bending flexible chimney liner?

kitand

New Member
Nov 6, 2016
25
Seattle
I'm installing a Vogelzang TR-004 wood-burning insert in my house with a standard 6" stainless flexible chimney liner (the kind with tiny ridges spiraling around the whole length). They'll be situated in my old fireplace. The liner comes into the fireplace rather vertically, and does not need ovalizing. However, the TR-004--like many inserts--has an exhaust collar pointed to the rear at roughly a 45-degree angle. Problem: the flexible liner is at a different angle, but is not flexible enough for me to hand-bend it (just near its end) to meet the insert's angle. Is it even possible to bend the flex liner, just near where it meets the insert? If so, what technique might I use to bend it? Or should I better look for an angled adapter? I searched Youtube to no avail about this problem.
 

Ctwoodtick

Minister of Fire
Jun 5, 2015
1,317
Southeast CT
Lots of good advice to be had on here and I'm sure you get one of the pros to advise you soon. Are you insulating the liner?
 
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brenndatomu

Minister of Fire
Aug 21, 2013
5,205
NE Ohio
You'll need a stainless steel elbow for that much bend...I've seen some reasonably priced ones on fleabay...
 
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bholler

Chimney sweep
Staff member
Jan 14, 2014
21,832
central pa
I'm installing a Vogelzang TR-004 wood-burning insert in my house with a standard 6" stainless flexible chimney liner (the kind with tiny ridges spiraling around the whole length). They'll be situated in my old fireplace. The liner comes into the fireplace rather vertically, and does not need ovalizing. However, the TR-004--like many inserts--has an exhaust collar pointed to the rear at roughly a 45-degree angle. Problem: the flexible liner is at a different angle, but is not flexible enough for me to hand-bend it (just near its end) to meet the insert's angle. Is it even possible to bend the flex liner, just near where it meets the insert? If so, what technique might I use to bend it? Or should I better look for an angled adapter? I searched Youtube to no avail about this problem.
Well first off you should open up the damper area so you can keep the liner round. When you do that you can probably push the liner back a little and the angle should not be as sharp. You may still need an elbow though. Make sure it is a stainless one meant for the type of liner you are using. Also be sure you insulate the liner and install a block off plate.
 
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kitand

New Member
Nov 6, 2016
25
Seattle
Ctwoodtick, yes, have insulated the liner, though not in the lower section where it comes into the fireplace.
Bholler--the liner fit through round already, just barely, but you raise a good point. If I chip away a bit of a couple strategic bricks and a bit of cast iron damper-frame, then it might have enough "play" to do the job. I'll try that first and if that doesn't work I'll order an elbow. Thanks all.
 

kitand

New Member
Nov 6, 2016
25
Seattle
Update: by widening the entry of the flexible liner (chipping some bricks and hacksawing a bit more off the damper frame, I WAS able to get an OK angle to connect with the insert. Thanks all!
 

bholler

Chimney sweep
Staff member
Jan 14, 2014
21,832
central pa
Can a flexible 6” liner turn a 90 degree corner in an 11” chimney?
No even if it could it never should. Why do you have a 90 degree corner in your chimney?
 

begreen

Mooderator
Staff member
Nov 18, 2005
83,538
South Puget Sound, WA
Could be an odd fireplace with a side outlet chimney? Our old fireplace had that.
 

begreen

Mooderator
Staff member
Nov 18, 2005
83,538
South Puget Sound, WA
It's a lousy setup for an insert and terrible to clean. I took the fireplace out completely. It was old and not in great shape, no liner in the chimney. A freestanding stove was installed in the opposite corner of the room. This has worked out very well.
 

begreen

Mooderator
Staff member
Nov 18, 2005
83,538
South Puget Sound, WA
Chimney is integral with the brick exterior of the House. Would class A chimney with an elbow be a better idea?
Do you mean a new chimney at a different location for a freestanding stove? That can work.
 

bholler

Chimney sweep
Staff member
Jan 14, 2014
21,832
central pa
Inserting class a chimney in current masonry chimney instead of flexible liner.
No that won't work the only option is probably a tee on a flexible liner