Closeable outside door ve

B > I have been getting some hot engine smellls coming into my house from B > the garage. It has an exhaust vent ( probably because the hot water B > heater is gas) but no fresh air intake. I would like to add a fresh B > vent to the metal side door that I can close. B > B > A google search did not come up with anything but I do not know what B > they are called specifically. B > B > Something like a ss grill 18" by 9 " with a knob in the middle that B > allows you to slide a cover across blocking the holes would be B > perfect. B > B > Any ideas?
Use air pressure. If the house has a higher air pressure than the garage the fumes won't travel against the gradient. Possibly add an exhaust fan/power vent in the garage to lower that air pressure.
Also consider the outside breezes -- Mother Nature blowing into your garage will probably funnel into your house unless their is an easier way to exit, such as a bigger/additional vent.
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