My coworker has a woodburner in his new house in Montana. It gets pretty windy where he lives, and last night he and his wife got smoked out pretty bad. He said he had to literally duct tape every opening in the fireplace to keep the smoke from billowing out. It has a blower, and the smoke and sparks were also pouring out of the blower openings. He thought about negative pressure and opened windows, but the smoke still poured in. He said he had not had this problem the day before or previously at all. This particular fireplace insert kit has two cooling air openings that are piped through the outside wall and a b-vent style flue. There is a catalytic-type converter which sits on top of the fireplace. It sounds like the fire was not a good roaring fire because it was not drafting properly, which leads me to think the problem was wind blowing in through the flue pipe. If this is correct, is there a cap, or a fitting, that can prevent this?