It doesn't take much of a gap for a fly to get through. We had weather stripping issues around our door which let in lady bugs (much preferable to flies).
In addition to the approaches mentioned above to kill the flies, they also don't like Formula 409. It seems to take out a lot of kinds of insects; we use it for this type of application in addition to its regular purpose, but as a side-benefit it cleans while it kills!
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Now: 2019 Winnebago 2500FL w/e2 WDH;Sold: 2015 Bullet Premier 19FBPR (shown)
2012 Ford F-250 Lariat Super Duty Crew Cab (gas 6.2 L, 3.73 gear ratio 2WD, 172" WB)
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