You’re probably losing heat through that unused fireplace without realizing it. A chimney balloon plug can seal the draft and lower your energy bills, but you’ll want to know which option works best for your flue size and home type. We’ve tested the leading products to help you make the right choice.
| Chimney Balloon Inflatable Fireplace Draft Stopper |  | Best Overall | Flue Type: Rectangular (17″x7″ to 21″x10″) | Material: Two-ply inflatable polyurethane | Installation Method: Inflate by mouth or air pump; easily deflates | CHECK ON AMAZON | Read Our Analysis |
| Fireplace Draft Stopper for Large Masonry Fireplaces |  | Best For Large Fireplaces | Flue Type: Rectangular damper (up to 38×16″) | Material: Inflatable polyurethane pillow with telescoping pole | Installation Method: Install below damper with telescoping pole support | CHECK ON AMAZON | Read Our Analysis |
| Chimney Sheep Fireplace Draft Stopper Plug (13″X35″) |  | Most Durable | Flue Type: Rectangular (13″x35″ or smaller) | Material: 100% Herdwick Wool (England) | Installation Method: Insert above firebox; trim with scissors | CHECK ON AMAZON | Read Our Analysis |
| Flueblocker Chimney Flue Draft Stopper Plug (8″-9″ Round) |  | Best For Round Flues | Flue Type: Round (8″-9″) | Material: 100% Herdwick Wool (England) | Installation Method: Insert above firebox; trim with scissors | CHECK ON AMAZON | Read Our Analysis |
| Chimney Sheep Wool Flue Plug Draft Stopper |  | Best For Small Flues | Flue Type: Round (5″-6″) | Material: 100% Herdwick Wool (England) | Installation Method: Insert above firebox; trim with scissors | CHECK ON AMAZON | Read Our Analysis |
| Chimney Sheep Fireplace Draft Stopper Plug (11″x19″) |  | Best For Rectangular Flues | Flue Type: Rectangular (11″x19″ or smaller) | Material: 100% Herdwick Wool (England) | Installation Method: Insert above firebox; trim with scissors | CHECK ON AMAZON | Read Our Analysis |
| Chimney Balloon 36″ Valve/Handle Extension |  | Best Accessory | Flue Type: Universal (works with any size Chimney Balloon) | Material: Plastic valve/handle extension | Installation Method: Attaches to Chimney Balloon valve stem | CHECK ON AMAZON | Read Our Analysis |
| 8″x 32″ Draft Excluder for Chimney Flue |  | Budget-Friendly Pick | Flue Type: Rectangular (8″x32″) | Material: 100% pure wool felt (1.0″ thick) | Installation Method: Insert above fireplace flue; trim to fit | CHECK ON AMAZON | Read Our Analysis |
| Wool Fireplace Draft Stopper Chimney Flue Plug (35x13in) |  | Most Adjustable | Flue Type: Rectangular (35″x13″) | Material: Dense wool felt with stainless steel handle | Installation Method: Insert deep into flue; adjustable steel handle (19-59″) | CHECK ON AMAZON | Read Our Analysis |
| Chimney Flue Plug 9″ Round Fireplace Draft Excluder |  | Best Value | Flue Type: Round (9″) | Material: 100% pure wool (1.0″ thick) | Installation Method: Insert above flue with telescopic adjustable rod (8.7″-29″) | CHECK ON AMAZON | Read Our Analysis |
More Details on Our Top Picks
Chimney Balloon Inflatable Fireplace Draft Stopper
If you’re looking for seasonal draft control without permanent installation, the Chimney Balloon 21×10 is your solution. This two-ply inflatable pillow fits rectangular flues from 17″x7″ to 21″x10″, featuring a seven-inch handle valve and two-foot inflation tube. You’ll inflate it by mouth or air pump, then easily deflate and remove when needed. Winter use blocks cold drafts and heat loss, while summer deployment stops smoky odors, noise, and debris. It creates an effective chimney seal that prevents outdoor pollution and wildfire smoke infiltration. Note: you cannot use this with active gas log sets—the gas log must be disabled first.
- Flue Type:Rectangular (17″x7″ to 21″x10″)
- Material:Two-ply inflatable polyurethane
- Installation Method:Inflate by mouth or air pump; easily deflates
- Gas Log Compatibility:Cannot be used with active gas log sets
- Primary Benefits:Blocks drafts, odors, heat loss; prevents pollution, smoke
- Ease of Removal:Easily deflates and removes when fireplace used
- Additional Feature:Fits 17″x7″ to 21″x10″
- Additional Feature:Includes two-foot inflation tube
- Additional Feature:Mouth or pump inflation
Fireplace Draft Stopper for Large Masonry Fireplaces
Do you have a brick fireplace that’s draining your home’s conditioned air like an open window? The Fireplace Draft Stopper for Large Masonry Fireplaces solves this problem efficiently. This product fits rectangular dampers up to 38×16 inches, making it compatible with most brick fireplaces. You’ll install an inflatable polyurethane pillow below your damper using a telescoping pole—quick, clean, and mess-free. The black components remain barely noticeable in your home. Once installed, you’ll reduce energy loss, downdrafts, odors, toxins, noise, and unwanted insects. Simply place one stopper in each fireplace and enjoy improved energy efficiency immediately.
- Flue Type:Rectangular damper (up to 38×16″)
- Material:Inflatable polyurethane pillow with telescoping pole
- Installation Method:Install below damper with telescoping pole support
- Gas Log Compatibility:Compatible with brick fireplaces (no gas restriction noted)
- Primary Benefits:Reduces energy loss, downdrafts, odors, toxins, noise, insects
- Ease of Removal:Quick removal (implied by quick installation)
- Additional Feature:Accommodates dampers up to 38×16″
- Additional Feature:Telescoping pole supports pillow
- Additional Feature:Black pillow barely noticeable
Chimney Sheep Fireplace Draft Stopper Plug (13″X35″)
The Chimney Sheep Fireplace Draft Stopper Plug (13″X35″) is your best choice if you’re looking for a durable, long-lasting solution to seal rectangular flue openings without the hassle of replacing ineffective balloons or fabric covers. Made from 100% Herdwick Wool, this plug fits openings up to 13″ x 35″ and resists punctures and deflation. Installation’s simple—just insert it above your firebox—and removal’s equally easy when you need your fireplace again. You’ll notice immediate improvements in draft prevention, odor elimination, and noise reduction. The wool’s natural density keeps it firmly in place, potentially paying for itself through energy savings in one heating season.
- Flue Type:Rectangular (13″x35″ or smaller)
- Material:100% Herdwick Wool (England)
- Installation Method:Insert above firebox; trim with scissors
- Gas Log Compatibility:Not for active vented gas log sets
- Primary Benefits:Stops drafts, odors, noise, debris; improves warmth
- Ease of Removal:Easy removal when fireplace use resumes
- Additional Feature:Trimmable with scissors
- Additional Feature:100% Herdwick Wool construction
- Additional Feature:Resists puncture and deflation
Flueblocker Chimney Flue Draft Stopper Plug (8″-9″ Round)
For homeowners with 8″ or 9″ round flue openings who want a reliable, long-lasting solution to draft problems, Flueblocker’s Chimney Flue Draft Stopper Plug delivers superior performance compared to traditional balloon or pillow covers. Made from 100% Herdwick Wool harvested in England, this stopper won’t deflate or puncture like inferior alternatives. You’ll appreciate its rigidity and durability, which keeps it securely in place without maintenance. Installation’s straightforward—simply insert it above your firebox. When you’re ready to use your fireplace, removal takes seconds. The plug effectively blocks drafts, odors, noise, and debris while improving warmth and reducing energy costs. Note: it’s incompatible with active gas logs, which must be disabled first.
- Flue Type:Round (8″-9″)
- Material:100% Herdwick Wool (England)
- Installation Method:Insert above firebox; trim with scissors
- Gas Log Compatibility:Not for active vented gas log sets
- Primary Benefits:Stops drafts, odors, noise, debris; improves warmth
- Ease of Removal:Easy removal when fireplace in use
- Additional Feature:Fits 8″ or 9″ round
- Additional Feature:Scissors-trimmed sizing adjustment
- Additional Feature:Herdwick Wool durability
Chimney Sheep Wool Flue Plug Draft Stopper
Homeowners seeking a permanent, maintenance-free solution to fireplace drafts will find the Chimney Sheep Wool Flue Plug Draft Stopper an ideal choice. This round plug fits 5 and 6-inch flue openings and measures 7.5 inches in diameter, so you can trim it with scissors for a custom fit. Made from 100% Herdwick wool sourced from England, it’s naturally renewable, dense, and rigid enough to stay in place without deflating. You’ll insert it above your firebox to eliminate drafts, odors, noise, and debris while improving warmth and energy efficiency. Just disable any gas logs first, then enjoy years of reliable performance.
- Flue Type:Round (5″-6″)
- Material:100% Herdwick Wool (England)
- Installation Method:Insert above firebox; trim with scissors
- Gas Log Compatibility:Not for active vented gas log sets
- Primary Benefits:Stops drafts, odors, noise, debris; improves warmth
- Ease of Removal:Easily removable
- Additional Feature:Fits 5, 6″ round openings
- Additional Feature:Naturally rigid wool material
- Additional Feature:Scissors-trimmable fit adjustment
Chimney Sheep Fireplace Draft Stopper Plug (11″x19″)
If you’re dealing with a rectangular flue opening measuring 11″x19″ or smaller, the Chimney Sheep Fireplace Draft Stopper Plug offers a straightforward solution for sealing drafts without the hassle of balloons or fabric covers. Made from 100% Herdwick Wool imported from England, this naturally renewable material stays securely in place without puncturing or deflating. You’ll install it easily by inserting it into your fireplace flue just above the firebox, and remove it just as quickly when you’re ready to use your fireplace. The plug effectively blocks drafts, odors, noise, and debris while potentially paying for itself in a single heating season. Remember: don’t use this with active vented gas log sets—you’ll need to disable or remove them first.
- Flue Type:Rectangular (11″x19″ or smaller)
- Material:100% Herdwick Wool (England)
- Installation Method:Insert above firebox; trim with scissors
- Gas Log Compatibility:Not for active vented gas log sets
- Primary Benefits:Stops drafts, odors, noise, debris; energy savings potential
- Ease of Removal:Easily removed when ready to use fireplace
- Additional Feature:Fits 11×19 or smaller
- Additional Feature:One heating season payback
- Additional Feature:100% Herdwick Wool imported
Chimney Balloon 36″ Valve/Handle Extension
When you’re working inside your fireplace and can’t comfortably reach the valve on your Chimney Balloon, the 36″ Valve/Handle Extension is your solution. This accessory permanently attaches to your balloon’s valve stem, extending your reach by 36 inches so you can control inflation and deflation from your workspace inside the fireplace. You’ll find it invaluable for hard-to-access locations or installations difficult from ground level. Use the simple rule of thumb: if you can reach a spot with a yard stick, you’ll benefit from this extender. It works with any size Chimney Balloon and includes an additional valve for added convenience.
- Flue Type:Universal (works with any size Chimney Balloon)
- Material:Plastic valve/handle extension
- Installation Method:Attaches to Chimney Balloon valve stem
- Gas Log Compatibility:Depends on Chimney Balloon model compatibility
- Primary Benefits:Enables higher installation and easier valve control
- Ease of Removal:N/A (accessory extension only)
- Additional Feature:Extends handle 36 inches
- Additional Feature:Permanently attaches to valve
- Additional Feature:Controls inflation from workspace
8″x 32″ Draft Excluder for Chimney Flue
Sealing drafty fireplaces during off-seasons shouldn’t require expensive renovations or complicated installations—you’ve got a simpler solution with the 8″ x 32″ Draft Excluder. This rectangular wool plug blocks airflow, heat loss, odors, and unwanted debris in one step. Made from 100% pure wool, it’s naturally dense and durable, providing an excellent seal when inserted above your flue opening. You’ll simply remove the damping bar when you’re ready to use your fireplace. Since it’s flexibly trimmable, you can customize the fit for your specific flue dimensions. Many homeowners find this investment pays for itself within a single heating season through reduced energy costs.
- Flue Type:Rectangular (8″x32″)
- Material:100% pure wool felt (1.0″ thick)
- Installation Method:Insert above fireplace flue; trim to fit
- Gas Log Compatibility:Not for movable gas devices
- Primary Benefits:Reduces airflow, heat loss; blocks odors, noise, debris, insects
- Ease of Removal:Remove damping bar from flue plug when using fireplace
- Additional Feature:1.0 inch thick blocker
- Additional Feature:Two loops sewing thread
- Additional Feature:One heating season payback
Wool Fireplace Draft Stopper Chimney Flue Plug (35x13in)
Homeowners with wood-burning fireplaces who want to eliminate energy-wasting drafts during off-season months’ll find the Wool Fireplace Draft Stopper Chimney Flue Plug an excellent solution. This 35×13-inch wool felt blocker customizes to fit your flue perfectly—simply trim with scissors for a snug seal. The adjustable stainless steel handle extends 19–59 inches, allowing you to place and retrieve the plug deep within your chimney effortlessly. Installation requires no tools, making seasonal setup quick and hassle-free. The dense wool felt blocks airflow effectively, preserving indoor temperature while preventing dust and debris from entering when your fireplace sits idle. Remember to insert only after your fire completely dies out.
- Flue Type:Rectangular (35″x13″)
- Material:Dense wool felt with stainless steel handle
- Installation Method:Insert deep into flue; adjustable steel handle (19-59″)
- Gas Log Compatibility:Incompatible with actively venting gas fireplace sets
- Primary Benefits:Blocks drafts, odors, dust, debris; preserves indoor temperature
- Ease of Removal:Quick retrieval with adjustable handle
- Additional Feature:Adjustable stainless steel handle
- Additional Feature:Extends 19–59 inches
- Additional Feature:Tool-free installation method
Chimney Flue Plug 9″ Round Fireplace Draft Excluder
The 9″ Round Fireplace Draft Excluder is your ideal solution if you’re tired of warm air escaping through unused chimneys. This plug features a 1-inch-thick pure wool blocker that creates a perfect seal, considerably reducing airflow and heat loss while blocking drafts, odors, noise, and debris. Installation is straightforward—simply insert the damper above your fireplace flue without needing fabric covers. The telescopic adjustable rod extends from 8.7″ to 29″, accommodating various flue sizes. Remember to remove the damping bar when using your fireplace. Avoid placing it near insects, pets, or charcoal ash, and don’t use it with movable gas devices. Contact support within 24 hours if issues arise.
- Flue Type:Round (9″)
- Material:100% pure wool (1.0″ thick)
- Installation Method:Insert above flue with telescopic adjustable rod (8.7″-29″)
- Gas Log Compatibility:Not for movable gas devices
- Primary Benefits:Reduces heating costs; blocks drafts, odors, noise, debris, insects
- Ease of Removal:Retractable telescopic rod for easy removal
- Additional Feature:Telescopic rod extends/retracts
- Additional Feature:8.7″ to 29″ range
- Additional Feature:1.0 inch thick blocker
Factors to Consider When Choosing Chimney Balloon Plugs to Seal Unused Fireplaces in Minutes
When you’re selecting a chimney balloon plug, you’ll want to verify it matches your flue’s dimensions for proper sealing and consider the material’s durability to withstand temperature fluctuations. You should also evaluate how quickly and easily you can install it, verify that it meets gas fireplace safety standards if applicable, and calculate the seasonal energy savings you’ll gain from preventing drafts. These factors work together to determine whether a particular plug will effectively serve your home’s needs.
Flue Opening Size Compatibility
How do you know which chimney balloon plug will fit your fireplace? Start by measuring your flue opening, since sizing directly impacts sealing effectiveness.
For rectangular flues, you’ll typically find plugs ranging from 7″–21″ in width and 7″–10″ in height. Round openings need plugs sized between 5″–12″ in diameter. The key is selecting a plug that’s slightly larger than your opening, allowing you to trim it down for a snug, gap-free seal.
Larger brick or masonry chimneys require inflatable or solid plugs accommodating dampers up to 38″ x 16″. Always verify your plug matches your fireplace type before purchasing. Proper sizing guarantees maximum energy efficiency and prevents air leakage.
Material Durability and Performance
Once you’ve found the right size, material selection becomes your next consideration in ensuring your chimney balloon performs effectively over time. You’ll want products made from 100% Herdwick Wool, which offers dense, durable construction that resists puncturing or deflating. This material naturally maintains its form throughout seasonal use without degrading, providing consistent performance year after year.
The approximately 1-inch thickness creates a tight, high-performance seal that substantially reduces airflow and heat loss. You’ll benefit from wool’s inherent heat-preserving properties, which keep your plug secure during use while minimizing drafts, odors, and noise penetration. Additionally, trim-to-fit designs allow you to customize the seal, eliminating gaps that could compromise durability. These renewable materials deliver reliable, long-lasting protection for your unused fireplace.
Installation Speed and Ease
Why spend hours on complicated fireplace sealing when you can install a chimney balloon plug in minutes? You’ll appreciate how straightforward the process is. Simply insert the draft stopper into your flue just above the firebox, then inflate or position the pillow. When you need your fireplace again, just deflate or pull it out.
Many options eliminate messy setup entirely, skipping balloons or fabric covers for cleaner installation. If your opening’s slightly larger, you can easily trim the plug with scissors for a tight seal. Some models feature telescoping poles that let you position everything from ground level without climbing or special tools. One-person setup means you can seal multiple fireplaces rapidly, making chimney balloon plugs an efficient solution for unused fireplaces.
Gas Fireplace Safety Requirements
Before you install a chimney balloon plug, you’ll need to take critical safety precautions if your fireplace uses gas. First, disable or remove any active vented gas log set before deploying the blocker—never use plugs with functioning gas appliances. Verify that your gas line has no leaks and that there’s no lingering ignition risk before sealing the flue. Guarantee all gas devices are permanently powered off and safe.
Clear the area around your fireplace of ignition sources during installation. Review the manufacturer’s safety notes specific to vented gas systems. Never insert a draft stopper while gas combustion is active, as this interferes with airflow and creates dangerous conditions. Taking these precautions protects your home and ensures safe, effective fireplace sealing.
Seasonal Energy Savings Potential
Installing a chimney balloon plug can considerably reduce your heating costs by sealing the flue and preventing warm air from escaping up the chimney. You’ll realize the most significant savings during winter months when your fireplace remains unused and your gas log is disabled or removed. Wool-based flue blockers create tight seals that retain heated air efficiently throughout your home. The energy savings often pay for themselves within a single heating season, depending on your climate and heating usage patterns. Beyond temperature control, you’ll benefit from reduced odors, noise, and debris entering through the chimney. These secondary advantages contribute to a more comfortable living environment while maximizing your heating efficiency. Properly installed plugs guarantee your investment delivers substantial long-term value.
Removal and Reusability Features
How easily can you access your fireplace when you’re ready to use it again? Quality chimney balloon plugs prioritize tool-free removal, letting you regain fireplace access without hassle. You’ll appreciate models designed for repeated seasonal use—simply remove them when heating season arrives, then reinsert them when you’re done.
Many blockers feature trimming capabilities, allowing you to customize them for your flue’s dimensions. This flexibility guarantees clean reinstallation year after year. Durable materials like wool maintain their shape through multiple removal cycles, preventing deterioration that could compromise effectiveness.
Frequently Asked Questions
Can Chimney Balloon Plugs Damage Historic or Older Fireplace Structures?
You can damage historic fireplaces if you’re not careful. You’ll want to avoid inflating balloons too forcefully, as they can stress old mortar and brick. You’re better off consulting a preservation expert first.
How Long Do Chimney Balloon Plugs Typically Last Before Needing Replacement?
You’ll typically get 3-5 years of use from a chimney balloon plug before you’ll need to replace it. They’re durable, but UV exposure, temperature fluctuations, and material degradation gradually weaken them over time.
Are Chimney Balloon Plugs Safe to Use With Active Wood-Burning Stoves?
You shouldn’t use chimney balloon plugs with active wood-burning stoves. They’re designed only for sealing unused fireplaces. When you operate your stove, you’ll need the chimney open for proper ventilation and safety.
What’s the Difference Between Inflatable Balloons and Wool Draft Stoppers Functionally?
You’ll find inflatable balloons create an airtight seal that you can adjust precisely, while wool draft stoppers rely on density to block airflow. Balloons work better for irregular openings; stoppers suit consistent gaps.
Do Chimney Plugs Work Effectively in Chimneys With Irregular or Damaged Flues?
You’ll find chimney plugs less effective in irregular or damaged flues because they can’t seal properly against uneven surfaces. You’re better off having a professional inspect and repair your flue first before installing any plug.
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