Infrared Red Scanning....
How much would it cost to scan? I believe you can rent one online, or buy
one for US$1600.
Or try using smoke? Use an incense or something similar. If there's a draft,
it should be easily detected. Another idea is to create a negative pressure
in the house (e.g. by turning on a strong exhaust fan or window fan). This
would make the draft stronger and easier to detect
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