What is AL29-4C alloy in a stainless chimney liner ?
"AL" stands for Allegheny Ludlum a unique patented alloy. This alloy was developed to prevent corrosion and breakdown in high efficient gas,oil, and corn burning chimney appliances. AL294C flexible chimney liners offer extreme resistance to chloride pitting, sulfuric acid, crevice corrosion, chloride stress-corrosion cracking and general corrosion.

When should I use an AL29-4C Stainless Steel Flex Chimney Liner ?
When there are heating appliances that are rated at 83% efficiency or higher, it is a good idea to use AL29-4C. This flue liner provides better corrosion resistance to condensed flue acids that are formed using this type of appliance.

AL29-4C
These Chimney liner kits are intended for use with HIGH EFFICIENCY GAS, OIL, and CORN burning appliances. The flue gases from these appliances are cooler and create exceptionally high amounts of moisture which in turn promotes formation of an especially corrosive acid.

Note: AL294C is the best option when burning corn. Pesticides used to grow corn have been proven to produce gases that deteriorate all types of liners. However this chimney liner will last 7 to 10 years when corn is the fuel source. We offer no warranty on any of our chimney liners when corn is used in the flue liner.

Chimney Liner Kits Include:

• Heavy Duty AL294C Stainless Steel Chimney Liner
• Quick Connect, No Sag Top Plate with Quick Connect Collar
• Quick Connect rain cap with screen and wind guard
• T and T Cap (clean out) with a removable snout for easy installation OR you have the option of a liner to appliance connector vs the the T if your connecting vertically (see illustrations below for the option that best fits your needs)
• Complete how to install chimney liners Installation Instructions
• Lifetime transferable warranty when used with any fuel other than corn fueled appliances.

The top plate and rain cap are 316L SS. The Chimney flue liner and T are AL294C SS.

Click here to learn more about chimney insulation kits and thermo insulation

High temp caulk to seal the top plate chimney silicone adhesive

We offer the best protection for you and your home. Air and water tight chimney liners, seven ply seams that lock moisture and flue gases in the flexible flue liner which keeps them from leaking into the home.

Guards against corrosion - Certified Rock Flex stainless steel chimney liners protect against hostile acids which deteriorate masonry clay tile chimneys.

What About Creosote? - Our chimney flue liners do not allow creosote to leach though the liner unlike masonry, clay tile flues, or liners not made of prime stainless. Creosote can catch fire, thanks to Rock Flex this harmful creosote is minimized and contained.

Protection from Chimney Fires - Rock Flex stainless chimney liners are listed to contain chimney fires within the liner, which protects your home from house fires caused by un maintained flues which can cause severe chimney fires.

Seals Off Carbon Monoxide - When it comes to safety our flexible chimney liners will protect the structure of your home from moisture damage and the very real potential of carbon monoxide poisoning.

UL listed in the USA and CANADA - Our stainless steel flue liners and components are UL tested and listed to UL1777 standard, Underwriter Laboratories. UL is the leader and most recognized in the United States; don't settle for less.

Lifetime Transferable Warranty - The best warranty anywhere, transferable to new homeowner if you decide to sell. You're going to feel good about this purchase, plus you're adding value to your home.

Rockford carries a complete selection of chimney liner supplies. Our hearth liner kits, chimney liner insulation kits, and all chimney lining kit components are premium stainless-steel, and they are 100 percent manufactured in the USA. Buy chimney liners online at Rockford Chimney Supply and you are guaranteed to be getting the best chimney liner supply and lining system available. Our service, price, & quality is unmatched, anywhere.

Canadian customers use our US Border Depots at no cost to you.