Reward for lost Kraken!
Join Date: Apr 2006
Thanked 132 Times in 129 Posts
Rep Power: 11
Assuming you used block ice and not cubed ice, since block ice lasts much longer. With dry ice normally it comes in layers of brown paper or envelopes made of layers of brown paper, and if you leave it that way it is safe to handle the envelopes. The cold gas diffuses out through them.
Haven't tried it in a boat box but did stick some leftover dry ice in the refridge freezer section at home once, and the compressor didn't run for three days.
But some of us have some concern about using it on a boat since it will be turning into CO2 (not CO) and that will be displacing air in the boat. I'd be somewhat concerned about ventilation, especially if there's a drain from the ice box that the cold gas can creep out through.
With adequate ventilation it should be good, and I've heard of folks using it. I just have no idea of how to *ensure* adequate ventilation. From what I've been told, CO2 poisoning won't kill you in your sleep like CO does, it is supposed to wake you up with headaches and shortness of breath, or something similarly uncomfortable but giving you a chance to get out.
With this being your summer and assuming you'll have the boat opened up and vented...probably safe enough for you.