Yes it would easily fit a Coopers Fermenter, if you want to use as fermenting fridge.
I use the 20l Jerry's for fermenters, but I reckon it would leave plenty of room for the 23l open mouth fermenter.
The internal dimensions are 500 deep x 600 wide x 1000 high. The compressor hump only comes out 200. Each shelf is 410 deep.
It does have shelves on the door that can be taken off for more room, or a great spot to keep hops yeats etc
