A double set of doors is best where adult fly populations are heavy. If doors are open constantly, use an air stream with a velocity of 1,600 feet per minute or more. Bead curtains are an alternative to screens in areas of heavy traffic. Beads should be oval with each string's beads offset from the next string so that the beads fit into each other's contours, eliminating gaps. Beads have been used in the past to brush flies off people and pets.
Place lights away from potential points of fly entry.
Remove fermenting overripe fruits from the ground. Flies may move several miles within a day or two, often originating from unsanitary sites. Rolls of sticky flypaper are available from most hardware stores. Use on back porches, garages and storage sheds where aesthetics are not of primary importance. Devices such as the Vector Fly System used indoors will capture nuisance fruit flies, house flies, etc.