Hart & Cooley Air Flow Meters

Overview

The HART COOLEY 11748 is a fixed-blade return air grille designed for residential and light commercial HVAC duct systems. Built from steel with a bright white finish, this Series 94A grille fits a 20 x 20 inch duct opening and delivers an effective area of 1.9 square feet. The fixed blades are set at a 35-degree deflection angle with 0.75-inch blade spacing, supporting a flow rate range of 571 to 1902 CFM. HVAC technicians and sheet metal installers use this grille as a drop-in return air termination on forced-air systems where a clean, surface-flush appearance is required. The 11748 is suited for wall or ceiling return air applications in forced-air heating and cooling systems. The duct opening dimensions are 19.25 inches wide by 19.25 inches tall. The overall face width is 21.75 inches and the overall depth is 1 inch, making it a low-profile option for tight wall cavities or shallow ceiling returns. The bright white powder finish blends with standard interior trim in residential construction and light commercial tenant improvements. Key Features Fixed-blade grate at 35-degree deflection angle for consistent return airflow direction Flow rate range of 571 to 1902 CFM to suit varying system capacities 1.9 square feet of effective open area for low-restriction return air performance Steel construction with bright white finish for durability and clean appearance 0.75-inch blade spacing provides structural rigidity while maintaining airflow Domestic manufacture — Series 94A…