Ductless Duct

The question of how to get the cold air from the rooftop a/c forward to the helm area is for the moment at rest.

I had considered a second a/c unit, maybe a split, but wasn't ready to make that commitment. Then we put the R2D2 unit (portable a/c with window vent) forward but it took up too much room and wasn't very satisfying. I also entertained making a duct of some kind thru the head with a small fan to encourage the cold air forward, but that meant cutting holes and I wasn't yet ready for that.

We had used a high velocity squirrel cage fan to just blow cold air forward with good success, even in 100+° temps, so I made the installation temporarily permanent by cutting a slice out of a piece of pvc pipe and using what was left as a mount for the fan. The a/c blows cold air out at ceiling level and the squirrel cage being higher not only sucks in more cold air, but also now has a direct shot to the helm.

We eventually found a less cumbersome way to send cold air forward.