If you have vented gas logs then you must keep the flue open when the logs are burning. Most vented sets have a built in "stop" for the flue to prevent someone from closing it completely. If the log set gives off a nice yellow flame then its likely vented.Also question is, do you need to open the flue with a gas fireplace?
Vented gas logs The drawback: They're not efficient as a heating source. You need to leave your chimney's damper partially open to vent the carbon monoxide that the gas fire produces, so much of the heat generated by a vented gas log set goes up the chimney.
Similarly, how do you tell if the flue is open on a gas fireplace? Perform a visual check. Using a flashlight, poke your head inside the fireplace to look up into the chimney. If you have a throat damper, you can tell if it is closed if you see a barrier above your head. If you can see up into the flue, the damper is open.
Also Know, should damper be open or closed with gas logs?
The damper in a gas fireplace should remain open all the time. The glass between the firebox and your home prevents cold or heat from coming down the chimney and by leaving the damper open at all times, you eliminate the risk of having gas build up or backdraft into your home.
Will Vented gas logs heat a room?
A vented gas log must be used in a regular fireplace, designed to burn a wood fire. The Gas Log Heater will provide up to 25,000 BTU's of heat into the room and can be used with or without glass doors.
Can I leave the flue open overnight?
Leave the damper open overnight. Yes, you will lose some heat up the flue, but you will save the occupants of the home from poisoning by colorless, odorless carbon monoxide. In the morning, stir the embers and check them for any hot spots.Can you get carbon monoxide poisoning from a gas fireplace?
Yes, gas fireplaces are one potential cause of carbon monoxide poisoning. An improperly maintained or ventilated gas fireplace, however, can result in incomplete combustion, creating carbon monoxide, and causing this toxic gas to linger—putting those inside at risk of carbon monoxide poisoning.Should I leave my fireplace flue open?
Close Damper to Save Heat The damper should always be fully open before lighting a fire and when the fireplace is in use. The damper should be kept open until all embers are finished burning to prevent smoke from escaping into the home. When the fireplace is not in use, the damper should always be closed.How do you know if your gas fireplace is vented?
Turn on the fireplace. If the flames reach above the gas logs and the look like a wood burning fireplace, then the logs must be vented. If the flames are small, an have a blue cast, the fireplace is vent-free.How long can you leave your gas fireplace on?
In most cases, if your fireplace was installed properly, you can leave it on indefinitely. There is no time limit built into the safety requirements for vented gas fireplaces. Gas fireplaces literally run for days when being safety tested.Can I keep flue closed with gas fireplace?
Because gas-log fires produce copious amounts of carbon monoxide, they have to vent outside in a fail-safe manner. That's why there is, or should be, a keep-open device attached to the damper in gas-log fireplaces. Do not close a fireplace damper until the fire is completely out.Do gas fireplaces use a lot of gas?
A typical gas fireplace consumes 30k to 40k BTUs of gas per hour set on “high”, but you can look on the data tag in the bottom of your fireplace to know exactly what yours is rated for. Natural gas is normally billed per therm.Is a damper and flue the same thing?
Every Fireplace has a chimney damper. This is a movable plate that sits above the fireplace before the flue. If you pull the lever toward you, generally that will open most of the dampers. The flue, also known as the chimney lining, is basically a pipe up the middle of the chimney.How do I know if my gas logs are vent free?
If the flame is standing still or pushed out toward the room, then your fireplace is not drafting enough and you must open the damper more. Positive Features of Vented Gas Logs: Extremely realistic flame pattern that looks like a wood fire. Flame is much taller than ventless logs.What is difference between vented and unvented gas logs?
Vented gas logs burn like a real wood fire with a yellow flame that produces smoke. They must be burned in a wood burning fireplace with the damper open, so smoke goes up the flue along with most of the heat. Ventless (vent-free) gas logs burn cleanly with a lower flame that does not smoke.Can gas fireplaces run continuously?
Types of Gas Fireplaces Most fireplace inserts can be run continuously, as long as the glass front is sealed. Because vent-free gas fireplaces don't vent exhaust fumes outside the home, they should only be operated for a few hours at a time.Is vented or ventless fireplace better?
Ventless fireplaces are more energy efficient than vented fireplaces because no heat escapes up the flue, so you'll save money on gas utility bills. A vented gas fireplace uses more gas to create the same level of warmth because some of its heat escapes through the flue.Can I use ventless gas logs in a vented fireplace?
VENTED GAS LOGS: Vented gas logs can be installed in most any fireplace that is fully capable of burning wood. Vented gas logs must be burned with the damper open. VENTLESS GAS LOGS: Ventless gas logs can be installed in any fireplace that is fully capable of burning wood and are burned with the damper closed.Do gas logs need a vent?
Just like a traditional wood-burning fire, vented gas logs produce carbon monoxide emissions. For this reason, they require a chimney or flue to operate. You must remember to open the damper each time you use your unit to allow for proper venting.How do you insulate a gas fireplace?
Insulating Gas Fireplaces A built-in insulation basket is included with the fireplace around the vent. If you are venting the fireplace from the top, you need to cut out a hole for the vent from the insulation and leave it in place, but remove the entire piece for side venting.Do Vented gas logs smell?
Vented gas logs are burned in wood burning fireplaces with the damper fully open, so the smell that is produced goes up the fllue. So unless you have a poorly drafting fireplace, you will not have the odor problem described below if you install vented gas logs. Soon with the details!Can I shut the flue on my gas fireplace?
You can close the flue when you shut it off, to keep the warm house air from going up the chimney, or if you have glass doors just leave the flue open all the time and close the doors when off. 
