Set The Affinity Mask of a Windows Process. Affinity Mask is a value between 1-3 where 1 is for core 0, 2 is for core 1, 3 is for both cores (it is a bitmap) Default sets the Affinity Mask to core 0 only python process can take any valid process ID.
Put simply, a heat exchanger is a device which transfers heat from one medium to another, a Hydraulic Oil Cooler or example will remove heat from hot oil by using cold water or air. Alternatively a Swimming Pool Heat Exchanger uses hot water from a boiler or solar heated water circuit to heat the pool water.
A heat exchanger is bad if gas leaks from one side of the heat exchanger to the other. In other words if the exhaust gases from the flames are allowed to enter your home, or vise versa. Certification ensures that the heat exchanger is not leaking. In most cases you need to replace the furnace.