Autovent Automatic Transport Ventilators manufactured by Allied Healthcare Products. In this section you will find the complete selection of the AUTOVENT  Family including the models 2000, 3000 and 4000.  We also carry the replacement parts and accessories, filters,  circuits and more. Autovent 4000 Transport Ventilator for Adult and pediatric with CPAP Options  from the basic unit to the complete Ventilator with Blender and Alarms