Air-Only NEW! Deck ventilator Buy them to fit in existing plastic or wooden dorade boxes instead of leaking mushroom and labyrinth ventilators. Complete set with cabin ring and all fitting screws: specification, assembly. Models - DS Height x Width = 2.24" x 4.88" (57mm x 124mm) Cut-out, Ø = 3.74" (95mm) Free flow area = 3.59in2 (24cm2) Packed in box: 5.91" x 5.91" x 7.09" (15cm x 15cm x 18cm) Gross weight ~ 1.1lb (0,5kg)