So, super stupid question for you. I printed and assembled the new design. However, once powered on, it seems like it is not sucking any air through the chamber. The chamber is filled, per your instruction with activated charcoal under the new plastic piece. Then the air filter on top. When I do a smoke test, no smoke is drawn into the chamber with the air filter on. Remove the filter and some smoke is drawn into the chamber. On the old design, with just the air filter, it sucks like a Dyson... I also checked to make sure I had the fan orientation correct and it's sucking from the chamber and blowing out the back - hell that thing can really blow w/o restrictions, and will eat a paper towel for lunch. So what am I doing wrong?