Fan is to small... Minimum 500cfm... Also best to calculate fan size by measuring "face opening" of hood and calculating fan size by what opening of hood size is and what size duct you are using to move exhaust air...And nature abhors a vacuum.... As your exhaust fan draws air out of hood (over torch), it causes a slight low pressure or vacuum... Nature will try to fill that vacuum by pushing fresh air into area, thusly trying to fill low pressure and causing the clean makeup air flow you desire...
Dale
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Vendor-Artist-Studio-Teacher Registry
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San Francisco - A Few Toys Short of a Happy Meal
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