Zinc-plated clamp-mounting plate for mounting the RW45/240/400/600 motor gearboxes in truss-rail ventilation systems with TRN520S and TRN1000S rack drives. Attachment by bolt/locknut clamp-fastening to the lattice beam (lattice height ). Use chain couplings and/or weld/sleeve couplings for both ends of the tubular drive shafts between the RW motor-gearbox and TR rack drive.