The glass doors should be closed as the fire dies down to minimize the amount of room air going up the fireplace chimney.
Gas log fireplace glass doors open or closed.
Some gas log fixtures are vented so that any dangerous gases produced during the burn will travel outside just as they move up and out of a chimney in a traditional wood burning fireplace.
All gas logs should be burned with the doors wide open even if a mfr tells you they are approved for closed doors.
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Always keep the screen mesh on your fireplace closed when using the fireplace to guard against.
If you close the doors the flames pull towards the glass where it can impinge and shatter the glass.
For example a chimney issue or cleaning issue.
It is still an open hearth fireplace which is susceptible to aerodynamics.
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Build a fire with dry seasoned firewood and kindling or fire starter bricks then close the metal mesh screen but leave the glass doors open.
Tempered glass fireplace doors should remain open when a fire is burning.
Ceramic glass doors cost 3 to 4 times as much as standard tempered glass but they are designed to withstand the high heat that fireplaces generate.
Gas fireplace logs gas fireplace screen.
How to have a fire.
First open the flue.
At chimney safety institute of america we commonly get asked about whether homeowners should leave the glass doors on their fireplace open or closed.
When burning gas logs in a wood burning fireplace the glass doors should always be fully open when the gas logs are burning.
Ceramic glass doors a masonry fireplace and do not care about any heat coming into your room then it is ok to burn a fire with your glass doors closed.
This promotes adequate air flow to the gas logs.
A fireplace uses tempered glass that is resistant to physical shock.
If your doors are open too wide you also potentially have the issue of suffocating the fire with too much oxygen.
Gas fireplaces grow in popularity every year and manufacturers offer a wide selection including gas logs and self contained fireplace units mounted to a wall.
There could be other underlying issues causing your fire to burn low.
Keep in mind the glass used with a wood stove is different from that used with a fireplace.