Which way does the air flow arrow on furnace filter go?
Finding the air flow arrow on furnace filter frames can feel like a tiny scavenger hunt, especially when you're crouched in a dark utility room or a cramped crawl space. It's one of those chores that seems incredibly simple until you're actually standing there, holding the new filter, and realizing you can't remember which way the air is supposed to move. Honestly, most homeowners have been there. You pull the old, dusty filter out, forget to look at which way it was facing, and then stare at the furnace like it's a complex puzzle. ...