So I bought a replacement vent fan for the bathroom and am running into a couple of issues:1) the new fan box is 6” deep but there is plywood at 4” deep. I assume the other side of the plywood is insulation in the attic? Can I cut the plywood to the dimensions of the new box and just stick the box in there, 2) the old duct is 3” and there is so much insulation in the attic that it would be impossible to replace. Will using an adapter (3” to 4”) be okay? via /r/DIY https://ift.tt/2HO6pOW
