Hi I'm Tim Gipson and I'm going to talk to you about how to determine air flow for a furnace filter. So the first thing we want to do is we want to go to our return air grill and we pull these two levers out and we pull it out. Now like I said this is called a return air grill and when your air conditioner is running, it is actually drawing air from the room into this area and pulling it through to your unit where it can be either heated or cooled and then it comes back out through the diffusers throughout your house. So air is in this particular case air is moving in and should be moving through your filter. Now with your filters it is very easy to determine air flow because on all your filters it will be marked with a black arrow such as this one right here that says air flow direction, right? It will either say air flow or air flow direction or something like that but what we want to do is we want to have that arrow pointed towards the flow of air so again the air is flowing from here into your return air to your unit. So we simply just line up the filter with that arrow pointed towards that direction, pop it in and reclose our clasps and that's all there is to it so remember when you are putting your filters in check the arrow and make sure the arrow is facing the wall when you put that filter in. So I'm Tim Gipson and that's how to determine air flow direction for your furnace filters.