The Hallowell EMC Models 2002 and 2000 are electronically controlled, time-cycled, pressure limited ventilators. Electronic control-- Eliminates the substantial driving gas required to operate pneumatically controlled ventilators. Time cycled-- Insures consistently spaced breaths. The possibility of stacking breaths or auto-PEEP is eliminated by keeping the I:E ratio constant at 1:2. This means that regardless of the respiratory rate setting two-thirds of the breath will remain for expiration. The respiratory rate is adjustable from 6 - 40 breaths per minute (BPM). Volume constant-- Insures that each delivered breath will have essentially the same volume, independent of changes in patient compliance and airway resistance. The deliverable tidal volume (TV) range is from approximately 20 cc to 3,000 cc. Pressure Limited-- Provides for patient safety by limiting the maximum working pressure (MWPL) to a user adjustable pressure range of 10 - 60 cm H2O. The Model 2002, now our most popular ventilator, was introduce in the circa 2002 after numerous customer requests for a finer volume adjustment at the low end of the range. We added a finer volume control in parallel with the existing control on the Model 2000. Everything else about the Model 2002 is identical to the Model 2000.