By Ken Mason from Salt Lake City UT on May 9, 2012
I'm looking for a 15 ft stainless steel liner that is durable and can be installed in my masonry straight chimney with a chimney cap for a foot square masonry chimney top. Can your 15 foot flexible liner be cut to fit a 14 ft chimney? What kind of connections are supplied with the cap? Can the liner in the chimney be loose or does it have to be tight? Could I use stainless steel straight pipe 48 in and put the pieces together inside the masonry chimney instead of the flexible pipe?
By Collin C. - NFI Master Hearth Professional on May 9, 2012
Answer:You can most certainly cut a flexible chimney liner down to a 14 foot length if needed. Most of our liner caps have a built in band clamp design that attaches tightly over the liner, then presses down on the liner. Similarly, there is a liner boot that attaches to the base of the assembly and also clamps into place.
There is no problem with allowing the liner to hang loosely within the chimney, as long as there is not too much slack that would allow the liner to bunch up or sag.
As far as a straight length of pipe goes, there is not a good way to make the connection. We do have a product called Duraliner, which comes in rigid and flexible sections. However, this is a much heavier liner that is designed to insulate better and is more purpose built for large wood burning stoves and oil furnaces.