I got them from a truck dealer / service outlet called Birk’s Intertruck but they are only on Vancouver Island. Any truck service place will have them. They are the air filters for big highway diesel trucks. They come in several sizes and two basic configurations. The configurations are open both ends and open one end closed the other. You are interested in something that has a flow capacity equal to your DC’s rating. That will give you about twice the capacity it actually gives you when in use. (They rate them at no load)
You want a open / closed end style and probably the largest diameter you can get. You can always adapt the inlet if you can’t get the diameter you want. It is, after all just a way to let the air out and keep the dust in. The configuration up there isn’t so important.
PM me if you need any more help.
-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fiberglass trees. http://prmdesigns.com/
