Used for deflections of the duct system, for example where ducts cross.
Has a joining profile type RJFP at both ends, and is stiffened by corrugations.
A special relationship is needed between the a-dimension, fall f and length l for the LBSR to retain its cross-sectional area and not restrict the air flow. For this reason, standard lengths and standard drops have been prepared.
The product is CE marked according to EN 12101-7 and used in a rectangular smoke control system - single compartment (see declaration of performance).