A couple of things come to mind and this is a BC perspective but should mostly be consistent with all provinces.
The three wire circuit you describe can be fed with 2 - 1 pole breakers that of course must be placed on opposite poles to ensure the neutral current does not double.
Second and probably more to your question. It depends. Many hood fans are not wired to a jb behind the fan but to the jb forming part of the fan. If the equipment JB allows for a 3 wire in and a 2 wire out then you can do the connection in the hood fan JB. If you install a JB behind the hood fan you might be violating the accessible part in some jurisdictions depending on whether each inspection authority looks as that as accessible. The fridge outlet is likely going to be interpreted as accessible as would a range plug or dryer outlet.
From My answer the most compliant wiring path would be panel to fridge plug with 3 wire and fridge plug to hood fan with a 2 wire. 2 single pole breakers located on adjacent bus. A 2 pole breaker would not be a violation but this is not a single device with a shared neutral like a split receptacle which does require a 2 pole breaker or a tie bar across 2 single pole breakers.
