Middle Atlantic VFD-40 Vented Front Door for 40RU ERK and MRK Series Racks
Overview
The VFD-40 is a replacement or upgrade front door designed specifically for 40-space (40RU) Middle Atlantic rack enclosures. At 25% open vent area, it allows meaningful passive airflow through the front face of the rack — a practical choice for AV and security equipment rooms where heat buildup is a concern but active cooling isn't in the budget or layout. The door ships at 44 lbs, so plan for a two-person install. Finished in textured black powder coat, it integrates cleanly with standard Middle Atlantic rack aesthetics. The VFD-40 model number appears on the door itself and in the rack documentation for traceability.
Compatibility
The VFD-40 is engineered for Middle Atlantic's ERK (Enclosed Rack) and MRK series enclosures in the 40RU configuration. It is confirmed compatible with the ERK-40 and MRK-40SL frame series. If you are specifying a rack enclosure for a new install, verify your enclosure is a 40-space ERK or MRK variant before ordering — Middle Atlantic produces similar doors across multiple RU counts (e.g., 20RU, 25RU, 44RU) and they are not interchangeable. The 20.04 in (50.9 cm) width and 70.87 in (180 cm) height are the critical fit dimensions; cross-check these against your enclosure's door opening before install. This door does not fit WRK series enclosures — the MRK/WRK field in the spec sheet is designated SR, confirming MRK compatibility only.
Installation Notes
The VFD-40 measures 1.39 in (3.5 cm) deep, which affects clearance planning if the rack is positioned flush against a wall or in a tight alcove — confirm you have adequate front clearance for door swing before mounting. The 25% vent open area is passive only; if your equipment load requires forced airflow, pair this door with a rack cooling solution such as a top-mount fan panel. No special tooling is specified beyond standard rack installation hardware. For broader rack build planning, the rack system planning guide covers enclosure selection, airflow zoning, and cable management sequencing relevant to ERK/MRK deployments.
