Hart Cooley 421-4x12 White Steel Floor Diffuser 4 Inches X 12 Inches Wall Opening 421 Series

Product Description

The Hart Cooley 421-4x12 is a white steel floor diffuser designed for residential and light commercial HVAC supply air applications. It fits a wall opening of 4 inches x 12 inches and has an overall face size of 5.5 inches x 13.5 inches, giving it a clean, finished look when installed in standard floor or sidewall openings. This diffuser is part of the Hart Cooley 421 Series, a long-trusted line among HVAC installers, contractors, and service technicians who need reliable, durable supply registers for forced-air systems. The all-steel construction with a heavy-gauge stamped face gives this diffuser the structural strength to handle everyday foot traffic without bending or warping. The welded construction adds long-term durability, making it a practical choice for high-use areas in homes, offices, and commercial spaces. The multi-angle fin setting allows airflow direction to be adjusted to suit the room layout, helping to distribute conditioned air more evenly. Fins are rolled for added strength and safety, reducing sharp edges during handling and installation. A foot-operated dial control lets users adjust airflow volume without bending down, which is a practical feature in floor-mounted installations. The white enamel finish blends with standard interior trim and resists chipping and fading over time. HVAC techs and installers working on new construction or retrofit projects will find this register easy to drop into standard rough openings. It is compatible with standard 4 inches x 12 inches duct boots and works with common forced-air heating and cooling systems. Whether replacing a worn register or specifying diffusers for a new build, the Hart Cooley 421-4x12 delivers consistent airflow control and a clean finished appearance.

• All-steel welded construction with heavy-gauge stamped face for durability and foot traffic resistance
• Multi-angle adjustable fins with rolled edges for safe handling and directional airflow control
• Foot-operated dial damper control for easy airflow adjustment without bending

Product Highlights

The Hart Cooley 421-4x12 floor diffuser combines rugged steel construction with practical airflow control features, making it a dependable supply register for residential and commercial HVAC installations with a 4 inches x 12 inches duct opening.

Product Information

Standard Information

• Brand: HART COOLEY
• Manufacturer Part Number: 421-4x12

Technical Specifications

• Product Type: Supply Diffuser
• Series: 421
• Overall Size: 5.5 inches x 13.5 inches
• Wall Opening Size: 4 inches x 12 inches
• Wall Opening Height: 4 inches
• Wall Opening Width: 12 inches
• Color: White
• Material: Steel
• Finish: Enamel
• Application: HVAC