Soundproofing. For data centers on property adjacent to property with existing residential use, an approved Zoning District permitting residential uses, any data center mechanical equipment located on the property, whether on a roof top, on the ground level, or elsewhere on the exterior of the property, must be screened on all four sides by an acoustical barrier. For purposes of this section, acoustical barrier is defined as an exterior solid or louvred wall containing sound-proofing materials designed to absorb noise and protect neighboring properties from noise pollution.