Direct vent chimney liner

[DRae]

I bought a gas insert to put into my wood burning fireplace where there was previously a gas insert.
There is an existing non-insulated chimney liner of 4 inch but my new gas insert recommends a 3 inch chimney liner. Is this a must?
Is there a way to install it without replacing the chimney liner?

 

[bholler]

I bought a gas insert to put into my wood burning fireplace where there was previously a gas insert.
There is an existing non-insulated chimney liner of 4 inch but my new gas insert recommends a 3 inch chimney liner. Is this a must?
Is there a way to install it without replacing the chimney liner?

Ask the insert manufacturer

 

[DRae]

Ask the insert manufacturer

Thanks, I'm looking at using a chimney liner increaser, but I'll check with the manufacturer as well.