2147C Fletcher Ave Indianapolis, IN, 46203   800.897.8481   317.636.0751   Facebook   Twitter

Liners

M-FLEX Liner
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M-FLEX Liner Kit

M-FLEX liner is made from 316L stainless steel and is designed to reline existing chimneys or to be used in new construction. National Chimney manufactures M-FLEX liner from the highest grade mill certified stainless steel alloy. It is made from a continuous strip of 7-ply stainless steel that is interlocked and crimped to produce a gas and watertight lining system of superior strength and durability. Its corrugated construction allows for expansion and contraction during heat up and cool down periods, removing any stress on the system.
Aluminum Liner
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Aluminum Liner

National Chimney's 2-Ply 3003 aluminum liner can be used to vent Category I gas appliances with A.F.U.E. of 83% or lower. In many cases, especially when only water heaters are vented into masonry flues, the gas appliances are vented into oversized flues. This practice may cause serious condensation and performance problems. By relining the chimney with National Chimney M-FLEX aluminum liner you can reduce the condensation problem and improve the performance of the appliances.
M-FLEX AL29-4C Liner for High Efficiency Gass Applications
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M-FLEX AL29-4C Liner
for High Efficiency Gass Applications

This M-Flex Chimney liner has the greatest acid fighting capability! Our unique manufacturing system used to make M-Flex, utilizes a continuous strip of stainless steel, interlocked and diagonally crimped to produce a gas and watertight seam of superior strength & durability. Its corrugated construction allows for expansion and contraction during the heat up and cool down periods, removing any stress on the system. AL29-4C liner is used to vent gas appliances that burn 84% effcient or higher.
Smoothwall Liner 316
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Smoothwall Liner 316

National Chimney manufactures Smoothwall Liner (SW) that has superior flexibility with a high BTU capacity. Its smooth interior allows for more airflow, reducing drag by 20% over traditional corrugated liners. Smoothwall is made from 2-ply 316 stainless steel which makes it ideal for any application. It is compatible with our all fuel components or with our wood or wood pellet components.
Premier Flex Heavywall Liner
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Premier Flex Heavywall Liner

Premier Flex is extremely durable and made from .015 Stainless Steel. It features an interlocked design to maximize strength and flexibility. It's the most rugged liner we recommend for those tight winch-able situations. Premier Flex 316 can be used for all fuel burning appliances including; wood, wood pellet, oil, gas, and corn. Premier Flex 304 can be used for wood burning appliances. Premier Flex can withstand being ovalized and rectanglized to accommodate for unusual offsets or rectangular chimneys. When a liner is taken "out of round" it does reduce the cross sectional area. If you need help sizing a liner, please call 800-897-8481.
Premier Flex Lite
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Premier Flex Lite

As the chimney industry changes, National Chimney adapts to fulfill our customers' needs. Premier Flex Lite Liner has the same quality and technology as our standard Premier Flex Liner except it is much lighter. It is constructed of .010" thick steel as opposed to the standard heavy wall .015" thick steel. The thinner steel has the durability of the heavy wall liner but at a more manageable weight. Offered in 304 and 316 L/Ti. See our M-Flex Smoothwall Chimney Liner, if you need a liner that reduces sizing by 20%.
Premier Rigid Lining System
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Premier Rigid Lining System

The Premier Rigid lining systems are constructed of high grade, 24 gauge stainless steel. Available in 316 alloy (SSL) for all fuel applications and 304 alloy (SS) for wood burning applications. To ensure the tee fits properly use an "OD" tee. Rigid liner systems also require the use of a standard top plate, top clamp, storm collar and liner rain cap.
UL Listed up to 40" Diameter. Call for pricing on 13"-40".
M-FLEX Pre-Insulated Liner
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M-FLEX Pre-Insulated Liner

National Chimney now offers preinsulated M-Flex Stainless Steel chimney liners with your choice of a Stainless or Aluminum outer protective liner. The Aluminum outer liner offers better flexibility and ease of handling, whereas the Stainless Steel outer liner offers more durability.
Both are manufactured using our highest quality, mill certified 316L Stainless Steel M-Flex inner liner and our ½" insulation wrap. This convenient liner will save you time and frustration on the job. Most liners can ship FedEx Ground. Liners of 8" or larger diameters ship via common carrier. These liners are also available in our Standard and Basic Kits.

Liner Kits

Smoothwall Standard Liner Kit
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Smoothwall Standard Liner Kit

M-FLEX Smoothwall Standard Liner Kits are used for the same applications as the standard M-FLEX liner kits. However, the Smoothwall Standard Liner Kits offer superior flexibility with a higher BTU capacity. Each of our smoothwall standard kits comes with installation instructions and a lifetime warranty. We stock 3"-8" inside diameter (ID) kits.
Smoothwall Basic Liner Kit
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Smoothwall Basic Liner Kit

Made with the same quality as our Smoothwall Standard Liner Kit; this kit is specialized for fireplace insert applications where a tee and tee end cap are not needed. This kit has been outfitted with our stove adapter. The stove adapter accepts our liner into the top female end with our EZ clamp to tighten it in place and slips into the top of a stove or insert collar.
M-FLEX Standard Liner Kit
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M-FLEX Standard Liner Kit

M-FLEX standard liner kits are used for wood, oil, coal, and gas appliances. Each of our .006" (CB) and .005" (CBF) standard kits comes with installation instructions and a lifetime warranty. This lining kit has been installed in venting applications since 1992 and continues to be the most popular "all fuels" kit we offer. We stock 3"-8" inside diameter (ID) as well as 6"-8" outside diameter (OD) in our .006" (CB). OD kits are the same price as ID kits, just add OD to the part number when ordering. For example: CB625KITOD
M-FLEX Basic Liner Kit
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M-FLEX Basic Liner Kit

Made with the same upstanding quality as our CB Standard Kit; this kit is specialized for fireplace insert applications where a tee and tee end cap are not needed. This kit has been outfitted with our stove adapter designed by those in the field. Made to accept our liner into the top female end with our EZ clamp to tighten it in place. The stove adapter slips into the top of the stove or insert's collar for an easy transition to the stove or other application.
M-FLEX Pellet/Corn Liner Kit
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M-FLEX Pellet/Corn Liner Kit

The pellet/corn kits are similar to our Standard Kits and our Basic Kits. The primary difference is the short body tee that goes at the bottom of the liner. Each pellet tee is designed specifically to connect our liner to the pellet stove. Insert the liner into the top of the tee body, tighten the clamps, and put the snout around the outside of the pellet stove opening.
M-FLEX Aluminum Liner Kits
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M-FLEX Aluminum Liner Kits

National Chimney manufactures our M-FLEX aluminum liner kits for appliances with A.F.U.E. of 83% or lower. Each aluminum kit comes professionally packed and includes:
• UL Listed and Tested 2-ply aluminum liner
• Aluminum mortar collar for slipping the liner through the thimble
• Aluminum top plate with a 16"x 16" plate and a 2" high collar around the hole diameter
• Aluminum cap, and installation instructions
All M-FLEX aluminum liner kits come with a 25-year warranty and are listed to UL441.
Aluminum High Wind
Co-Linear Kit
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Aluminum Low Profile
Co-Linear Kit
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Low Profile Co-Linear Kit
Aluminum

Low Profile Co-Linear Caps and Kits—A sleek and unique cap with an installed height of just 7". Our Low Profile Co-Linear Cap is manufactured using the highest quality commercial grade aluminum. This cap comes with a 3" air intake and has the option of a 3" or 4" exhaust. EZ connect bands connect the liner to each collar, eliminating the need for screws and rivets. Each Low Profile Cap comes with a standard 13"x13" flashing; an 18"x18" flashing is also available. Transferable Lifetime Warranty for Stainless Steel; 25-Year Warranty for Aluminum.
Stainless High Wind Co-Linear Kit
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High Wind Co-Linear Kit
Stainless Steel

High Wind Co-Linear Caps and Kits—A great option for applications where wind is a challenge for venting systems. Our High Wind Co-Linear Cap is manufactured using the highest quality mill certified 24 gauge 304 stainless steel. The cap comes with a 3" air intake and has the option of a 3" or 4" exhaust. EZ connect bands connect the liner to each collar, eliminating the need for screws and rivets. Each High Wind Cap comes with a standard 13"x13" flashing. Additional flashings for Factory Chimneys are available. Transferable Lifetime Warranty.
Stainless Low Profile Co-Linear Kit
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Low Profile Co-Linear Kit
Aluminum

Low Profile Co-Linear Caps and Kits—A sleek and unique cap with an installed height of just 7". Our Low Profile Co-Linear Cap is manufactured using the highest quality commercial grade aluminum. This cap comes with a 3" air intake and has the option of a 3" or 4" exhaust. EZ connect bands connect the liner to each collar, eliminating the need for screws and rivets. Each Low Profile Cap comes with a standard 13"x13" flashing; an 18"x18" flashing is also available. Transferable Lifetime Warranty for Stainless Steel; 25-Year Warranty for Aluminum.
Fresh Air Kit
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Fresh Air Kit

The proper amount of fresh combustion air is brought in with the Fresh Air Kit directly to wood or pellet stoves ensuring optimal performance. Fresh Air Kits include: 4" x 10' M-FLEX aluminum liner, 10' insulation sleeve, exterior intake, and 2 hose clamps.

Liner Caps & Top Kits

Low Profile Co-Linear Cap
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Low Profile Co-Linear Kit

Choose from Stainless Steel or Aluminum.
High Wind Co-Linear Cap
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High Wind Co-Linear Kit

Choose from Stainless Steel or Aluminum.
Stainless Square Co-Linear Caps
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Stainless Square
Co-Linear Caps

Stainless Steel Square Co-Linear Caps—our premier cap for your Direct Venting needs. Our cap is manufactured using the highest quality mill certified 24 gauge 304 stainless steel. The cap comes with a 3" air intake and has the option of a 3" or 4" exhaust. EZ connect bands connect the liner to each collar, eliminating the need for screws or rivets.Each Premier Cap comes with a built in 15"x15" stock flashing.
Rain Cap
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Round Lid Liner Rain Cap with Diverter Cone
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Top Kit with Diverter Cone
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Round Lid Liner Rain Cap
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Liner Rain Cap with Diverter
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Liner Cap
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Top Kit TK
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Premier Top Kit PTK
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Flue Fit Premier Top Kit TKFF
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Top/Support Clamp TC
Available Shapes
Top/Support Clamp

Shapes:
Circle, Oval, Rectangle, and Square

Top Kit Extensions
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Couplers & Adapters

Pre-Insulated Finishing Retainer
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Pre-Insulated Finishing Retainer

Made from 24ga 304 stainless steel, this retainer is used to "finish off" the end of the liner to protect the insulation from harm. Use the EZ Connect Band to secure the retainer to the outside of the liner.
Pre-Insulated Liner Finishing Plug
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Pre-Insulated Liner
Finishing Plug

Made from 24ga 304 stainless steel. This plug is used to complete the chimney termination of Pre-Insulated liner. The collar with the band on the outside fits over the outer liner. The smaller collar is designed to accept the inner liner. To finish the installation, you can purchase a "Top Kit Rain Cap" which easily connects to the smaller collar with the same EZ Band Clamp connection.
Pre-Insulated Stove Adapter
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Pre-Insulated Liner Stove Adapter

This adapter is used to connect the Pre-Insulated liner to your wood stove or insert. The Pre-Insulated liner fits fully into the large end of the adapter and the EZ Band Clamp secures the liner in place. The small end collar is crimped to fit inside the appliance's stove collar. Made from 24ga 304 stainless steel.
Pre-Insulated Liner Coupler
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Pre-Insulated Liner Coupler

This coupler is used to join (2) pieces of Pre-Insulated Liner together. It is designed to provide a dripless connection having both a female and a male end. The EZ Clamp Bands on both ends of the coupler ensures a secure connection on both ends of the liner. It is made from 24ga 316 stainless steel so it can be used for wood, oil, gas, and coal applications.
Coupler (Male/Female)
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Coupler (Male/Male)
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Aluminum Coupler
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Appliance Adapter
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EZ Coupler (Male/Female)
Available Shapes
EZ Coupler

Shapes:
Circle, Oval, Rectangle, and Square

Inside Mount Stove Adapter
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Motar Collar
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Bottom Plates

Round Coupler Style Mesh
Bottom Plate
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Rectangle Coupler Style Bottom Plate
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Rectangle Coupler Style Mesh Bottom Plate
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Bottom Plate
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Mesh Bottom Plate
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Top Plate TP
Available Options
Top Plate TP

Shapes:
Circle, Oval, Rectangle, and Square

Metals:
Stainless Steel and Aluminum
EZ Top Plate TPEZ
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EZ Flue Fit Top Plate EZFF
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Nose Cones & Storm Collars

Nose Cone
Available Shapes
Nose Cone

Shapes:
Circle, Oval, Rectangle, and Square

Storm Collars
Available Shapes
Storm Collars

Shapes:
Circle, Oval, Rectangle, and Square

Tees & Caps

Double Take-Off Swivel Tee
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Double Take-Off Swivel Tee

This style tee has two takeoffs with a unique feature of the tee body having the capability to spin 360°. This enables both take-offs to act independently of each other and allows you to position each take-off to whatever angle is required. Standard 2 inches between the take-offs. This tee has all the standard features of our regular two-part tee with removable take-offs and EZ Band Connection at the top of the tee. Made from 24ga 316 stainless steel.
Swivel Top Tee
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Swivel Top Tee

This swivel top tee has a top liner connection which spins 360°. During liner installation it is sometimes difficult to get the tee body connection to align properly with the thimble. The advantage to this swivel feature is you can spin the tee body from the thimble without having to turn the entire liner from the top of the chimney. This tee will save valuable time from having to turn the liner by hand at the top of the chimney. This tee has all the same features as our standard 24ga 316 and 304 style tees.
Stacked Tees
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Slip Connector
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Tee Snout
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Stove Adapter SA
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Fixed Tee FXTL(L)
Available Shapes
Fixed Tee

Shapes:
Circle, Oval, Rectangle, and Square

Pellet Tee FXTP
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2 Part Tee TEE(L)/FLEXT(L)
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Extended Tee Snouts SL/S
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Tee End Cap EC(L)
Available Shapes
Double Take-Off Swivel Tee

Shapes:
Circle, Oval, Rectangle, and Square

Universal Takeoff
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Elbows

15 Deg Fixed for Flex
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30 Deg Fixed for Flex
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45 Deg Fixed for Rigid
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45 Deg Adj. for Flex
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60 Deg Fixed for Rigid
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60 Deg Fixed for Flex
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90 Deg Fixed for Rigid
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90 Deg Fixed for Flex
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90 Deg Adj. for Rigid
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90 Deg Adj for Flex
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Redusers & Increasers

Plug Reduser/Increaser
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Plug Reduser/Increaser

National Chimney does not crimp our reducer/increaser so you can choose which end needs crimping for your application. Reducer/Increasers are available in 304 (wood and wood pellet applications) or 316 (all fuel applications). Choose from a 3 piece/tapered design for maximum flow or our plug style for tight spots.

National Chimney offers a reducer made specifically for pellet stove installations. The 4"-3" pellet reducer is also available as a 3 piece/tapered design or plug style. The 4" female end attaches to the outside of our M-FLEX or Smoothwall Liner then goes directly to the outside of the 3" pellet stove opening.
3 Peice Tapered Reduser/Increaser
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3 Peice Tapered Reduser/Increaser

National Chimney does not crimp our reducer/increaser so you can choose which end needs crimping for your application. Reducer/Increasers are available in 304 (wood and wood pellet applications) or 316 (all fuel applications). Choose from a 3 piece/tapered design for maximum flow or our plug style for tight spots.

National Chimney offers a reducer made specifically for pellet stove installations. The 4"-3" pellet reducer is also available as a 3 piece/tapered design or plug style. The 4" female end attaches to the outside of our M-FLEX or Smoothwall Liner then goes directly to the outside of the 3" pellet stove opening.
Oval Reduser/Increaser
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Oval Reduser/Increaser

Ordering ovalized tees and nose cones? You need to know what your ID (Inside diameter) or OD (outside diameter) of the round liner (before the liner is ovalized). For example, if the liner was a CB625 (which is ID) and it was ovalized down to 5", you would need an ID tee = NC65OVFLEXT. If the liner was a CB625OD (which is OD) you would need an OD tee = NC65OVTEE.
Oval to round adapter

The oval end of the adapter is made to accept ovalized inside diameter (ID) liner. The round bottom end is crimped and made to go into stovepipe or inside the stove's collar.

Boots & Adapters

Insert Boot
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Insert Boot

National Chimney manufactures insert boots with 24ga 304 stainless steel. They are designed to attach rigid pipe or flexible liner with a coupler to the exhaust vent of most inserts.
Insert Adapter
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Insert Adapter

National Chimney manufactures a unique insert adapter that allows a front-to-back or a side-to-side adjustment in the firebox. The two piece design allows it to slide to adjust the center-to-center distance of the collars. This accommodates a horizontal offset from 0" to 9" without the added clearance required for elbows. The top collar accepts OD flex liner or rigid pipe. It will also accept ID pipe in conjunction with a coupler. The bottom collar will fit into most stoves that require a crimped connection. Attaches with screws or rivets like most liner or pipe. Custom adapters are also available with clean out door.
Liner Insert Adapter
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Liner Insert Adapter

National Chimney manufactures a unique Insert Adapter that allows a front-to-back and side-to-side adjustment in the firebox. The two-piece design allows the unit to slide to adjust the center distance between collars. The 6" adapter when fully closed has a 6" center-to-center measurement and when fully extended has a 12" measurement between the collars. The 8" adapter has a 7" measurement between the centers of the collars and a 12" distance between collars when fully open. The top collar on both 6" and 8" adapters accepts "I.D." Flex Liner and the bottom collar is crimped to fit into most stoves or inserts. Made from 24ga 304 stainless steel this adapter attaches with self-tapping screws or rivets. Clean-out door comes standard.

Other

Tin Snips
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Tin Snips

With multi-operational latch, extra long life compression spring, nylon lower grip, riveted handle will not loosen. Tips of jaws ground to point allow access in tight quarters.
Duct Tape
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Duct Tape

Wrap the ends of our liners for safety. General purpose cloth duct tape, poly-coated, high tack adhesive, easy tear.
Premier Winch
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Premier Winch

The Premier Winch measures 15" x 15" at the base to fit even the smallest chimney. It has a capacity of 1000 lbs, yet weighs only 28.5 lbs. Comes with 50 ft of 7/32" cable. One leg adjusts for a rock free set on any surface.
Ovalizer
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Ovalizer

Need an ovalized size?
You can ovalize it yourself at the job site with your own Ovalizer.
Crimper
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Crimper

Crimper offers maximum ease of operation with spring-actuated handles and vinyl cushioned grip. Wear resistant, hardened steel construction crimps result in tighter fitting, leak proof connection.
Hand Pop Rivet Gun
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Hand Pop Rivet Gun

Secure the rigid lining system using a hand pop rivet gun, rivets, and washers or with stainless steel self tapping screws.