 30-inch Vestal throat damper (model VESTAL-30, measuring 34 inches wide and 6 inches high) restores a true closure.

How can you stop cold drafts if a closed damper still leaks air?

You can block persistent drafts by placing a physical barrier over the fireplace opening or inside the flue throat. Standard metal-to-metal throat dampers lack rubberized seals, meaning chilly air frequently seeps around the perimeter. A black magnetic fireplace blanket measuring 39 inches by 32 inches relies on twelve built-in magnets with 1.2 T suction force to grip iron frames and stop heat loss. Another option is a 13-inch by 35-inch XYGOVIA flue stopper with three loops of sewing thread, which you can trim to fit inside the flue pathway and keep cold drafts from dropping into the room during 2026.

Can a top-sealing chimney damper kit be installed on a gas log fireplace?

No, top-mounted seal tight dampers are engineered exclusively for open wood-burning masonry chimneys and are not intended for gas log flues. Kits like the 13-inch by 13-inch cast aluminum units from Anrain and US Fireplace Products feature a double gasket system that provides an airtight, waterproof seal against rain, snow, and frost. While this dual seal stops draft leakage and reduces heating waste for wood-fueled masonry setups, gas log installations require a continuous flue opening. Always confirm your fuel source and chimney dimensions before choosing a double-gasket top damper.