Earlier this summer I mentioned that I wanted to install a cooling fan for the bunk on our 19 deluxe,original thought was to use pvc pipe however with the offset due to the cabinet door was to much so I used fileable insulated duct witched turned out to be too much for the space., so I removed the insulation from the 4" flex duct.
this shot shows position of the first hole fairly in line with discharge from the A/C.
The 4"vent cap needed to be trimmed so the square fan would fit in the round hole of the vent cap.
originally my intention was to locate the vent in the bunk area closer to the wall however this was not posable so I moved the light down and located the vent in the lights original position, using the power from the lamp to run the fan .
The switch to turn and off the fan required a 3/4 hole in the bunk side and a 1' hole on the back side to allow the securement nut to go over the threads and secure it in place. Connecting the vent to the duct hose was a bit difficult but working it from side to side I was able to get it over the fan and secure it with a hose clamp
All large holes were cut using a 4" hole saw and masking the wood before a cut was made, the computer fan runs so quiet that we dont know that it is on so we are doubble checking to see that we turn it off the next version should have a lighted switch to show that it is on.
total time was about 3 hours from start to finish. The vents were gotten at our local rv store but they were special order, Fan was gotten at a computer.outlet.
this mod really help lower the temp in the loft it takes about an hour to cool off the bunk area, it also helps with the heat but the heater shuts off and on so when the unit is not running it does cool down quick ( we sleep with the vent open )