I noticed late yesterday after stove on 4-5 top buttons and 6-6-1 lower buttons, fire was getting that lazy look and seemed like a few pellets weren't burning well. Earlier that day 3pm ish I did notice my OAK hose was iced up inside about 2 inches in from the wall. So at 7pm I trudged out in thigh deep snow to just take a peek at my intake and exhaust. Sure enough my OAK intake was plugged with snow. I simply brushed it off with my well gloved fingers and all was well. Just letting you know it can get plugged with just a few snow flakes even with a protection cover. Watch for lazy flame. Didn't sleep most of the night because I was worried about it.