How do I determine the correct size for my fireplace flue?

Measure your flue's interior and choose a Flueblocker the same size or slightly larger. The wool pad pressure-fits and can be trimmed with scissors. Use the sizing guide to match your flue shape—round, square, or rectangular.

How difficult is installation? Do I need any special tools or supports?

Choose an install spot you can reach by hand. Measure with a tape or ruler. A narrow area above the firebox is ideal. For higher spots, use 6” handle extenders to place the wool pad securely.

Will the product completely block cold drafts, odors, and heat loss?

When fitted correctly, the FlueBlocker stops heating/cooling loss, drafts and odors from a dormant chimney. To eliminate odor, make sure you vacuum out all the ash from the firebox and seal any ash chute or outside intake attached to the firebox.

Which is right for my situation – a FlueBlocker or a Chimney Balloon?

The Flueblocker is a durable, reusable chimney plug that handles moisture and is ideal for long-term use. The Chimney Balloon offers a tight seal and a breakaway feature for safety if a fire is lit accidentally.

How durable is the material? Is it worth the price?

Chimney is harsh, moist, acidic environments. The Flueblocker uses coarse ionized Herdwick wool and durable resin hardware to seal air, wick moisture and resist odors. Chimney Balloons use a heat-reactive laminate to withstand chimney air conditions.

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Flueblocker for 13"x35" Chimney - Draft Stopper Wool Fireplace Plug

Flueblocker for 13"x35" Chimney - Draft Stopper Wool Fireplace Plug

Product ID: 240089228

Details

Brand
Flueblocker
Color
Natural
Material
Wool
Maximum Gap Fill
13 inches
Product Dimensions
36"L x 14"W x

🐑100% Herdwick wool - natural & renewable

📏Fits up to 13"x35" flue - custom trim for perfect fit

🔥Blocks drafts & heat loss - IECC 2009 compliant

59551 som

Duties & taxes included

In stock

Sold byAmazon KyrgyzstanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🐑 Seal in warmth, block out the chill—your fireplace’s new best friend!

SUSTAINABLE WOOL POWER - Crafted from dense Herdwick wool, this plug offers eco-friendly durability that lasts over a decade.
PRECISION FIT ZERO HASSLE - Trim to size and install in seconds—no tools, adhesives, or complicated setups required.
YEAR ROUND COMFORT BOOSTER - Seals out cold drafts, odors, and noise while locking in your home's warmth through multiple seasons.
ENERGY SAVINGS THAT PAY OFF - Meets energy code standards and can reduce heating bills enough to cover its cost in one season.
TRUSTED TAX CREDIT ELIGIBLE - Recommended by pros, backed by warranty, and may qualify for federal tax incentives under the Inflation Reduction Act.

The Flueblocker for 13"x35" chimneys is a reusable, pressure-fit wool draft stopper made from 100% natural Herdwick wool. Designed to block drafts, odors, and heat loss, it fits rectangular flues up to 13"x35" and installs in seconds without tools. Durable for 10+ years, IECC 2009 compliant, and potentially eligible for federal tax credits, it’s the smart, sustainable solution for energy-conscious homeowners and renters.

Specifications

ASIN	B08K1J95ZT
Best Sellers Rank	#264,707 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #21 in Fireplace Chimney Caps
Brand Name	Flueblocker
Color	Natural
Customer Reviews	4.4 4.4 out of 5 stars (425)
Global Trade Identification Number	00852586007252
Item Dimensions L x W x Thickness	36"L x 14"W x 1"Th
Item Weight	2.6 pounds
Manufacturer	Chimney Sheep
Manufacturer Part Number	FB13x35REC
Manufacturer Warranty Description	1 year limited warranty.
Material Type	Wool
Maximum Gap Fill	13 inches
Model Number	FB13x35REC
Number of Items	1
Number of Pieces	1
Unit Count	1 Count

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

Anita G.

Good experience, but the tracking updates could be better.

2 months ago

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