There is a big misconception people have over pests and the need for pest control…
It can be hard to keep flies out of large facilities with many entrances/exits and lots of employees or visitors coming and going.
Practices like propping open exterior doors for a cigarette break or leaving loading dock doors open contribute to fly problems.
When dealing with a fly problem in a food warehouse, hospital, or another sensitive commercial account, you first need to identify the flies and the source. Instituting pest-proofing measures involving exterior doors and other openings to the outside will have little effect if the flies are breeding inside the facility rather than entering from outside.
Exterior doors need to be kept closed except for quick exits or entries. Installing self-closing devices or alarms on critical doors could help ensure that they are not left open. Communicate the importance of closing doors to employees.
A change in traffic flow policies within the facility, even if only temporary, could direct employees and visitors to only use primary monitored doors while little-used secondary doors would be used only in emergencies or for special needs.
Primary entrance doors in each section of the building should be chosen to funnel incoming flies into smaller areas or corridors where they could more easily be trapped before they can disperse throughout the facility. Preferred entrances would have a double-door vestibule area or would lead into a hallway.
Insect light traps (ILTs) work best in a vestibule area to intercept flies immediately after they have entered through outside doors but before they can get through the second set of doors to move into the facility. If an entry vestibule does not exist, consider creating a short entrance hallway or foyer by installing a second set of doors inside the primary doors. A double-door vestibule can be used within a facility hallway, too, to keep flies out of critical interior areas.
Depending on the type of facility and the type of traffic, you can install air doors or air curtains over critical doorways such as service entrances to keep flying insects out. Exterior air doors can have wind speeds of more than 20 mph, though, and may not be appreciated at visitor entrances. Air doors are available in many styles with many options.