Bag filter for wood dusts and shavings. The CORAL MEC mod. substation is the modular sleeve type with automatic continuous discharge, for filtering shavings, dusts and sawdust. The structure is in strong galvanised sheet panels, bolted to each other and divided as follows: upper body, containing cleaning devices, sleeve-holder frame, filtering sleeves with diameter of 220 mm and tube plate; lower body with collection hopper and evacuation and unload systems (star valve) mounted on legs. The unit is designed to operate when pressurised: the dusty air enters the inlet pre-chamber (drawing 1), which facilitates the settling of larger shavings, or in the hopper (drawing 2), and then re-ascends inside the sleeves and escapes filtered from above: with a suitable plenum, the air can be recovered in the environment or expelled via the by-pass shutter.