SPU Exhalation Filter. Single-use, 3.5″ diameter x 5.75″L. For heated exhalation compartment side of ventilator. Protects ventilator exhalation components from contamination. Provides protection for up to 15 days of continuous use. No pre-use testing required. Designed specifically for 7200 Series ventilator. UOM: EA. Packaging: EA. PURITAN-BENNETT.