Pellet Stove Manufacturers The Window On My Pellet Stove Window Gets Dirty Within A Couple Of Hours After I Have Cleaned It.?

The window on my pellet stove window gets dirty within a couple of hours after I have cleaned it.? - pellet stove manufacturers

This pan is one years 1 Old Drolet Eco 45, that I bought before Christmas. I installed an exhaust pipe of 3 inches with a T-fitting, cleaning the stove, then a 5-foot vertical, after 2 x 90 degree horizontal elbow before placing a ventilation tube of 2 meters, ending up to 45 degrees.
Use for the first time that could have a window of at least 1 day prior to the display 4 lines of smoke in the middle of each side window vertically and horizontally. I replaced the tape seals around windows, in order to have only exacerbated the situation.
The manufacturer of the stove, which have set for assistance in connection told me that my chimney is probably the problem. He said that the air was probably escaped through the door of the oven. I told him that my attempts to close the door to better things worse.
I use premium wood pellets Valfei given as 100%, without additives or chemicals. What's happening?