[cookinwitdiesel]

My Hideout 28RKS has very low airflow in the bedroom (bedroom is at front, furnace is at back under kitchen cabinet). The airflow drops off sequentially across the 4 vents with the one in kitchen by the furnace being the highest, and the one in the bedroom being the furthest and lowest. I am not sure there is an easy solution to this.

When you have multiple registers in a commercial design on a single path, you can see that the duct necks down after each vent to reduce the cross sectional area and maintain air pressure downstream. Pretty confident that level of attention to design is NOT present in our trailers.

Easy solution? Get a regular fan that can push hot air down towards other end of the trailer, or just take up the register nearest the furnace, tape 1/2 or 1/3 of it to block the output, and put it back in place. This effectively increases the resistance of that vent and pushes more air pressure back into the duct resulting in more air flow downstream. You can think of it like resistors in parallel in a circuit. The one with the lowest resistance will carry the highest current - but if you increase that resistance, the load will distribute across the others in the same system. It is the EXACT same physics at play here. Easy way to test this out to find the best balance for your trailer, just get a large hardcover book (like a text book from school) and place it over the vent partially blocking it. You can adjust the blocked portion until you find the right balance before doing tape or anything that is longer term. You may need to partially obscure a couple vents before you get the desired airflow in the bedroom - remember, if you make one vent higher resistance, now a new one will become the lowest and be where the most air escapes from, so you have to balance across the entire system to get the desired effect.