If you are looking at a furnace filter find the arrow that.
Furnace air flow direction filter.
If the filter.
The arrow should always point in the direction the air is.
If you inspect your new air filter you may see an arrow that says air flow.
So air flows from your ducts through the filter and into the furnace.
On your new air filter find the arrow that indicates the proper air flow direction.
That arrow must always face toward the furnace and away from the return duct that carries the air in need of heating or cooling.
When changing furnace filters many people wonder where the arrow of the filter should point towards.
This tends to confuse everyone more than anything else.
Forced air furnaces recirculate air through a home.
Pushing air cool or heated in and pulling spent air back in for another cycle.
The right way to insert a furnace air filter.
Turn off you hvac system while you are changing your air filter.
Which way does furnace air flow.