Air flow takes the path of least resistance.... Mother nature has decided the door has less resistance to air flow than your duct work..... See other discussions (in Safety and Studio threads) about size and bends in duct work.... And the flex duct you are using for make up air is absolutely the worst thing you can use for ducting... The corrugation that make it bendable are the cause of so much static pressure it makes it difficult for air flow....
Also the intake for make up air needs to be at least 10 linear feet from your exhaust air so you do not recirculate the gasses you are trying to evacuate from your work space, this also adds to air flow problems..... Make up air duct needs to be as big as practical, and really bigger is better... IT would appear you make up air duct is 4 inch flex, and its just to small... 6 or 8 inch rigid duct with formed turns would be a lot better....
Dale
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San Francisco - A Few Toys Short of a Happy Meal
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