A method for privately transferring filtered air through a partition of a compartment in an aircraft cabin to equalize a pressure difference between the inside and outside the compartment via a vent assembly comprising two substantially structurally identical vent halves joining together in a locking manner through a vent opening in the partition. Each vent half comprising integrally molded rim, frame, plurality of louvers fixed within the frame, latch, keeper, guide prong, and a installation index key; plastic injection molded from high strength unreinforced polycarbonate.