Rigid Metal vs Flex for HVAC Ducting


Hi everybody – this is matt Risinger in the rights of your homes. Welcome to my video blog dedicated to building science and fine craftsmanship, i’m here and a 1940’s renovation. My profit, my company, is doing this project is a 1940’s house that we’ve really taken down to the studs as they say, and we’re really redoing all the major systems in the house, and i wanted to talk to you today about the differences in hvac installations in America, in the in the kind of 40s and 50s, when duct work is really starting to come into internal houses. We did a lot of rigid metal, duct work and that fell away in the decades after that, and we’ve gone to almost all our installs in america. Now our product right here called flex duct, and so this product is moving the air in the systems.

This is basically a flexible duct. You can see it’s got a plastic liner that has a metal rib in there and if you can shoot down there in the video you can see it’s got. It’S got kind of a a rugged interior. That’S not all that smooth the nice thing about these is that they are insulated on the outside. So there’s not fiber on the in the airstream.

But what i don’t like about these ducts is: they can easily compress if you can see that in the video. But it’s real easy to shrink these down and really restrict the airflow and not get the proper CFM’s out of the system like this. It costs more money to go from this to a rigid duct estimation, that’s rigid, duct. Here’S a piece right here that has them installed, yet you see it seams together and making mastic the seams now look at the difference on the inside of that duct super smooth, great airflow and you’re going to have hard time constricting the flow air on this. So in our house we build.

We really want to do all of our trunk lines and all of our plenums in rigid metal duct, and then we use a little bit of flex in our houses. But we try and maintain less than 10 feet of flex at the very end of the run. So here’s a here’s, a typical, install right here, we’re looking up at the the 2×4 trusses right here that are that are holding up the second floor. We love trusses because if you look, there’s a square cut out right here in this truss run and that square cut out houses are rigid, metal trunk line right there. So that’s rigid metal, that’s been insulated on the outside and then you can see for the vents in this house.

We’Ve dropped from that rigid duct right here into flex duct. So this is flexible, duct right here and then here is the register. That’S going to be in the in the ceiling, and so this this run of flex is probably I don’t know, seven eight feet. Someone like that, we try to limit all our flex, drops the ten foot or less, but we really like doing all the trunk lines and all the plenums in metal. It costs a little bit more, but it’s a much much better installation, much more long-lasting, no fiber.

In the airstream you get really good air flow out of these. If you ever did need to clean your ducts, although you shouldn’t have to do that very often, it’s really easy to clean these in the future, they’re not affected by UV rays, they’re. Just it’s too much better install. It is a little more expensive. You need to specify it, not every HVAC company can’t even do it.

A lot of companies can only do it in Flex, but it makes for a much much better install. So let’s follow this. This trunk line here and I’ll show you how it works on this house, so this trunk line is running all the way across the ceiling. Here you can see we’re making a bend, so we can do some outlets in the kitchen here and, as we turn the corner, we also have a rigid duct right here and that rigid duct. I had my duct guy, exposed this this corner for me.

So we can see what we’re looking at here’s, what we’re making that connection between the rigid metal and the flexible duct right there. That last, I don’t know seven eight feet, something like that is inflexible, duct. But up until that point we’re all rigid. We’Ve been mastic sealed on all those joints so that there’s no air leakage through there. That’S a really top quality install.

We pay a little more for this, but our clients get a much much better install. You can see a little bit of what that looks like here. This is actually a hood fan same process, that’s a 10-inch duct and that one’s not being insulated because we’re blowing from the out, but that’s basically, what a really good rigid duck install should look like. So if you’re building a new house remodeling and you’re putting new ductwork and how do they recommend you find an HVAC company, that’s capable of giving you rigid metal trunk lines and rigid metal plenums you’re, going to get a much better, install and specify that you want To see 10 feet or less of flex ducts at the very end of the run, you’re going to get a great install really all those benefits like I talked about with indoor air quality and longevity and durability and, of course, air flow thanks for joining me, everybody We’Ll see you next time,

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