Framework order acquired for the production of container-based modular fabric filters dedicated to cement grinding. The first series is based on a single column of overlaid modules, which includes: support structure, hopper complete with the necessary gas distribution deflectors, screw conveyor or fluidized evacuation duct, filter body and plenum. The single modules will be completed in workshop including pneumatic devices and ship-to-ship, to be assembled on site with only-bolting operation.