Finding which way is air flow on furnace easily
Trying to figure out which way is air flow on furnace systems usually happens right when you're standing in a dusty basement or a cramped utility closet holding a brand-new filter. It seems like it should be obvious, right? But then you look at those little arrows on the side of the filter and suddenly you're second-guessing everything. If you put it in backward, you're not just being a bit clumsy—you're actually making your HVAC work a lot harder than it needs to. ...