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Stainless Steel Chimney Liners
There are many different shapes and varieties of stainless steel chimney liners. They range in diameters from 3" to well over 20" and shapes from round to rectangle to oval to square.

(All chimney liners come in 3 major alloys.)

316 - The most common alloy for stainless steel chimney liners used is a 316 this type of liner is used for gas and oil appliances because it is resistant to the corrosive elements given off by these appliance 316 can also be used to vent wood coal and pellet appliances.

304 - These alloy liners are used for wood, coal, and pellet appliances/stoves because it is a less expensive alloy than 316 alloys and can be used when no corrosive gases will be vented into it.

AL294C - Very high efficiency gas appliances may require the AL29 4C alloy stainless steel chimney liner, which has the highest resistance to corrosion but is usually not required.

(Click each image for more information about that liner type)



Heavywall Flex



(Around Stainless Steel Liners)

To make this section easier to understand I will first tell you about a simple but widely unknown building code. According to NFP211 codes and standards a masonry chimney with a tile liner must have a 2'' clearance to combustibles. Meaning that there must be 2'' from the outside bricks on the chimney to combustible materials throughout the house. Most chimneys are not built following this code! By insulating a new stainless steel chimney liner you can reduce that clearance to 0'' meaning you can have wood touching the chimney by using the following insulations.

Insulation Wrap The first kind of insulation that I am going to discuss is insulation wrap. Basically it is a foil faced ceramic blanket, which is wrapped around the liner before it is installed. Once this blanket it wrapped around the liner a mesh sleeve is pulled along the outside of the insulation. This mesh sleeve keeps the insulation from ripping as it is lowered down the chimney. A 1/2 thick insulation wrap is the ideal way to insulate a stainless steel liner it keeps higher heat in the chimney and away from combustibles as well as reducing any condensation that may occur inside the chimney liner.

Poured Insulation Chimney Savers does not offer poured insulation. Read about why on our poured insulation page.