I'm gonna give you credit for knowing how to adjust the airflow...that being said, and with a blizzard outside, you're likely not going to like what I have to say...It"s defective. I've got 5 of these tanks with no issues, but I can tell you that I found, who knows where, a video on someone taking one completely apart and it being a nightmare putting back together. Take it back... As a thought, do a you-tube search on that tank...a lot of info there.