Why is there a vent in the window AC? Should it be kept

Why is there a vent in the window AC? Should it be kept window slot vent
➡️【Mk.com】✅भारत में कैसीनो गेमिंग और मनोरंजन स्थल✅, आगामी स्लॉट मशीनों, टेबल गेम और खेल सट्टेबाजी के साथ नवीनतम और सर्वश्रेष्ठ कैसीनो। ✅  Minimum Corresponding Vent Glazing Length & Slot • Natural upward deflection • Gas regulation mesh insect grille • Ready-made and bespoke sizes • Bar Length window slot It's a trickle vent If you leave it open, it allows a bit of ventilation even when the main window is closed

window slot Window Vents · Ancillaries & Ducting · Controls · Discontinued Products · Outlet Services HD Vent is a shutter style slotvent offering high equivalent area

window poker Slot size: 390mm x 16mm EA How to retrofit or install a window vent, trickle vent to a upvc window to help with condensation