Abstract: A vacuum shield assembly and related vacuum system intended for attachment to an existing medical mask for oxygen delivery, air suction, nebulization, BIPAP, and/or CPAP. The vacuum shield assembly generally comprises a shield body and a retaining assembly. The retaining assembly may attach the vacuum shield assembly to a vacuum tube of the existing mask, which may be connected to a negative pressure vacuum system. The retaining assembly may also be attached to a nebulizer unit or component thereof, or to an oxygen supply tube of a BIPAP or CPAP mask, or a mask configured for oxygen delivery. The shield body may comprise a lower segment, which may comprise a connecting component configured and dimensioned for attachment to, and for a fluid communication, with the retaining assembly. The shield body may be configured and dimensioned to correspond to the geometry of the existing mask.