Modular filter unit in AISI 304 stainless steel with vertical laminar flow, with uniform speed across the entire discharge section. Specially designed for hospital applications, with ceiling installation above the operating field. Central hermetic through hole for surgical light with control sockets (pressure and aerosol test). Flat structure without protrusions for effective cleaning with hospital detergents and disinfectants. Micro-perforated protective screens with non-protruding front screw fastenings, 40% air passage (vacuum on full). Rectangular air inlets with threaded inserts on both long sides, customisable as required. The module is made in a single piece up to size 2436 inclusive, but can be supplied in several parts for transport or site requirements. Absolute filters for laminar flow from the MINILAM series can be housed, both mechanically sealed (BFL-NS) and fluid sealed (gel, BFL-NSG). The use of LF14-LF15 filters allows for an ISO 4/5 air purity class to be achieved in accordance with ISO 14644-1. The filter elements are secured using quick-mount brackets with Allen key fasteners.