Rehoppe wrote:
Almost what I meant... If the fan sucks air From the Heatbox, instead of pressurizing it. A problem arises IF the combustion chamber is not sealed as the leaks will attempt to equalize the pressure into the heatbox, instead of exhausting the gases out.
Yes, both are true. The furnace is designed so that the fan sucks the combustion air out. A leak may, or may not, also cause a problem with operation of the furnace such as the pilot not lighting. Of course, if the pilot doesn't light then there is no CO generated.
If the leak was away from the pilot area, the furnace might operate as usual. Some outair would be coming in from the intake vent and some would be coming in through the leak. Due to the design the CO could not leak into the living quarters.
