Middle Atlantic Products KO-WSB3 rack accessory

Closes off knockout opening in rear door if no longer needed Middle Atlantic Products standard solid rear doors on WRK, MRK and ERK Series (pg. 35) enclosures are configurable for achieving optimal active or passive thermal management. Fan, vent and filter kits are available to install after laser knockouts are removed from door. Closes knockout panel when not needed Fits in configurable rear doors