Do infinity supply and exhaust vents have to be insulated whe using a flu as a chase

[ron3637]

I think the installation instructions require insulation. The chase is in a chimmy that runs up the side of the house about 30 feet .

[tinknocker service tech]

one other reason for insulating at least the exhaust pipe in an uncodition space

even if frezing doesnt happen the cold air is denser and harder to push
the induce may have a harder time to move that colder air up and out
and experience a nusience pressure switch lock out till it pushes the colder air out. with insulation on the pipe the air will be hust a little warmer and not as hard to remove. this is just my opinion only