- Utlizes dome-shaped aperture plated containing more than 1000 funnel-shaped apertures. - Exit velocity of aerosol is low (<4 m/sec) - Particle size can range between 2-3 um (MMAD), varying with exit diameter of apertures. - Can nebulize single drops as small as 15 ul of formulations containing small and large molecules, suspensions, microsuspensions, and liposomes. Vibrating mesh (VB) nebulizer (Passive)