The C4D3077BBK1 is a vented split (barn) door sized for 44U C4 Series cabinets that are 30.00 in (762 mm) wide. It is a surface-mount door with a locking swinghandle, intended for data centre, network and AV installations where a full-width single door would need more swing clearance than the aisle allows. Splitting the door into two leaves lets technicians open the cabinet in tighter rows while keeping the equipment face fully accessible.

Construction is 16-gauge steel in mild steel, finished in a textured RAL9005 black powder paint coat. The vented panel is 79% perforated open area, which supports front-to-back airflow for active equipment; the C4 Doors series notes that perforated doors on both the front and back of a cabinet are suggested for most server applications.

The assembly ships as a complete door package: a main split-door leaf and a secondary leaf, three left-hand and three right-hand 180-degree opening hinges, an H1 lock-rod assembly sized for 44U, an FH333 swing handle key lock, and two barn door stop brackets. Overall drawing dimensions are 26.37 in (670 mm) wide by 76.75 in (1949 mm) high, and the shipping weight is 48 lbs (21.77 kg).

C4D3077BBK1 is manufactured in North America, is RoHS and REACH compliant, USMCA compliant, and TAA-compliant for GSA Schedule purchases. The paint finish complies with Greenguard guidelines for indoor air quality, making the door suitable for occupied office and classroom spaces as well as equipment rooms. This door is exclusively for use with the C4 Cabinet Series.