RG/RGB dampers used to adjust pressure
RG: pressure regulation in aeraulic ductwork branches.
RGP: offers finer pressure regulation than a standard damper; avoids full closure of a ductwork branch.
Core and disks made of galvanised steel
RGP: perforated disk with 46% passage, Ø 5 holes
Shafts made of Lexan M1 up to Ø 315 and of Zamak from Ø 355 to Ø 630