Corning closet splice housing (CSH) provides storage and protection of fiber splices in individually accessible trays. The housings are used in equipment racks or equipment cabinets, 19 in or 23 in and in the transition splice between outdoor-rated and riser/plenum rated cable at a building entrance. Pigtail splicing is accomplished when the CSH is used in conjunction with a rack mount housing. The CSH is available in 3-rack-space tall and 5-rack-space models. A sliding shelf provides access to splice trays and routing guides. The housing has top and bottom rear removable access panels for vertical pigtail entry from the CLSSC-03U or CLSSC-04U housings and lockable front and rear doors (with the optional lock kits).