1.   Also, venting a gas dryer indoors can be dangerous because the air discharge can contain a combination of potentially lethal combustion gases.

2.   Another duct is installed to expel the combustion gases.

3.   Carson said that the combustion gases that are pumped back into living space are not a problem.

4.   Cooper said the manufacturers of ventless fireplaces suggest that people using them crack a window in the room to bring in oxygen and allow combustion byproduct gases to escape.

5.   Even the most efficient burners will produce some carbon monoxide, but this usually presents no health hazard because the combustion gases are expelled outside through the exhaust system.

6.   In addition, be sure that all combustion gases are properly vented to the outside.

7.   Increasing the air flow will also keep combustion gases from being pulled back into the house.

8.   Inspect the fireplace periodically for cracks in the flue or chimney that could allow combustion gases to leak back into the house.

9.   It is completely sealed, so fresh air for the fire is drawn in through a chimney tube while combustion gases are expelled through a parallel tube.

10.   Rocket nozzles control the expansion of combustion gases and help optimize thrust to push a vehicle.