The value of outside combustion air for gas furnaces

This one is about my personal gripe about sealed combustion gas furnaces not using the outside air option.
This video is part of the heating and cooling series of training videos made to accompany my websites: www.graycoolingman.com and www.grayfurnaceman.com to pass on what I have learned in many years of service and repair. If you have suggestions or comments they are welcome.
If you are a homeowner looking to repair your own appliance, understand that the voltages can be lethal, the fuels are highly flammable and high pressures are used. Know your limits.

Видео The value of outside combustion air for gas furnaces канала grayfurnaceman