The door control would not lock in the open position. A different arm can be purchased through the manufacturer that would allow it to lock when open.
Global Door Controls, Standard Streamline Commercial Grade 1 Door Closer in Duronodic with Backcheck - Size 4, #TC204-BC-DU

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- Heavy-duty aluminum construction
- Control sweep, latch and backcheck closing speeds
- Meets the performance standards Grade 1 and ANSI/BHMA A156.4
- Recommended for use on aluminum storefront, wooden or hollow metal commercial doors
- Made from aluminum alloy body
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