Furnace duct partially blocked

[Harth]

Hi, we are spending our first winter in our 2006 Montana. I wasn't too impressed with the airflow out the 3 floor vents in the main room. I went looking for blockages in the duct work and found the duct is over half blocked by tin where the duct turns 90 degrees under the stairs. Is there a reason for this or do you think it was a manufacturing mistake?
https://i.ibb.co/NNktBsz/20191201-172531.jpg (https://ibb.co/1Xp7WLx)

[chuckster57]

I would suspect it was left in there when they built the trailer. Take it out, you’ll be warmer.

[NH_Bulldog]

Air ducts are usually “balanced” to provide airflow at each register. In order to get flow from the last register in line, the duct gets smaller the further you are from the source. That theory might be giving too much credit to Keystone, so I would look into the connections at the furnace to be sure you are getting all the flow you expect. There are also “ducts” into the belly area that could be flowing too much air underneath

[rhagfo]

Air ducts are usually “balanced” to provide airflow at each register. In order to get flow from the last register in line, the duct gets smaller the further you are from the source. That theory might be giving too much credit to Keystone, so I would look into the connections at the furnace to be sure you are getting all the flow you expect. There are also “ducts” into the belly area that could be flowing too much air underneath

Well in a quality sticks and bricks, but in an RV it is one size all the way. I also found a partial blockage in the duct going to our bedroom. Some aluminum duct tape fixed the issue.

[Harth]

It's before all of the registers so I can't see any reason for it. Now the challenge is how to get in there to open it up. Thanks

[chuckster57]

Look in the basement. You might be able to remove the rear wall, and it should be easy Peasy. Normally the panels are held on by squarehead (Roberts) #2 screws.