What's the difference between an AC Vent Cover and a Linear Slot

Linear Slot Diffuser 5000 Series linear slot grilles Fully adjustable linear slot supplyreturn air diffuser, suitable for sidewall or ceiling mounting Available with 1 to 8 slots and a choice of two slot widths linear slot diffuser ขนาด Slim and compact HELLA is a linear slot diffuser that has a slim, compact and contemporary design that makes it suitable for installation in a wide range of

linear slot diffuser cfm chart Linear Slot Return