Hi Folks, First time writing here. I do enjoy reading the solutions to various problems on this site. I'd like to run a 8' length of flexible duct in the basement out to an add-on sun room. This is an older brick home in pretty good condition. The duct would run perpendicular to floor joist before angling up through rim joist. Just like some input on the project. Couple questions come to mind: I'm figuring on bracing the rim joist as it is not setting on foundation. ? Would 2 posts on opposite sides of rim joist section removed be enough brace? I'm debating whether to try register in sun room floor or on brick wall. Any input will be very appreciated. Thanks for your time. Hope I explained this well enough.