To determine the correct size, you need to measure the inside diameter of your appliance's exhaust collar (e.g., your wood stove or furnace insert) and the inside dimensions of your existing clay flue. The liner's diameter must match or slightly exceed the appliance's exhaust hole, but it must also be small enough to fit down your existing chimney structure. If you have a rectangular flue, you may need to reshape a flexible round liner to an oval shape to ensure a proper fit.

You should always use an insulated chimney liner if you are installing it for a solid fuel appliance like a wood stove, wood-burning insert, or pellet stove. Insulation keeps the flue gases hot, which drastically reduces dangerous creosote buildup and improves the draft. It also ensures your installation meets UL-1777 safety standards. Uninsulated liners are typically only acceptable for certain gas or oil appliances where building codes permit.

A complete chimney liner kit from Fireside Chimney Supply generally includes the flexible stainless steel liner, a tee connector (or appliance adapter, depending on the kit type), a top plate to seal the top of the chimney, and a rain cap to keep moisture and animals out. We also offer kits that include the required insulation wraps or pour-down insulation mixes.

Yes, installing a chimney liner is a manageable DIY project for homeowners comfortable with heights and basic tools. Our kits are designed for straightforward installation and come with detailed instructions. However, because proper drafting and venting are critical to home safety, we highly recommend having a certified chimney sweep inspect your existing chimney before installation and after the job is complete.

When properly installed and maintained, a high-quality stainless steel chimney liner (especially 316Ti or 304L alloys) can last a lifetime. This is why our premium kits come with a lifetime warranty. To ensure longevity, you must perform annual cleanings and inspections to remove corrosive soot and creosote.

The alloy you choose depends on the fuel you burn. 304L stainless steel is designed primarily for wood-burning applications. 316L and 316Ti (Titanium infused) stainless steel liners are more corrosion-resistant and are required if you are venting coal, oil, or gas, as the exhaust from these fuels is highly acidic and will eat through standard 304L steel.