Refractory panels and prefab fireplace parts replaced in Kingswood Manor

Glass doors on a factory-built fireplace

Glass doors on a factory-built fireplace have to suit that fireplace. Section R1004.5 of the residential code says a gasketed fireplace door shall not be installed on a factory-built fireplace unless the fireplace system has been specifically tested, listed and labeled for that use under UL 127.

One maker offers its own door models for each size of fireplace. Before recommending any door repair or replacement, we identify what the listing allows, since a door that fits the opening may still be a door the fireplace was never tested with.

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

Why a prefab fireplace smokes

One maker's troubleshooting guide lists the usual reasons a fireplace smokes, including negative pressure in the house, blowers such as a range hood, wet wood, a dirty or blocked chimney and a chimney that is too short.

We work through that list in order, starting with the easy checks. Many smoking complaints end with a cleaner flue or a change in the house, and only some need parts.

• Negative pressure in the house
• A range hood or other blower running
• Wet or unseasoned wood
• A dirty or blocked chimney
• A chimney that is too short

Dents and damage in the inner flue

The stainless inner flue of a factory-built chimney carries the smoke and heat. Dents from dropped tools, crushed sections from roof work and separated joints narrow or break that path.

We note damage we can see from the firebox and the top, and replace damaged sections with the same maker's pipe. Where a stretch cannot be seen, the estimate says so plainly.

• Dents from dropped tools
• Sections crushed during roof work
• Separated joints
• Stretches that could not be seen