I am not 100% sure of the grammatical structure of the highlight phrases in the following sentences

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Goldenboy25

Senior Member
Krio
I am not 100% sure of the grammatical structure of the highlight phrases in the following sentences. I need your advice.

There are two buttons on the wall, the first button is the exit button that opens the doors and the second button is the break glass unit for emergency use only. If you push in the break glass unit, the doors will stay open until they are reset. Please refrain from using the break glass unit to prevent this type of incident in the building.
 
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