Stv have produced this gotcha insect door curtain system for unwanted flying insects in and around your home or work place the stv231 is a universal 4 piece insect curtain with weighted mesh panels which take 15 minutes to fit just use the fitting bar and pads that are supplied in the fitting kit fit to the top of the doors you want to protect then if using on one opening just slightly overlap to obtain a barrier fit the mesh curtain slightly larger then the space of your door frame allowing for