Finished mine today as well. Used black ducting hose and spray painted the white duct ends mat black for a less DIY-look. I'm quite happy with the result.
And.... I did a small test in which I measured the temperature with and without the hose in place. See the end of my post for the results.
The entire setup in place.
The part that goes into the B-pillar vent
The part that blows the hot air into the poptop
The contraption when not in use and packed away
The different duct ends I considered using.
The inside of the B-pillar vent. You can see why you need to cut the duct end to fit. If you do not cut it to size, the seperator inside the vent makes it impossible for the duct end to stay in place.
The bluetooth thermometer used to measure the temperature with and without the ducting hose.
Temperature Test
I used my bluetooth thermometer to do a small test. I placed it in the middle of the upper mattress. Closed all the doors. Obviously had the poptop up. And started the heater at setting 7. I let it run for 25 minutes.
Did the same procedure a second time, but with the ducting hose in place.
The results:
Without the ducting hose the temperature rose from
3.5 degrees C to
11 degrees C in 25 minutes.
With the ducting hose in place the temperature rose from
3.5 degrees C to
16 degrees C in 25 minutes.
In my opinion that's a very significant difference.