I went today to see if I could find a new furnace filter for my brother's house. I took down all the specs and drove out to Home Depot to get one. After wandering around for a while, I finally found someone who knew what was going on and they directed me to the correct aisle....which was conviniently blocked off because they were moving heavy stuff around. So I stood around looking at toilets for a good 20 minutes, until I could finally get in and look for what I needed. They didn't have it. ARGH! But the "expert" agreed with my brother -- that I could take the shop vac and clean it and re-use it. I decided I'd try it and came back to the house.....but after cleaning the filter, I'm not convinced it's obviously still dirtier than a new one. And the house is going to be sitting there for a while again. The problem is, I don't know where to go if Home Depot didn't have it. Where else is there?