Horizontal Back flap ventilation (multiple size)

I present a horizontal Back Flap for a kitchen hood, for example. I use it as a return damper for bathroom and toilet hoods when I need to ensure that air is drawn from somewhere. The model consists of several parts for ease of printing. The model also includes a grid against larger insects (wasps, hornets, etc.) The insert diameter size can be customized by changing the scale in the slicer as follows: 170mm - 100%150mm - 88.24%125mm - 73.53%120mm - 70.59%100mm - 58.82% I printed it from ASA