Transition box AST 2xDN75/125, 400 mm. DN75 refers to the 75 mm outside duct diameter; the inside diameter is 63 mm.

Transition box AST Classic 2xDN75/125, 300 mm. DN75 refers to the 75 mm outside duct diameter; the inside diameter is 63 mm.

Transition box AST 3xDN75/125, 400 mm. DN75 refers to the 75 mm outside duct diameter; the inside diameter is 63 mm.

Unregulated transition box 1xDN75/125. DN75 refers to the 75 mm outside duct diameter; the inside diameter is 63 mm.

Transition box with regulator 2xDN75/125. DN75 refers to the 75 mm outside duct diameter; the inside diameter is 63 mm.

Unregulated transition box 2xDN75/125. DN75 refers to the 75 mm outside duct diameter; the inside diameter is 63 mm.

Straight transition box 2xDN75/125. DN75 refers to the 75 mm outside duct diameter; the inside diameter is 63 mm.

Linear transition box 2xDN75 (500 mm). DN75 refers to the 75 mm outside duct diameter; the inside diameter is 63 mm.