ERK-4FT SKU ERK-4FT-3626 ERK FAN TOP FITS 3PCS. 4FAN Top options accept 4-1/2 fans for active thermal management. See pg. 120 for fan and air flow specs. Please log in to see price or purchase this item Request an account Line Comment Special Price Features:Mounts three 4-1/2 fansFits WMRK, ERK (35 space and higher), ERK-KD (all heights), SCRK racksSteel construction with black finish