I am in the process of purchasing a Regency I2400 to be installed my pre-fab fireplace. My existing chimney is a 10" double wall insulated rigid pipe rated at 1,500 degrees. My question is do I need to insulate my new stainless steel chimney liner? The person I am buying my insert from said I didn't need to but I wanted to get a second opinion. Thanks
UL 1777 SS Chimney liner inside double wall insulated chimney rated at 1500 deg.
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Liners are generally used for a 2100 degree HT type venting system.
Factory built fireplace flues do not meet these requirements. They are only tested and listed as a 1700 degrees
The UL standard for relining a flue using steel relining products, only provides a listing for these products when used in masonry chimneys.
There is not a standard for using these products in a factory built chimney system, thus installing stainless steel lining products in a factory built flue will not result in a UL listed system...
Your contractor is correct, but I wopuld still have him wrap the liner with 1/4 foil-faced insulation, held in place with wire mesh...
Your call.
Factory built fireplace flues do not meet these requirements. They are only tested and listed as a 1700 degrees
The UL standard for relining a flue using steel relining products, only provides a listing for these products when used in masonry chimneys.
There is not a standard for using these products in a factory built chimney system, thus installing stainless steel lining products in a factory built flue will not result in a UL listed system...
Your contractor is correct, but I wopuld still have him wrap the liner with 1/4 foil-faced insulation, held in place with wire mesh...
Your call.
Check with your local building inspector, fire marshall or who ever inspects these things in your area. Town to town the inspectors may have different opinions. I would insulate the liner, and I think Regency is going to say the same thing.
Well said guys.....you will need to line it with a class A 2100 degree liner...as to the UL1777....your local heating inspector should be able to clarify if that process is required in the area you live.
It does change from town to town.
It does change from town to town.
I have the same set up. I have a double wall pre-fab rated at 1700f and I ran a flex ss 2100f with zero clearance rating liner 30feet from stove to top. The stove is an enviro insert. I also have an access panel that lets me touch the outer layer in the 3 layer system and it never gets above room temp.
The liner probably does not meet UL 1777 without the insulation, so if you want it to meet the 2100 deg rating it was tested for it needs the insulation, otherwise its just a 6" hunk of metal that adds zero safty to the flue system.
Tell the dealer / vendor to read the install manual or brochure for the product before they go telling people to do stupid things.
Tell the dealer / vendor to read the install manual or brochure for the product before they go telling people to do stupid things.
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