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There is really no absolute rule to fly light positioning
Always place the fly lights where they can be easily accessible, as they do need to be serviced on a regular basis and you want this to be as easy as possible so that it can be done without consuming lots of time and creating and more frustration than necessary.
Make sure the fly light units are positioned out of the way of machinery that might have a chance to damage them. Also they should no present any threat to personnel in their placement areas. Placement is ideal to stop the flies from making into the areas that are critical for fly control, you do not want to draw more inside the area, rather capture them before they make their way inside.
It is important to protect the doors and windows, and any other access points and it may be necessary to use more than one fly trap in an area. Offsetting the fly machines slightly and also to avoid attracting more of them from the outside because they are able to see the light from windows are openings is not desirable.
Using a fly machine that has an electrical killing grid is a good option for protecting doors and especially for areas that have no chance of food contamination. You will also want to make sure it is protected from wind gust as so the flies are not swept out of the catch trays.
In critical food areas do not place a unit directly over food because it would be difficult to service, there is a risk of debris falling and contaminating the food. The desired effect is to draw the flies away from the food prep area and it would not be ideal if there is a fly control machine drawing them into the area.
It is ideal to use glue board units in areas that are for food prep, it is usually the only units that are approved. In smaller area there are smaller units that are available, also available are discreet fly glue board units for customer sensitive areas where you do not when the glue boards to be visible to customers.
In larger areas it is ideal to use larger units that have a watt of 40 inches are more. There are units that can be hung from the ceiling and are two sided lights that have 2 times the attraction. Do not place the light unit near a air handling unit.
There is no specific rule when it comes to fly light positioning but by following these restrictions will help ensure your success with your fly killer program.