dougrainer wrote:
There is NOTHING in a RV rooftop AC unit that will produce debris or dust. What DOES produce this dust is, at EACH roof AC you need to make sure there is NO possible way the cavity of the roof between to top and the interior ceiling has open egress areas. If so, the AC unit will "pull" air and debris from this cavity as long as from the inside of the RV. The cavity will be behind the AC filter's, hence the fine debris. This is where AC Foil Tape comes in very handy to seal off those areas. If your AC units have the inside Plenum mount, you remove this mount and you will see the gaps on the 14 inch square roof cut out. SEAL those gaps and your problem goes away. IF top mounted AC you will have to remove the unit from the roof and do the same thing.
Thank you, Doug! I was hoping you'd see this thread, and might have seen this issue before and could offer some insight. :)
I will definitely check the cavity you mention here in the ceiling. I do recall some time ago, a mobile RV mechanic I had out doing some work on the RV, he put quite a bit of foil tape in there to try and make it more efficient.
Doug, if the AC unit is pulling this debris from that cavity....Why, would there be big piles of the dust under a vent, even days or weeks after AC unit has been off? That, is the part that really puzzles me, and has me concerned it might be critter activity of some kind. The 'piles' are only coming out of just one AC vent, also, the one over the sofa. Its one of the ones closest to the front AC unit. The rest of the vents only spew it out when AC is running.
