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You can install a mosquito killing laser outdoors and have a large area of no mosquitos. How effective is a fan for that use case?

Given that the laser is pure vaporware, I’d say it’s infinitely more effective.

Well, you specified a large area of no mosquitos. So I imagine the laser and the box fan would have equivalent effectiveness.

I mean, one of them would at least get you fewer mosquitos - especially if run daily.