I have a newly installed Pelpro PP130. It heats great but it does have one odd situation. After being off all day and starting it up towards the evening I get one small puff of smoke from the blower vent in front and then everything is fine. That doesn't bother me but it does my wife. I have vented it straight up thru the existing wood stove roof vent. Once started it draws and operates flawlessly. Any thoughts? Thanks