About your questions, please see here below our replies:1. The “dust collector pipe” (L083B000) can be installed at a height of +9000 under the rails of the bridge-crane. It’s recommended to foresee the route of the duct close to the axes “G” and “R” of the building (not “L” as indicated) and to avoid the movements of the bridge-crane in the crossing areas of the ducts to avoid possible collision. 2. VCS1 e VCS2 are valves which are needed for the balance of the suction circuit.PK820a ed PK820b haven’t been designed to work one per time but together. Dampers at inlet and outlet of PK-820a and PK-820b are not foreseen. The flowrate can be eventually reduced through the frequency driver.