Nailor’s 49-240 is stocked in the most popular size of 10 x 4, commonly used for residential applications. It’s an extruded aluminum bar grille offering efficient performance and stylish design. The 5010 and 5075 are linear slot diffusers with adjustable air patterns. The 5810 is a plenum slot diffuser, typically used in lay-in type ceilings for effective air distribution.