A complete set of mounting and regulating accessories designed for use with rectangular ventilation grilles and diffusers in low- and medium-pressure systems. The catalog includes: connection spigots for spiral ducts (NDS), volume control dampers (GP, GA, GSN, GM, GC, GT), mesh deflectors (LO), mounting frames with a filtration option (RM, RM-F), and plenum boxes (SR/SRR). Components are available in galvanized or stainless steel