Best 5-Inch Chimney Liners for Flexible Masonry Chimney Relining
The best 5-inch chimney liner depends on the measured chimney height, appliance connection, and kit components you need. The Forever Vent 30-foot kit is a strong option when you want a stainless-steel liner with a top plate, rain cap, and tee; Rockford’s 20-foot kit suits buyers who value stated installation support and a transferable warranty. Other choices include 15-, 30-, and 35-foot kits for different height requirements. Confirm the appliance and chimney specifications before choosing a liner.
| Product | Length | Standout detail |
|---|---|---|
| Forever Vent Kit | 30 feet | 316L steel; top plate, rain cap, and tee |
| Rockford Flexible Liner Kit | 20 feet | Installation instructions and stated warranty |
| Forever Vent Kit | 35 feet | Longer 316L kit with included components |
| FireSafe Flexible Liner | 15 feet | 316L liner for relining or new construction |
| FireSafe Liner Kit With Tee | 30 feet | Tee connector for horizontal hookups |
Forever Vent 5-Inch, 30-Foot Kit
This kit pairs a 30-foot, 5-inch flexible liner made from 316L stainless steel with a 13-by-13-inch top plate and integrated rain cap. The listed components also include a tee, tee cap, fasteners, and a tee connector for horizontal appliance connections. The maker describes a .006-inch liner with 7-ply seams and 10 corrugations between seams.
Best for: Buyers whose measured chimney route calls for a 30-foot liner and who want key installation components bundled. It was selected for its stainless-steel construction and detailed kit contents. Choose this if a tee connection suits your layout. The product listing does not establish that the included length or connector fits every chimney or appliance, so verify those details first.
Rockford 5-Inch, 20-Foot Liner Kit
Rockford’s flexible insert kit is 5 inches in diameter and 20 feet long, with 316 stainless-steel construction. The listing specifies do-it-yourself installation instructions, customer support before and after purchase, and a warranty described as transferable to the next homeowner. It also states that the liner is UL 1777 listed in the United States and ULCS635 listed in Canada.
Best for: Buyers who need a 20-foot length and want listed installation guidance and support information. The stated transferable warranty is a distinguishing detail. The listing cautions that flexible liners are only to be installed inside a masonry chimney; avoid this product if the installation is not inside masonry. Confirm the exact warranty terms and application requirements with the seller and a qualified professional.
Forever Vent 5-Inch, 35-Foot Kit
This longer Forever Vent option uses 316L stainless steel and includes a 13-by-13-inch top plate with integrated rain cap, tee, tee cap, fasteners, and tee connector. Its listed liner is .006 inch thick, with 7-ply seams and 10 corrugations between seams. The manufacturer describes it for wood-burning, gas, and pellet appliances, but suitability still depends on the appliance and installation specifications.
Best for: Buyers whose measured route needs more liner than a 30-foot kit provides and who want the same broadly bundled components. It was selected as the longer-length counterpart to the 30-foot option. A 35-foot liner may be unnecessary for a shorter chimney; measure the required route and confirm the appliance’s permitted liner diameter before ordering.
FireSafe 5-Inch, 15-Foot Liner
This FireSafe product is a 15-foot flexible liner made from 316L stainless steel. Its listing describes a .006-inch liner with 7-ply seams and 10 corrugations between seams, intended for relining existing chimneys or use in new construction. It does not list the same top plate, rain cap, and tee bundle described for some other kits.
Best for: Buyers who need a shorter liner and are sourcing components separately or already have a plan for the rest of the installation. It was selected to represent the shortest listed length among the stainless-steel choices. The listing’s stated length may not cover taller routes; measure before purchase and confirm what components are included.
FireSafe 5-Inch, 30-Foot Kit With Tee
This 30-foot FireSafe kit features 316L stainless steel, a .006-inch liner, and a 13-by-13-inch top plate with rain cap. Its listed kit includes a tee connector for horizontal hookups. The manufacturer describes 7-ply seams and 10 corrugations between seams and says the liner is designed to support draft and combustion performance.
Best for: Buyers seeking a 30-foot option with a tee connector for a horizontal hookup. It offers a useful comparison with the Forever Vent kit at the same nominal length. The listing does not give enough detail to establish whether every connector or accessory needed for a particular installation is included, so check the full kit contents before ordering.
Buying Guide: How to Choose a 5-Inch Chimney Liner
How long should the liner be?
Measure the actual route from the appliance connection to the chimney termination, accounting for the planned connection and installation layout. The products here range from 15 to 35 feet. Do not select length based only on the building’s height; confirm the required liner length with the appliance instructions and an experienced chimney professional.
Does 5 inches match your appliance?
A 5-inch diameter is not automatically correct for every stove, insert, furnace, fireplace, or venting system. Check the appliance documentation and applicable local requirements. A liner that does not match the appliance’s specified venting needs should not be treated as interchangeable simply because it fits inside the chimney.
Should you choose a liner or a complete kit?
A liner-only listing can suit a buyer who has separately selected compatible components. A kit may include items such as a top plate, rain cap, tee, tee cap, fasteners, or appliance connector. Compare the included parts carefully: the products in this selection do not all list identical components.
What material and installation details matter?
Several featured options specify 316 or 316L stainless steel, while the Rockford listing gives additional installation and listing information. Review the product documentation for the intended fuel and appliance, installation location, connector arrangement, and any required accessories. Flexible liners should be installed according to the manufacturer’s directions and the requirements for the specific chimney system.
Frequently Asked Questions
What is a 5-inch chimney liner used for?
A 5-inch liner provides a flue passage for a compatible appliance. The required diameter depends on the appliance instructions and installation design, so verify compatibility before buying.
Can I use a flexible liner in any chimney?
No. The Rockford listing specifically says flexible liners are only for installation inside a masonry chimney. Check each product’s instructions and have the chimney assessed for suitability.
Is a liner kit the same as a liner by itself?
No. A kit may include a liner plus components such as a top plate, rain cap, tee, or connector. Included parts vary, so review the item details for the exact product.
How do I choose between 20-, 30-, and 35-foot options?
Choose based on the measured installation route and required connection layout, not on length alone. Confirm measurements and appliance requirements before placing an order.