The 25 page guide begins with a description of the classifications and characteristics of flex duct, then discusses how they're tested, listed, reported, and certified. Brush on a coating of mastic, with a paintbrush, over the taped seam for a permanent seal.Attach flexible HVAC ducts with plastic or metal duct bands or straps. The official recommendation from the ADC is that flex ducts should sag no more than 1/2" per foot of length between supports. How to Connect Duct Work. The plastic zip ties zipped tight with the tensioner seems like the way to go.When the latest (3rd) edition of Manual D was in development, there was a lot of discussion about friction rates of poorly installed flex. What is the estimated life of zip ties? In our retrofit work, we'd rather see a customer with a well design and installed duct system where flex is used appropriately, then have the homeowner keep a poorly designed and installed duct system because they can't afford the cost to replace it with sheet metal. For duct sizing, they refer you to ACCA's Manual D, for example.One interesting bit of info that many installers need to understand is that flex ducts need to have the inner liner pulled tight. You can even use three sheet metal screws behind the first rib or two of the duct, as long as you use mastic under the duct at the sheet metal connection.I've been told to avoid using metal screws with flex duct because the flex can tear easily once you create a hole. If it's not tight, the friction rate jumps significantly, and that means the air flow takes a hit. It costs more to use materials that are harder to mess up. The problem, though, is quality control, and one way to help with that is to make it a little harder to do sloppy work. If you really can't bring yourself to buy those The main reason we see so many bad installations is expense. Be sure to cut all the way around the flexible ... 2. For duct sizing, they refer you to ACCA's Manual D, for example.One interesting bit of info that many installers need to understand is that flex ducts need to have the inner liner pulled tight. A couple of years ago, I even wrote an article about whether or not The 25 page guide begins with a description of the classifications and characteristics of flex duct, then discusses how they're tested, listed, reported, and certified. Select duct pieces for the connection that have crimped and uncrimped ends. He has been published in "Woman's Day," "New Home Journal" and on many do-it-yourself websites. If you don't want to use nylon ties, you can use metal clamps. Chapter 4 is where the meat of the manual is, the installation details, and that's the part I'll talk about here.Basically, what they tell you is not to do all those things I've shown here in this blog and how to install flex ducts properly. There are times where flex duct (or sections of it) can help to reduce costs. While we prefer sheet metal, especially for trunk lines, large duct systems can be exorbitantly expensive if done in all metal. Just wrap duct tape around the seams, and it looks like you're good to go. Use flex duct supports that are ridged and at 1.5 inch (38 mm) minimum wide (no cloth hangers). 1. The ADC standards say, "Keep bends greater than or equal to one (1) duct diameter bend radius." 6. Only the Kraken himself isn't going away any time soon. I've written a lot about duct problems, especially those in flex duct because they're so abundant. Use flex duct for the straight runs and hardpipe everywhere else. Tape the seams with metal tape in a cross-tabbed arrangement.
Tighten the clamp screws with a screwdriver to secure the flexible HVAC supply line splice.Unroll the insulation jacket and pull it up and over the spliced connection, including the hose clamps, duct tape and metal duct sleeve. I've seen several in attics that have broken, due to the heat I assume, so I'm not a fan of them.Stan - We haven't seen any break, but use high quality, heavy duty ties. Hold the two ends of the flex duct insulation together and wrap duct tape around them three times to hold them in place around the spliced connection. The official recommendation from the ADC is that flex ducts should sag no more than 1/2" per foot of length between supports. Things Needed. We are also in the Pacific NW and 1) most of our duct systems are in crawl spaces, not attics, and 2)our temperatures are fairly mild. He specializes in do-it-yourself projects, household and auto maintenance and property management.
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