625x18mm Frameless Architectural Linear Slot Diffuser Vent Grille

Also, Slots are just openings with no louvered face Typically you can get them in single slot where there is only one opening or even up to 2,

Shop 60 Linear Slot Diffuser - Single Slot - Black Decorative Air Vent - Modern AC Vent Cover for Ceiling, Walls & Floors

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