Which way does air flow through furnace? A quick check
Figuring out which way does air flow through furnace systems is a question that usually pops up at the most inconvenient time—like when you've already pulled the old, dusty filter out and realized you didn't look at which way the arrow was pointing. It's a common DIY hurdle, but don't sweat it. Getting the airflow right is pretty much the most important part of basic HVAC maintenance. If the air isn't moving the way the system intended, you're looking at higher energy bills, a less comfortable house, and potentially a very expensive repair bill down the road. ...