Bridges the gap between the fan and perforated case panels in order to enable the cooler to draw in fresh air from the outside for improved cooling performance (up to 5°C and more) Modular system made from EVA foam spacers, adjustable from 5 to 45mm in 1mm increments, ideal for popular SFF cases (e.g. Dan A4-SFX, Loque Ghost S1) Compatible with NH-L9i (chromax.black), NH-L9i-17xx (chromax.black) NH-L9a, NH-L9a-AM5 (chromax.black) and NH-L9a-AM4 (chromax.black) Easy, straightforward installation procedure Trusted Noctua quality backed up by a 6-year manufacturers warranty