I've never seen a bird protection area. With a plastic curtain for tasks like controlling the cleanliness too. It has a relatively high price. And may have an effect on ventilation.
I've seen the bird protection area and access by installing plastic curtains for control over its clean it is quite high and may have an effect on ventilation issues.
I have never seen a bird protection in areas with plastic curtains for the work that you want to control it very clean, and it price is relatively high, and there may be a negative impact on the ventilation