The Simpson DuraVent 4-inch flexible liner is the only listed product that matches the requested diameter; its stated use is relining masonry chimneys for natural gas or liquid propane. The other options are 6-inch liners or insulation for liners, so they are relevant only if your appliance and chimney specifications call for those sizes. Confirm the required diameter and fuel type before buying.
| Product | Stated size | Best suited for |
|---|---|---|
| Simpson DuraVent Flexible Relining Pipe | 4 inches × 35 feet | Gas or propane masonry chimney relining |
| Fireside FireSafe Liner | 6 inches × 15 feet | Buyers needing a 6-inch liner only |
| Fireside Basic Kit With Insulation | 6 inches × 15 feet | Buyers seeking a 6-inch insert kit with insulation |
| Fireside Basic Flexible Insert Kit | 6 inches × 15 feet | Buyers seeking a 6-inch wood-stove or fireplace kit |
| Fireside FireSafe Insulation Wrap Kit | Wrap for 3- to 6-inch liners | Buyers insulating a compatible liner |
Simpson DuraVent 4-Inch Flexible Relining Pipe
Best for: Buyers who specifically need a 4-inch flexible liner for relining a masonry chimney connected to a natural-gas or liquid-propane appliance. This is the clearest match for the requested diameter among the supplied products.
The listing identifies this as a 4-inch-diameter, 35-foot flexible pipe. Its stated application is masonry chimney relining with natural gas or liquid propane. Check that both the appliance requirements and the chimney’s measurements call for a 4-inch liner, and verify that the listed length is adequate for the installation.
Limitation: The supplied product information does not describe it as a wood-stove liner; its stated use is for natural gas or propane. Do not assume it suits another fuel or appliance type without confirming the manufacturer’s specifications.
Fireside FireSafe 6-Inch Stainless Steel Liner
Best for: Buyers whose project calls for a 6-inch liner, not a 4-inch one. The listing describes a flexible 316L stainless steel liner that measures 6 inches in diameter and 15 feet long, and identifies it as made in the USA.
This option is useful as a size comparison when reviewing the product range, but it does not meet a confirmed 4-inch requirement. Choose it only if your appliance documentation and installation plan specify 6 inches.
Limitation: Its listed diameter is 6 inches. Avoid choosing it as a substitute for a 4-inch liner based on flexibility or material alone.
Fireside Basic 6-Inch Liner Kit With Insulation
Best for: Buyers comparing a packaged 6-inch liner insert kit that includes insulation. The listed features describe an adjustable fireplace insert, stainless steel liner kit, 15-foot length, and heavy-duty construction.
This kit may be more relevant than a bare liner for a project that calls for its stated configuration. The product name specifies 6 inches, so it is not a direct fit for a 4-inch liner requirement.
Limitation: The supplied details do not identify the complete kit contents or establish suitability for every appliance. Confirm components and application before ordering.
Fireside Basic 6-Inch Flexible Insert Kit
Best for: Buyers who need a 6-inch flexible stainless steel liner kit for a wood stove or fireplace insert. The product name states that it is a 15-foot, heavy-duty kit made in the USA.
Compared with the insulated kit above, this listing is identified as a basic insert kit and does not mention insulation in its name. Its 6-inch diameter makes it a comparison option rather than a match for a 4-inch project.
Limitation: Do not select it if the appliance manual calls for a 4-inch liner. The supplied product details do not spell out all included parts.
Fireside FireSafe Liner Insulation Wrap Kit
Best for: Buyers insulating a compatible liner from 3 to 6 inches in diameter. The 25-foot kit includes a 1/4-inch insulation blanket, mesh, foil tape, and adhesive, according to the product name.
This is an accessory, not a stand-alone chimney liner. It may be relevant alongside a 4-inch liner because its stated diameter range includes 4 inches, but buyers should confirm that the insulation method suits their installation.
Limitation: The wrap does not replace the liner itself. Check the kit’s installation instructions and requirements before use.
Buying Guide: How To Choose A 4-Inch Chimney Liner
How do you confirm the right diameter?
Start with the appliance manufacturer’s installation instructions, then verify the existing flue and planned liner route. A 4-inch liner is not interchangeable with a 6-inch liner simply because both are flexible. The product specifications and the appliance requirements must agree.
Which fuel type does the liner need to serve?
Check the stated appliance fuel and the liner’s listed application. The supplied 4-inch DuraVent listing specifies natural gas or liquid propane in masonry chimneys. The provided descriptions for the Fireside 6-inch products do not establish that they serve the same fuel or application.
Do you need a liner, a kit, or insulation?
- Liner pipe: A flexible pipe for the flue path, such as the listed 4-inch DuraVent product.
- Insert kit: A package described for a fireplace or stove installation; confirm which components are included.
- Insulation wrap: An accessory applied to a compatible liner, not a substitute for liner pipe.
How should you compare length and installation details?
Measure the required route and compare it with the listed product length. The options here range from 15 to 35 feet for liners, while the insulation wrap is 25 feet long. Confirm required fittings, termination parts, and installation steps from the product documentation rather than assuming they are included.
Frequently Asked Questions
Which listed product is actually 4 inches?
The Simpson DuraVent flexible relining pipe is listed as 4 inches in diameter and 35 feet long.
Can a 6-inch liner replace a 4-inch liner?
Not by default. Use the diameter specified for the appliance and installation; confirm any proposed change with the manufacturer or a qualified chimney professional.
Is the DuraVent 4-inch liner listed for wood stoves?
The supplied details state natural-gas or liquid-propane masonry chimney relining. They do not establish suitability for wood stoves.
Is the Fireside insulation wrap itself a chimney liner?
No. It is an insulation wrap kit for liners from 3 to 6 inches in diameter, not liner pipe.