Remember this video was made about ten years ago. I would use it only once, but you can make a TON of jerky using just a few. However, you just need something to hold the meat in place, it doesn't need to be an air filter. The air filters just allow for super easy cleanup. Get creative if you don't want to use them. You can use metal cooking racks, skewers, etc., pretty much anything that will keep the meat in place while it is being dried. If you use metal racks then you will want to sandwich the meat between two racks, or use toothpicks to keep the meat in place. Skewers work well but you need to use multiple, basically forming a meat raft, then rig something to hold it in place. I've done some pretty random setups when I'm too lazy to make it to Home Depot, but not too lazy to go across the street and buy meat.
