Middle Atlantic KO-FILTER3 Rack Enclosure Filter Kit
Overview
The KO-FILTER3 is a passive filter kit designed for Middle Atlantic's 5.25-inch LKO rear door rack enclosures. It drops into the existing opening to add particulate filtration — a practical measure in dusty environments like building mechanical rooms, warehouse ceilings, or above-tile plenum spaces where airborne debris can shorten equipment life. No fans, no wiring: the KO-FILTER3 is entirely passive, relying on the enclosure's existing airflow path. At 19 inches wide and 1.1 inches deep, it occupies minimal rack space while covering the full standard 19-inch rackmount width.
Compatibility
The KO-FILTER3 is designed specifically for Middle Atlantic's Middle Atlantic LKO series rear door enclosures sized at 5.25 inches (3U) in height. Confirm your enclosure model carries the LKO designation and the 5.25-inch opening before ordering — this kit is not a universal filter and will not fit LKO doors of a different height (e.g. 3.5-inch or 10.5-inch variants). If you are sourcing for a rack accessory retrofit on an existing LKO installation, verify the door's filter slot dimensions match: 19 in (W) × 5.25 in (H) × 1.1 in (D). Pair with appropriate thermal management accessories if active cooling is also required for the enclosure.
Installation Notes
Installation is passive — no tools, power, or wiring required. The filter seats into the LKO rear door cutout. In high-dust environments, establish a periodic filter inspection schedule; a clogged passive filter restricts airflow and raises internal enclosure temperature, which can affect equipment reliability. Replacement frequency depends on local air quality — quarterly checks are a reasonable baseline in industrial or warehouse deployments.
