Fan into WC. Vent(s?) into larder. High/low position?

[Safety First]

I have a small WC and larder as part of a shonky lean-to inherited extension. In larder is washing machine. Not ideal I know...larder is a bit moist! Both doors are ledge and brace with big gaps at bottom. With kitchen door and back door shut you can think of the WC and larder as sealed off, but together in a block.

Aim is; WC less smelly than now, larder becomes drier than is now.

If you were putting an extractor fan into WC just at ceiling height, how would you vent the larder? One or two vents and at high/ low position?
I can send smelly WC air out the top of the wc and it could be drawn in under the door, pulling from the larder, again coming out under the door. But do I need to vent the larder with two holes, one high and one low?
Thanks.

 

[KenGMac]

How about fitting an extractor on to an external wall in the WC?? with weighted baffles that close in a wind.

As for the larder, high and low venting into the house, any "holes" in the outside walls could be really cold in winter without any baffles to stop the wind penetration?

Ken.