I am confused about changing the Pad D filter in this furnace. There are 2 sides to the pad - on side is denser and seems that it would not allow as much dust to pass through. Which side faces the inside of the furnace?
Tepierce; Welcome to the Forum... Are you sure there is no "air-flow" arrow? Normally the DENSER side will be closest to the INTAKE side of the FAN. Hube
There is an arrow pointing down that says "fan direction". This filter is a large unframed piece of filter that goes around a u-shaped metal screen which slides in and out of the furnace. One side would be closest to the fan and one side would be farthest away.
Linear Mode
