Huh?....what did I build today? To prevent noise escaping from the whole for the airflow, a baffle box will break up the airflow and therefore the sound of the dust collector. There is a series of staggered 90 degree bumps and a large 180 degree turn the slow the airflow and break the Soundwave. I lost zero sound isolation by cutting the door open, but gained the necessary ventilation for the return of this 5hp cyclone system. STOKED! #diy #bafflebox #air #woodworking #woodshopjourney