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What are these engine inlet devices used for?

While looking at the Boeing Chinook CH-47 for this question, I noticed the screens in front of the engines, and found similar devices in other photos:

enter image description here
Source: left -- right

  • What are these devices used for?

A recurrent question here is about protecting turbine engines against bird/FOD ingestion. It seems that a screen can be used, at least at low speed.

  • It is the case? Is it used for this purpose?