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

If your client is requesting for a more aesthetically pleasing design, using a linear slot diffuser grille instead of a round or a square air diffuser would be

Linear Slot Diffuser · Minimum Order Quantity: 100 Square Feet · UsageApplication: Commercial · Shape: Rectangle · Surface Finish: Powder Coated · Type: Slot

linear slot diffuser installation detail Caryaire Linear Slot Diffusers are aesthetically designed air terminals, which ensure a uniform blanket of air that adheres to the ceiling even at low flow

linear single slot diffuser 2-5 Day Shipping & Delivery Linear Slot Diffusers 1-2-3 Slot & Matching Plenums - Modern AC Vent Covers - 100% Aluminum - No Corrosion