Fireplace Door Installation in Los Angeles

An open fireplace draws room air up the chimney to feed the fire, and it keeps drawing as the fire burns down, when the damper still cannot be closed. That air has already been heated. Glass doors limit how much of it goes up the flue, which is where most of their value lies.

They also keep sparks and rolling embers inside the firebox, and they close off the opening visually when the fireplace is not in use. What they do not do is turn an open fireplace into an efficient heater. If heat output is what you want, a fireplace insert is the purpose-built answer.

Doors are not a substitute for a working damper, either. With the fireplace cold, it is the damper that stops air moving up the flue, and a damper that no longer closes is a damper repair question.

On a masonry fireplace, doors are sized to the opening. Older openings are rarely square, so the width and height are measured at several points, and the smallest figure decides. The doors either sit inside the opening or overlap the brick or tile face around it, and which one works depends on how flat and sound that face is.

On a factory-built fireplace, the choice is narrower. The unit was tested as a system, including its doors, and only the doors its manufacturer lists for that model should be fitted. Generic doors can make the firebox run hotter than it was approved for, which puts the framing around it at risk. The rating plate, usually inside the opening or behind the lower grille, gives the make and model to look up.

If you are not sure which kind you have, look at the firebox walls. Brick means masonry; smooth panels in a metal box usually mean factory-built. Wood fireplace repair covers the difference in more detail.

The instructions for your doors are the rule. Many masonry fireplace doors are meant to be open, with the mesh screen drawn, while a fire is burning hard, and closed as it burns down. Closing tempered glass on a roaring fire can overheat it, and tempered glass that fails does so all at once.

Gas log sets add a condition of their own. Some vented log sets must be run with the doors fully open, because closed doors trap heat around the burner. If the gas log manual says doors open, that overrides everything else here.

The glass itself is a separate question. Tempered glass and ceramic glass handle heat very differently, and fireplace glass replacement explains which is which. The Chimney Safety Institute of America homeowner resources cover safe fireplace use more broadly.

A mesh screen stops sparks and embers. It does nothing for heat loss. For a fireplace that is used now and then, and where cold-weather drafts are not a complaint, a screen can be all the opening needs.

There are three common kinds: curtain screens that hang from a rod inside the opening and slide aside along it, a mesh panel built into a glass door frame, and a freestanding screen that sits on the hearth. Curtain mesh tears, sags and loses its pull chains; rods rust; freestanding screens get knocked over.

Screen repair is usually replacing the mesh panels or the rod. Screen replacement makes more sense when the frame is bent or the mesh is torn in several places. On a factory-built unit, the screen is one of the parts that should match the listing too.

Nothing about glass doors is peculiar to Los Angeles, and it would be dishonest to invent something. What varies here is the opening. Where a house has an older masonry fireplace, the opening may be arched, out of square, or faced in tile that does not give a flat surface to fix a frame to. Where a house has a factory-built unit, the question is whether its listed doors are still available.

Either way, a photograph of the opening straight on, and the rating plate if there is one, answers most of the fit question before anyone measures.