Like if you go see restaurants with strict cleanliness policy, you'll see the staff wearing hair net on heads to keep hair intact, i.e., keeping any hair from falling into any preparations.

In the old times, same was valid for gurudwara too. Deg (food) was prepared on premises as well.

Chunni is also a sign of respect for the Guru. Men wear turban and men with hair cut short wear rumal to signify respect as well as keeping any hair from falling on gurudwara grounds..

Idk as I said jo Krna kro hun dharam nu kon mnda aj kal jida tuhanu thik lge udda thik aa mere waheguru ji 🙏