The front mesh bay cover provides cool air into the system while dust filters prevent dust from entering. Interactive cooling system: hot air generated from HDD is expelled through both sides. Cooling performance is maximized for HDD cooling, & the overall PC exhaust is increased. Z11 Plus supports bottom PSU installation & provides an aperture for cable management to make better use of interior space. Tube apertures are provided at the rear of the case for convenient water cooling set-up & maintenance.