The 1300 Series A2 Class II biological safety cabinets are offered in 4 and 6-foot wide models. Intelligent speed control automatically reduces blower speed to 30% when the window is closed. This technology extends HEPA filter life while ensuring a sterile working environment and saves energy. Noise output has been reduced to <63 dB(A) (4 foot model). Operational, safety and service data are clearly displayed. The front window of the cabinet drops within its frame to enable full access to the upper inside window surfaces. All removable components, including the HEPA filters, can be changed from the front, minimizing filter replacement time.