Your prefab fireplace, repaired to its manual in Union Park

Why only the maker's parts go in

Manuals for factory-built fireplaces are direct about parts. One maker tells owners to use only original replacement parts, and warns that using components it did not design and test for the fireplace system may cause a fire hazard.

A panel cut from generic board, a sheet metal patch or a pipe section from another brand can look close enough. We fit the listed part for your model, or explain why none is available before discussing other options.

Standoffs and clearance spacers on the unit

Factory-built fireplaces carry standoffs and clearance spacers on their outer casing, and one maker's parts list includes both as numbered parts. They hold framing and finishes at the distance the listing was tested with.

A bent or removed spacer lets material move closer to the hot casing. When the face of the fireplace is open for repair, we check the spacers we can reach and replace damaged ones.

• Standoffs on the casing
• Clearance spacers
• Framing and finish distances

Decorative tops on metal chimneys

Decorative shrouds dress up the top of a metal chimney. Sections R1004.3 and R1005.2 of the residential code permit a shroud at the top of a factory-built chimney only if it carries a listing and label for that exact system and goes on the way its maker instructs.

An unlisted shroud can trap heat and change how the chimney drafts. If your house has one, we check for its listing, and if there is none, we explain the options for replacing it with a listed top.

Factory-built fireplaces in manufactured homes

Some factory-built fireplaces are approved for manufactured homes. One maker's manual allows installation in an aftermarket, permanently located manufactured home, forbids installation in a sleeping room of a mobile home and says the structural integrity of the home's floor, walls and ceiling or roof must be maintained.

Repairs in a manufactured home follow those limits, with the unit's manual and listing checked first. We discuss any cut into framing with you and the manual before it happens.

• Unit approved for manufactured homes
• No installation in a sleeping room
• Floor, walls and roof structure kept intact