You don't need airflow if the ice keeps the ic frozen down the track.
"Dry ice is frozen carbon dioxide. A block of dry ice has a surface temperature of -109.3 degrees F (-78.5 degrees C). "
You can light the ic on fire with dry ice on it and I don't think it would become heat soaked till the dry ice runs out.
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Learn how to use the feedback system! When people don't fallow through with a deal, fucking make it known! of course everyone has all positive points, no one fucking gives negatives for flakers, if you start giving negative feedbacks for flaking maybe people on tr will stop making stupid ass posts about wanting to buy shit then not showing up for the shit.