Polyaire Collars – Plate Mounted Start by Polyaire $50.26 150 - $50.26 200 - $52.32 250 - $55.00 300 - $58.50 350 - $62.21 400 - $66.13 450 - $69.22 500 - $74.98 550 - $79.10 600 - $83.64 M300 - $155.12 M350 - $156.56 M400 - $157.80 O300 - $139.26 O350 - $139.67 150 200 250 300 350 400 450 500 550 600 M300 M350 M400 O300 O350 Size 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart The Plate Mounter Start Collar is used to provide a connection for flexible duct to sheet metal ductwork.