I usually post questions about my kitchen in CT but wanted to come here for this one:
My range hood vent duct is inside a cupboard. There is a little extra room in front of the in the duct and I keep a couple things in the cupboard. There is a gap of about an inch between the duct and the hole in the ceiling through which it travels to get to the roof. It is quite a bit colder in that cupboard than it is in the rest of the kitchen. I am tempted to try to fill the gap with spray foam. Will that work? Would something else (that an ameteur can handle) work better?