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The main one I’ve seen is just a box with a release valve for the liquid. Because mine is made from insulation board it will probably “leak” the liquid out anyway.
Light_EDDed-
I've not been able to work out how the big black polystyrene ones are ventilated, it all seems v much focused on being almost air-tight to hold onto the warmth. Are the pipes you mentioned going to be kind of like rungs, or straws arranged in a Kerplunk fashion? Do they need to vent to the outside or is creating airchambers within the thing enough?
Sorry for loads of questions, just sort of thinking aloud
jackbepablo
Can you have a look at the off-the-peg hotbins and just copy what they do?