measuring clay liner from below?

[rick clifford]

Any suggestions of measuring the width (narrow part) of my clay liner from the fire box. I don't have a ladder high enough to measure from above. Damper is still in place and I believe it looks like it may be 8 x 13 tile but I need a pretty accurate measurement of the i.d. to see what liner and insulation to order. I Have a line on some slightly used duravent rigid liner with 6.75 inch O.D. Thanks for any suggestions

 

[Michael6268]

Get a broom handle or something similar. Put a piece of scrap wood on the tip of it. Insert through the damper up to the flue and see if it fits. Trim accordingly until it looks like it's a good fit. Then just measure the stick. Might be a better way but that was my first thought.

 

[mellow]

Get a ladder and measure from the top, it is really the only way to do it. Also while up there tie a string to a paint can and drop it down to see if it will make it to the bottom to make sure you have no obstructions in the clay liner.

 

[bholler]

What mellow said.