As options to Hypervent, I have looked at "Deckadence" (marineflooring.net) which I think would be close to the same as far as air movement. Another thought was DryDeck. Both have open air movement ability, and neither are as harsh as the Hypervent.
Admitted, I have not seen either used for mattress ventilation purposes.
Harvey
SleepyC :moon

Admitted, I have not seen either used for mattress ventilation purposes.
Harvey
SleepyC :moon
