Air dampers and shutters

Select 80 mm 0 12 100 mm 1 12 125 mm 2 12 140 mm 3 12 150 mm 4 12 160 mm 5 12 200 mm 6 12 250 mm 7 12 315 mm 8 12 355 mm 9 12 400 mm 10 12 450 mm 11 12

for rectangular air ducts for round air ducts