Refractory panels and prefab fireplace parts replaced in Moss Park

A damper stuck open or closed

A damper blade that will not open fully restricts the smoke path, and one that will not close lets cooled indoor air escape up the chimney between fires. In a factory-built unit, the fix depends on the model's own handle, blade and weight parts.

We check whether the trouble is rust, a bent part or a missing piece, then order the matching part. If the damper belongs to an assembly marked not field replaceable, we tell you before discussing other options.

Clearances between the unit and the framing

Zero clearance describes a design, and the design still has clearances. One maker's model lists minimum clearances to combustibles at the back and sides of the fireplace, to the ceiling, in front of the opening and to the outer pipe of the chimney.

Remodels sometimes push framing, backer board or trim tighter than those figures. We compare what we can see with the manual for your model and list any clearance that needs correcting.

• Back and sides of the unit
• Ceiling above it
• Floor space in front of the opening
• Outer pipe of the chimney

The storm collar on the chimney pipe

A storm collar is the band clamped around a metal chimney just above where it leaves the roof. It sheds water off the pipe and over the cone below, so rain runs onto the roof instead of down the outside of the chimney.

A collar that has slipped or lost its caulk lets water run straight down the pipe into the attic or chase. We reset or replace the collar and reseal it, then check below for water damage.

• Collar tight to the pipe
• Waterproof caulk around its perimeter
• Cone openings left open
• Attic checked below for water

What zero clearance really means

Zero clearance describes a fireplace built to sit close to wood framing, with air spaces and shields built into it. It does not mean any material can touch any part of it. Each model lists its own clearances, and those figures are part of its listing.

We read the clearances in your model's manual before any repair near the framing or the face, and we point out finishes that have crept closer than allowed.