Re: kitchen exhaust fan
After disconnecting power to the fan, you can probably get at the damper by removing the fan motor and blades. It will be awkward at best, but probably enough access to get it cleaned up.
If the fan unit is not too heavy, you may be able to simply remove the whole works from the cabinet. Reinstalling it and lining it up to the ducting can be tricky.
The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.