New Kitchen extractor fan for condensation

[marcwicks]

I'm looking for advice.
I have an old 1930's kitchen, single brick outer wall two sides. It gets cold in the winter and when cooking I get condensation. I'm starting to get a damp smell in the room.

I do have an under cabinet fan heater in the room to take the chill off, and I only have a recirculating cooker hood because the cooker is against the interior wall there is nowhere to vent directly. Hence I plan to install an extractor on the opposite exterior wall.

1) Bathoorm vs. Kitchen extractors
There seem to be two types bathroom or kitchen.
The Bathroom are ~100mm dia. or Kitchen 150mm dia.
Is the main difference the amount of airflow? Do I need 150mm? I plan to get a humidisat version.

2) Do I need to be any more careful using larger core drill than 100mm? I'm nervous about drilling such a large hole in the wall.

3) Any more tips or considerations?

Thanks,

Marc

 

[foxhole]

You need a powerful extractor if you have thin cold external walls. I would not bother with a humidisat version, by the time it's triggered the walls could be dripping. If you intend to stay put consider dry lining the cold walls with thermal plasterboard.
You can fit a reducer on a 150mm fan so it expels thru a 100mm vent.