Boon Docker wrote:
How do you "pressurize" the interior of your trailer?
(We have a 24 foot Class C motorhome.)
When making long built-in generator runs, we close all openings except the front roof vent where the reversible fan is. We set this fan's air direction to " AIR IN" and turn it on to it's lowest speed setting.
This fan is constantly trying to bring air in - but with little actual air flow (because everything is closed up tight) merely creates and maintains a small amount of pressure inside the rig so no fumes from the generator mounted down low on the outside of the motorhome can get in through any unwanted small crack or opening due to the slight interior pressure.
There are no generator fumes up high where the roof's intake is - and it doesn't bring much actual air in anyway because all interior outlets (except for unwanted small cracks or openinigs) are closed up. Also, with a motorhome, the cab's air system should have it's ventilation mode set to "recirculate" so no air can escape out there either.
This works like a champ to keep any and all genny fumes from entering no matter what the winds outside are doing.
We also use this same technique to keep dust out of our motorhome when traveling on dusty roads, since most dust is created down low where the tires are. This dust prevention method could also be used with a trailer if the tow vehicle's alternator is connected to the trailer's battery system while traveling ... except of course maybe more dust may fly up towards the front and top of the trailer from the rear tires of the tow vehicle.