Insect Mesh for Flat Roof Window

[Midulster01]

 

We have a number of flat rooflights (electrically operated) in a commercial premises as per the attached image. 

 

Can anyone suggest a suitable cost effective flyscreen for a 2000x1000mm opening. We would need a product that is openable to allow access for cleaning. I have approached the rooflight supplier who was unable to offer any assistance.  If a system could be suggested to have the flyscreen installed on externally that would be ideal. 

 

Any assistance would be appreciated.