negative pressure ?

[nortonma]

I hear a lot of people talking about negative pressure causing problems with furnaces not running correctly.
How can u tell if a house has negative pressure on it.

I also read on a prior post that is could make a limit pop on inducer motor. How is that possible.

[docholiday]

I assume your talking about 80+ furnaces. They are really natural draft, the vent pipe should be negative. if the home is negative, it can prevent the flue from venting properly and trip the over temp switches.