How to Hang Flex Duct in an Attic
- Hold the loose end of a roll of duct support webbing against the side of a roof joist sitting directly above the flex duct. …
- Secure the webbing to the joist by hammering a 2-inch roofing nail through the webbing and into the side of the joist with a claw hammer.
How do you secure a flexible duct to the ceiling?
Quote from the video:
Quote from Youtube video: So you have a clear shot to getting this up. And around the neck of the can. So what you're going to do then you're going to set the duct down grab a zip tie. You're going to feed it through up.
How do you hang ductwork from the ceiling?
Quote from the video:
Quote from Youtube video: We're just going to put one zip screw right in the bottom. Here one here and then we're going to fold these over.
How do you install ductwork in an attic?
Quote from the video:
Quote from Youtube video: I would put the top piece on. And then connect the next piece to it strap it up here and make over duct connections. But the roof here will actually burn you to touch.
Why duct work needs to be secured and supported properly?
If your ductwork isn’t properly sized and installed, problems will occur. Poor ductwork results in a traffic jam of air within your ductwork, causing your equipment to work harder and potentially a lower life span, as well as a reduction in your overall comfort.
What is the main problem with flex duct?
Too often, flex ducts are not installed properly, and they end up kinked, bunched up, undersized, or sagging. These issues can cause increased resistance in the duct system, resulting in too little airflow reaching a building’s heating and cooling equipment.
What standard covers flexible duct and methods of connecting and sealing flexible duct?
Underwriters Laboratories standard 181 B covers: Methods of connecting and sealing flexible duct.
What fastener is commonly used with round flexible duct?
Screws. Screws are particularly useful to secure duct boots and around the joints, in round sheet metal ducts using sleeves and fittings. For vertical connections, install screws in conjunction with draw-bands, to prevent slippage: see image above.
How far apart should hangers for metal duct be placed?
Its best to use hanger spacing of 8′ or 10′ to maximize the span between hangers and reduce the amount of time for installing hangers. As ducts get larger or spacing between hangers increases they will require a heavier gauge hanger or a thicker hanger rod.
How do you attach a flex duct to a plenum?
Quote from the video:
Quote from Youtube video: We are going to tape the inner liner of the Flex duct to the. Collar. Now we're going to seal the collar to the plenum to make sure there's no air leaks.
How do you hang ductwork?
Quote from the video:
Quote from Youtube video: And i'll put the lollipop hanger right at that mark and so when i start to hang pipe when i'm by myself i like to angle the duct down. And start from the bottom.
How do you crimp ductwork?
Quote from the video:
Quote from Youtube video: And then you can see we have a crimp. Going all the way around the outside of the pipe you can kind of straighten it out it's always best to work with gloves if at all possible.
What is the max recommended length of flexible duct?
5 ft
The ASHRAE 2009 Fundamentals Handbook (page 21.7 and 21.18) reads that “for commercial systems, flexible ducts should be… no more than 5 ft in length, full stretched.” 2. This is also included in the more recent 2013 handbook; however, the limiting length recommendation was changed to 6 feet.
Is flex duct better than hard duct?
Flex ducts are better for existing trunk-and-branch heating and cooling systems. This is because they’re more versatile and flexible. Metal ducts are more rigid due to the nature of steel, making them ideal to build an entire HVAC system.
What is the maximum allowable sag between supports for flexible duct?
1. Flexible duct shall be supported at manufacturer’s recommended intervals, but at no greater distance than four feet. Maximum permissible sag is 1/2 inch per foot of spacing between supports. A connection to rigid ducting or equipment shall be considered a support joint.
Should ductwork be off the ground?
Even though there is a few small holes in the supply duct it will probably not be enough for the area. In unconditioned spaces all metal duct should be insullated to combat condensation. With the duct being on the ground plastic or not this will still cause uneeded ware and tare.
Can you use duct tape flex duct?
You should be able to use this tape on a dryer termination flex metal duct, but please note that this tape is rated up to 210°F, so there would be a gap in temperature rating.
What kind of tape do you use for flex ducts?
Foil tape
Foil tape: A UL Listed Foil Tape should be one of your go-to tools for joining and sealing joints, connections, and seams on rigid fiberglass ductboard and flexible air duct. These robust tapes are typically constructed with a release liner and meet UL 181A-P and/or UL 181B-FX qualifications.
Is there a difference between duct tape and duck tape?
Duct tape is a noun that has also come into use as a verb, related words are duct tapes, duct taped and duct taping. Duck tape is a name brand of duct tape. The company history states that this tape was originally manufactured as a waterproof tape for the American military in WWII.
