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If you can see a gap, air will be coming through; use foam tape or something to block it up?
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This.
Light a candle, hold it up to the gap and see what happens to the flame.
ETA: Or just light a candle, its Halloween. -
How much thicker than light is wind? 10 x thicker?
People routinely use light to inspect for gaps of the order of 10μm
Let's say you have a 13m.s-1 (30mph) wind pushing on the outside of the door, generating a dynamic pressure of about 100Pa
If the gap is 2m high and 5cm deep but only 10μm wide, the flow will only be about 10cm3.s-1. In a fairly small room, that flow rate is about one air change per month.
Thrustvector
JurekB
gbj_tester
@moocher
How much thicker than light is wind? 10 x thicker? I can see a gap in my door frame, light enters, but will wind?