Middle Atlantic Products' VBK-WSA27 Vent Blocker Kit for 27.0" (68.58 cm) Deep WRK Series Stand Alone Racks is an accessory used to close improperly positioned vents. When using active thermal management, vents placed too close to an exhaust fan do more harm than good. Misplaced vents can also re-circulate hot air instead of letting it escape. Cover up badly positioned vents with included magnetic blocker strips.

By helping air flow in one direction from lower intake vents through a top fan, vent blocker strips promote strategic thermal management. Your equipment will stay cooler and run more efficiently than in a badly managed cooling system.