I'd like to add an AprilAire 600 bypass humidifier.
I plan to install the humidifier on the supply plenum, and the bypass duct on the return air. The gas vent coming off the furnace is type B.
According to manufacturer, I need to keep combustibles 2 inches from this vent
So long as I maintain the 2-inch clearance, are there any safety issues with installing the humidifier above the gas vent?