Lennox G11 Furnace - How to change filter?

[tepierce]

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?

[Hube]

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

[tepierce]

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.

[Hube]

The arrow should be installed pointing into the fan intake. Hube