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Chances are, if everything in the house is NOT running you'll be OK, just be aware of the potential for problems. Do get a CO detector...they're cheap.
I just read about a case that happened a while ago where a family bought a house with a fire place and gas appliances. They never used the fireplace and all was fine. Parents go away for the weekend, teenage daughter stays home and has a few friends over for a sleep over. They light off the fireplace, fall asleep in front of it, parents find them all dead when they get home. The chimney draft was enough to cause a down draft on the gas appliance vent(s). When the system called for heat, it vented directly into the house. Carbon monoxide poisoning was the cause of death.
On a really tight house, 100 cubic feet per minute exhaust might do it. Better safe than sorry.
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