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Liner Kits

M-Flex Standard Liner Kits
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) and .005” (CBF) liners.

M-Flex Basic Liner Kits
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 Kits
Pellet/Corn Liner Kits
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 Kit
Aluminum Liner Kit
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.

Fresh Air Kit
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.
Smoothwall Kits

Smoothwall Standard Liner Kit
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
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.
Co-Linear Kits

Aluminum Low Profile
Co-Linear Kit
Aluminum Low Profile Kit
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.

Aluminum High Wind
Co-Linear Kit
Aluminum High Wind Kit
  • Includes Stainless Steel Termination
  • Commercial Grade Aluminum
  • EZ connect bands
  • Warranty for Aluminum

Stainless Steel Low Profile
Co-Linear Kit
Aluminum High Wind Kit
    For more information please consult National Chimneys catalog or contact National Chimney.

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Stainless Steel High Wind
Co-Linear Kit
Stainless Steel Wind Kit
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.
Co-linear Caps

Aluminum Low Profile
Co-Linear Cap

Aluminum High Wind
Co-Linear Cap

Stainless Steel Square
Co-Linear Caps
Aluminum Low Profile Kit
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.
M-Flex Liners

M-FLEX Liner
M-FLEX Liner
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.

M-Flex Basic Liner Kits
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 Kits
Pellet/Corn Liner Kits
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 Kit
Aluminum Liner Kit
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.

Fresh Air Kit
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.