What is the exact diameter … ?

FAQ:
What is the exact diameter of the hole needed for this item? I am replacing an old Vetus ventilator & want to make sure the hole in the deck is not too big.

The hole could be between 95 mm and 102 mm. Exact sizes are:

dsd sizes

dsd sizes

dsd sizes

Use additional rings made of plywood, wood, nylon, pvc, textolite etc on bigger holes.

dsd on a ring

dsd on a ring

dsd on a ring

ds on a ring