The taper is used as transition between different duct dimensions. The larger dimensions are available with offsets as in the coded sketches.
Dimension changes have a joining profile type RJFP at both ends, and are stiffened by corrugations.
Measures e and h only need to be given for alternative 6. Negative values for e, for example, mean that e is outside side a.
The product is CE marked according to EN 12101-7 and used in a rectangular smoke control system - single compartment (see declaration of performance).