by golly I think you are on the right track we have done this two times already using a stove hood but we have changed things we are using a blower fan the type that will blow air out of the attic outside and we cut a wall made a whole and practice big fan and I put a plywood would around it it is more sufficient I will take pictures later and post them your wanting it is much ventilation is possible and I do have two of these fans in my work area besides I could open up the garage door I should say shop door and ventilated more yet.