When a and b < 800, then l = 300 mm
When a or b ≥ 800, then l = 500 mm
For connection the reducer rectangular end is provided with flanges height 30 mm.
|NORDsmoke – Rectangular smoke extraction ducts Installation instruction|
|Declaration of Performance - NORDsmoke|
|NORDsmoke rect - Rectangular smoke control ducts|
|NORDsmoke-rectangular- Certificate of Consistancy of Performance|