The 40 in. Deluxe Ductless Fume Hood (DCH2) offers a user-friendly control panel to help you operate, monitor, and maintain the system while protecting the user from exposure to hazardous fumes and particulate. The DCH2 features an adjustable light, variable speed fan control, and digital display with an hour counter and pressure reading. The adjustable light and variable speed fan control allow the user to easily operate and adjust the system. The digital hour counter helps the operator monitor the system by keeping to consistent maintenance schedules. The digital pressure display uses a digital magnehelic gauge to monitor the current filter’s static pressure. Once it gets to a certain pressure level, the filter will need to be changed to properly maintain the system. Approximate Airflow: up to 350 CFM. Filters Available: HEPA Filter, ASHRAE Filter, Activated Carbon, and specialty-blended.