“Ah, summer red, I would love you, if not for the heat, and dust, Yes mosquitoes, Yes flies!” Who would not think of these Pushkin’s lines, “fighting” in a country house or cottage with pesky insects, attacking tourists through the open Windows and doors. But it’s not going to trap myself in a closed room, came specially to get some fresh air. So start experimenting with a gauze canopy or curtains.
The main object of “defense” from the omnipresent flies, of course, the front door as the most frequently opened or open permanently for ventilation. And the most effective way to protect here, as shown, — additional mesh door hung on existing door frame: the entrance is almost closed, but available for the penetration of fresh air.