Q about Liner length

[DStydo]

Greetings from NC.

I got up on the roof last weekend to measure the chimney height and determine what liner length we need for our planned fireplace insert. Dropped a rope down the chimney and had wife hold other end level with lintel leaving a little slack in the rope. Measured almost exactly 15' from top of chimney down to lintel. I'm looking at liner (+insulation) kits that folks sell and they appear to be had in 5 foot increments. I think a 15' foot kit would be short but stepping up to a 20' is $80+ more and will result in a good amount of waste. Can I add a section of straight pipe somewhere in liner...maybe at the chimney cap?

Guess I could always try and ask online retailer if they would sell me a 16' kit

thanks in advance,

Drew

 

[DStydo]

Hmmm, didn't think this would be such an obscure question.

Ill just throw it out there that Rockford said it would be OK to put a piece of rigid off the insert and couple it to the flex that will come through my block off plate. Couplers aren't cheap though. I have also read in multiple thread where folks run rigid down chimney and adapt to flex the rest of the way to stove/insert. Best option here would prob be to get 20' of flex and 15' of insulation.

 

[bholler]

Hmmm, didn't think this would be such an obscure question.

Ill just throw it out there that Rockford said it would be OK to put a piece of rigid off the insert and couple it to the flex that will come through my block off plate. Couplers aren't cheap though. I have also read in multiple thread where folks run rigid down chimney and adapt to flex the rest of the way to stove/insert. Best option here would prob be to get 20' of flex and 15' of insulation.

If you combine rigid and flex in.most cases you no longer have a ul listed system. Just het the extra 5'

 

[EatenByLimestone]

I vote for the extra 5 feet. Liner installation often involves lots of twisting, pulling, and pushing from both ends. It may not end up as straight a shot as your rope took. It would be a bad feeling to have the liner be 6" too short.

 

[double-d]

I'd stay with the 15' kit, they are usually a little longer than the length you select. Besides you can purchase a Round Liner to Liner Quick Connector to connect 2 sections of liner if needed for about $45 and they throw in a small section of liner for free.

 

[kennyp2339]

A piece of rigid should work fine as long as you have the space in the firebox to do it, don't forget that the liner terminates into a stainless steel appliance adapter.