A Level 4+ Enclosure is designed to meet custom sound pressure levels in a specific environment under full load. Uses of these packages include roof top buildings, close lot lines, strict city codes, residential areas, or hospitals. Due to the high level of sound reduction, several options are possible.  These options include site surveys, site testing, and sound testing before and after installation. These enclosures are usually site specific and very custom to the genset and environment they are used in. In some cases, an enclosure can reach 50 dBA under full load. Sound reduction fluctuates exponentially as it relates to size and cost. These enclosures can be custom built to the most extreme specifications while maintaining the necessary air flow to achieve optimum performance.  The materials used in sound attenuation are UL rated for flammability.  Standard features and accessories are similar to the weather house enclosure.