This tool is used to create a 180-degree turn on your duct end so the Drive Clip has something to grasp too. If you don't put in enough of these joints, you may find tha… Step 1. Unscrew any sheet-metal screws connecting metal duct to a boot or another section of duct. Before purchasing your material do your research. Friction is the enemy of airflow. You can then add a line of ductwork until the discharge fixture can be fitted to the outside. On the vent end, it connects to a boot, usually made of sheet metal. Pros. A duct system is a network of round or rectangular tubes—generally constructed of sheet metal, fiberglass board, or a flexible plasticand- wire composite—located within the walls, floors, and ceilings. Hunker may earn compensation through affiliate links in this story. 1. This type of ducting is best in tricky spaces where rigid ducts are just not possible to install, or used to attach non-flexible ductwork to an air supply outlet. 1. A Michigan contractor lists one more use for flex duct - moving make-up air. Connecting ducts can be an easy process if you know what you are doing. Flexible ductwork carries with it several advantages and disadvantages. Ducts are the channels through which air moves through your house to bring you heat in the winter, and cooling air in the summer. Some kinds of flexible ductwork can also be made from … Elizabeth Sobiski has been writing professionally since 2005. I have included lots of links throughout this post to make finding the right parts easier. Align two rectangular ducts with the same dimensions. Right-click the connector where you want to connect the duct, and click Draw Duct or Draw Placeholder Duct. 3. Squeeze, release and remove the crimp tool. A Drive cleat is shaped like a "C" and used when you have to duct ends together. Connecting ducts in a home is a rather simple process and can be done by anyone who educates themselves first. Installation Tips & Tricks — To cut flexible duct, use a steak knife from your kitchen drawer to cut through the outside jacket, fiberglass insulation and inner plastic core.Then cut the wire with a pair of wire cutters. Wolf Steel, flexible direct vent piping consists of an inner exhaust pipe, usually 4" or 5", and an … Speedi-Products 1.75 in. Some air return would be required too – perhaps in the door toward the main house. Attach S-cleats on two opposite raw metal edges of one duct to be attached. Both types of ductwork have specific features, pros, cons, and specifications. Step 2. Input the required CFM in the box below that. "We don't use flex duct much except for piping in make-up air," said Larry Paquette of Hutchison Mechanical Co. Inc., Macomb, Mich. "I buy a lot of 6- and 4-inch [flex duct] for make-up air. Parts are available at Lowe’s. Once you determine that your duct needs insulation, consider the type of insulation you want. Ensure proper insulation. Smooth the tape to ensure an airtight connection. If you don't want to spring for a dedicated tool, I've seen where people use needle-nosed pliers to do … Run flexible ductwork from the furnace to the intake outlet so that fresh air can come into your home. I called out the original HVAC company and they took a look and said they saw no water. Tape the seam of the duct connection with foil tape. It's always a good idea to be prepared by wearing the proper safety gear. The three screws will prevent the two ducts from moving and separating at the new seam. Hammer the extra 1 inch of drive material over each corner of the duct seam to lock the drive in place and provide a greater airtight connection. To do this, you need to be able to plan the route of your ducts in your house. Labor is also cheaper. You can pick up 100-yard roll for around $10.00 at any local hardware and less online. Recently I had another HVAC company come out and put in a new bathroom vent and they told me they believed the duct work was full of water. Move the tool along the duct opening and repeat the squeeze-and-release procedure until you have created the crimped duct end. The foil tape is actually an adhesive strip of thin aluminum so it will not break down over time. A main duct runs through its closet. Types of duct insulation. Napoleon's Freedom Flex venting can simplify gas fireplace installations and reduce costs compared to rigid venting systems. When you use flexible ductwork instead of metal ducts, you will save some substantial money. In these cases, a tool called a "hand brake" is very useful to the do-it-yourselfer. When I'm checking out the long runs of ducts, I look for places where the foil insulation wrap has foil tape all the way around. It is constructed of heavy-duty, fire resistant, 4-ply aluminum foil laminate that encapsulates a high … You also may want to check with your insurance company. How to Connect Duct Work. secure start collars into … If a house already has ductwork for a heating or cooling system, it’s possible to reduce HRV/ERV installation costs by installing a system without dedicated ductwork. Cut the flex duct to the... 2. Although individual pieces of ductwork seem light once a system is put together it can way hundreds of pounds. Slip the drives onto the two remaining sides of the duct work, one at a time. The wrong step could leave your home without a properly functioning air conditioner or heater. The duct work is made of pieces of sheet metal that are either round or rectangular. Select duct pieces for the connection that have crimped and uncrimped ends. Roll back the plastic or foil jacket and the fiberglass lining approximately 8 to 12 inches from the inner core. If one end is not crimped, you must crimp it by using the crimp tool, which looks like a pair of scissors. Both types of ductwork have specific features, pros, cons, and specifications. install cold air return. This can create both noise and inefficiencies. A run of duct has the job of moving the air between the air handler and the vent. It's a cheaper product. We have talked about ducts being a channel from your HVAC system throughout your home. Flexible ductwork is a very popular because it is easy to install, and has great insulation potential.Flexible ductwork is often made from flexible metals such as tin or aluminum, also metal fiberglass, or plastic. Some insurance companies will void home insurance for that kind of work done on the house. https://www.energyvanguard.com/blog/57709/How-to-Install-Flex-Duct-Properly Seal all the connections. x 100 ft. Galvanized Metal Duct Hanger Strap (2) Model# AC-MDS 1.5 ... Get $5 off when you sign up for emails with savings and tips. Place the sheet metal in between the two blades of the crimp tool, with the tool pointing into the duct. Does Ductwork Go Bad? By following these few simple instructions you will save yourself from a lot of heartache later on down the road. That piece should slide right into the uncrimped piece, giving you a secure connection to tape. Pull the duct from the boots and set it aside to either be thrown away or recycled. Simplified systems are expensive to run. If your supplier doesn’t carry draw band connectors, make your own by cutting a piece of pipe to overlap the ends, and then screw and tape the band into place. Flexible, also known as flex ducts, can be easily molded to fit a variety of positions. Plenum Systems Using Flexible Duct – Constrains Box Width to 2-3x Entrance Width – Constrains Box Length to 2 x Box Width – Flat Pressure Loss = 0.05 in. As you would expect, rigid ducts are created in a fixed position, usually made of metal, and can’t be bent or curved without damaging it. Duct tape can be used as well, but the heat will eventually wear duct tape down and make it brittle. Unlike rigid ducts, which are cut … Now, there are two major types of air ducts that you can choose depending on what you want and need. This process provides a mixing of the air and maintains proper air pressure in the house, especially when the windows and doors are closed. Connecting Rectangular Ducts. Once you know the requirements to your ductwork, the next thing that you need to know is how you will be connecting the ducts together in your house in the best way possible. *We recommend foil tape for tight seals. 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. How to Install Insulated Flex Duct 1. In the drawing area, select a piece of mechanical equipment, duct, flex duct, or duct fitting to connect the duct to. x 300 ft. Woven Polypropylene Duct Hanger Strap (24) Model# AC-FDS 1.75 $ 28 08. Flexible: Flexible ducts are used to connect to the diffuser. The sample from above calculates out to 7-inch for flex duct size. These pieces are connected to distribute air throughout the house. These are rigid ductwork and flex ductwork. And flex duct manufacturers do a good job of providing installation information." Chapter 4 is where the meat of the manual is, the installation details, and that's the part I'll talk about here. Some states have some pretty strict laws and it's important to know what they are before you begin the process. When you weave your ducting through unconventional spaces like attics and crawl spaces you are susceptible to inadequate insulation which will result in heat loss. Raw edges on duct work are extremely sharp, so use caution when handling all sheet metal. Let’s say, you’re thinking about installing a new furnace/air conditioning system. As with all ducts the connections need to be well sealed. It was new when the AC was put in 7 years ago. Click "calculate" and you will see the size of flex duct you need for that room. Step 2 – Plan Your Ductwork. The flex duct size may be different than the hard duct that runs to that room. If necessary, use a flat-head screwdriver to slightly open the S-cleat to provide easier installation. We have a new heat-pump system, which is more powerful and efficient than the old one. Plastic-Covered Fiberglass Flex Duct . One of the main aspects of duct design is the type that will be used, either flexible or rigid. The flexible ducting connects the heating and cooling system ductwork to the air distribution. When you use flexible ductwork instead of metal ducts, you will save some substantial money. Duct strap is a made of a durable Nylon webbing and has a tinsel strength of over 400lbs. Flexible ducting is ideal when rigid ducting cannot be installed due to lack of space or due to an awkward installation. To insulate the exterior, you have a choice between sleeve-style insulation and blanket wraps, which literally wrap around the ductwork. If you are working with ductwork in your home it's important to know how to connect ductwork for maximizing efficiency. of water (50 ft of EL) – Mentions Entrance Fitting • ACCA Manual D, Residential Duct Systems (2009) – Residential Industry Standard for Sizing Ducts (if done at all) By creating an account you agree to the Hunker, HVAC for Beginners: Air Duct Installation, Energy Designed Homes: Best Practice - Duct Sealing Overview. When you are measuring the ductwork prior to installation, remember that you will need to have regular support joints fitted in order to support the flexible material. If you are installing ductwork in your home it's always so important to read the instruction manual that comes with it. Flex duct may be used for both supply air (shown above), poorly installed and crimped) and return air (shown below ) in buildings. 1/2-inch-long self-tapping sheet-metal screws, Cordless drill or screwdriver with proper bit to drive screws. This is comprised of grills and registers that are mounted in a commercial building's ceiling or walls. Another simple and inexpensive way is to attach Duct strap to it. Continue pressing the two ducts together until the gap between the ducts is minimized. If the connection is longer than that length, hard duct is used for part of the connection. Related resources:How to Clean In-Wall Dryer VentHow to Reduce DuctworkHow to Install a DiffuserHow to Use Duct SealWhat Do Diffusers Do?What Is a Fire Damper? If you are going to be installing ducts in your home it's so important to wear safety gear. We have everything, from ducting to dampers! Make sure that the drives are at least 2 inches longer than the side of the duct being attached. Use Only What You Need. Whether you are finishing a new basement or installing a new heating and cooling system, chances are you will be working with HVAC ductwork. The maximum length for flexible ducting should be no longer than 1.5 metres for axial fans, 6 metres for centrifugal fans (up to 30 l/sec) and 3 metres (from 31 l/sec to 60 l/sec). When you are trying to stick to a budget on the project, this savings can help you do so. Rigid and Flex Ductwork . Slip the two raw edges of the next duct into the S-cleats that were installed on the adjoining duct. Slip the flex duct's inner core over the plenum or collar and onto the mastic glue. Smooth the tape to prevent air leakage. Rigid and Flex Ductwork . Leave 1 inch of drive hanging over each corner of the duct seam. The length of flexible duct is limited by the Default flex length option. To attach flexible duct to a sheet metal fitting, fold back outer jacket and fiberglass insulation. Run the tool around the end of the duct so that you have multiple parallel crimps. You might even find yourself paying hundreds of dollars in extra energy bills because of all the air that isn't flowing properly. Here are procedural tips: First things first, always check with your local state to find out what the building code laws are for HVAC installation. Manufactured by Napoleon a.k.a. Usually, you can see only the outlet, which is a register covered with grillwork. Some contractors use leftover pieces of s-cleat or c-clip and shape it like a backward Z, the bottom tab of the "Z" will screw to the bottom of the ductwork and the top tab of the "Z" will screw into the joist or truss. If a piece of flex duct is coming in horizontally and the boot opens up vertically, the installer usually turns the flex duct … One end of the ductwork slips into the "top" of the s and the other slips into the bottom, effectively layering the HVAC ductwork together. These are rigid ductwork and flex ductwork. If you are going to be installing ductwork in your home be sure to read the instruction manual, check out building code laws, and wear appropriate safety gear. Attach drain tubing to the main system and run it to a drain in the floor. If you are purchasing ductwork material to install in your home it's so very important to choose a product that is going to last. Some components have multiple connectors that display stacked one above another. Insert a 1/2-inch-long self-tapping sheet-metal screw at the location where the two ducts overlap to provide a solid connection. You may find it easier to place the plenum, which is the very end of the duct entrance, usually found near the furnace or air conditioner which will use the ducts. Pull the duct from the boots and set it aside to either be thrown away or recycled. Many builders and do-it-yourselfers use flexible ductwork as an alternative to hard metal ducts. Use a draw band connector to complete the butt joint. To attach flexible duct to a sheet metal fitting, fold back outer jacket and fiberglass insulation. Fasteners for flexible, non-metallic duct are required to be installed by being sealed and then mechanically-fastened with a draw band, as specified by SMACNA in sub-section S3.33, which states, “Non-metallic flexible duct shall be secured to the sleeve or collar with a draw band. By putting your ductwork together carefully you are not only saving yourself from a lot of repairs later on down the road, but you are also making your home more efficient.

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