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how to build a hvac trunk line

Uncategorized / November 3, 2020

Disclosure: This post contains some affiliate links for your convenience, click here to read my full disclosure policy. There could be a couple of reason why you need to install a trunk line for HVAC. Cut two pieces of duct board 6 inches longer and wider than the inside opening of the plenum. The company that we used supplied all the metal pieces needed for the trunk line. In those cases, ducts have to run through attics or in some older houses, through garages or living spaces. C.L. The word trunk often conjures up images of big things carrying lots of stuff: Car trunks crammed with suitcases, travel trunks packed with clothes, elephant trunks full of water. Get video instructions about kitchens, bathrooms, remodeling, flooring, painting and more. The way you save money is by installing it (putting it together). A radiant-heat floor can save homeowners up to 25 percent in energy bills. Extend each mark with the T-square. Remove the 1- 1/2-inch piece of cut insulation. Use plastic cable ties to secure the ducting. Note: Use a power nut driver to drive self-tapping sheet metal screws. Take the measurement from about 1" inside the takeoff to about 1" into the boot collar. Expert Note: If you had no return air in your room, you would create a positive pressure. We are no longer supporting IE (Internet Explorer) as we strive to provide site experiences for browsers that support new web standards and security practices. Nail a piece of sheet metal onto the back of a stud cavity. Nail two end rails to the side 2-by-2s first, to form a long rectangle. Here is what we were working with…. Hammer the ends of the metal to attach the pieces together, later seal with sealant. You love to DIY. Improve your home's comfort and efficiency with a unit that allows multiple settings. Since retiring he has written freelance stories and a weekly computer security column. Rease served a four year apprenticeship to become a union sheet metal journeyman and earned a construction management degree from Florida State University. Use the crimpers if you have to cut the pipe. How to Frame a Closet With a Sloped Ceiling, How to Drywall Around Air Conditioning Ducts, Family Handyman: How to Finish a Basement, Learn Basement Renovations: Framing Air Ducts, Chief Architect: How to Create a Tray or Coffered Ceiling, How to Make an Attic Ladder Insulation Box. Because it could save you thousands! Fold the foil flap over and staple the flap to the duct board. During cold weather, gas burners create heat in the heat exchanger (Image 2), which in turn heats the air. Because it could save you thousands! Add a couple of support brackets to help support the weight of the duct. Our attic is a small area to work, Pro’s took several days to complete job. A trunk line must be sized properly for greatest efficiency—a calculation best left to the pros. Cut the duct to length with a round duct cutter. Remove the notched insulation from each groove. By providing your email address and name, you will receive our newsletter plus you will receive the FREE 3 things to do before starting a home project PDF!! Slit the foil vapor barrier extending beyond the edges of the duct board with a duct board knife. Copyright © 2020 TwoFeetFirst, LLC | Captivating Theme by Restored 316, SEE THE 3 THINGS YOU SHOULD DO BEFORE STARTING A PROJECT. So we added a new furnace & AC, moved both units, and removed all the old air ducts. I will be sharing another tutorial on just the ducts and I will show you the different types! Seal the connection with a length of foil tape. With our home, we were replacing all the HVAC minus some return ducts. Staple the foil to the duct board. That is why you need a cold air return (Image 1). You’ve successfully signed up! Air ducts are essential and efficient, but they can be unsightly in a finished basement or inside a house. Because this will take them very little time to fabricate the line (it comes in pieces to put together). Please use all appropriate and proper safety precautions when attempting projects. Flared Rectangular Take-off - connects to plenum to start ductwork. install a new trunk line or redo your HVAC, read this article, click here to read my full disclosure policy. Lift the finished box into place; get help to raise and hold it around the duct against the ceiling. The trunk line needs to be sized correctly for everything to work properly. Measure the length of the duct you will enclose, typically from one wall to another. We had to purchase all the takeoffs, duct pipe, and duct sealant separately. Step 3 Lay the duct board knife flat between the duct board and the foil vapor barrier with the tip of the knife pointing toward the 1-1/2-inch line… Nail the top ladder sides into every ceiling joist with framing nails. What Is the Best House Temperature for Pets? In some cases, you may even need to hire a pro to help with this kind of project, so check on that as well. Generally speaking, if the room existed when the house was completed, the furnace is probably powerful enough. Pull the tape measure along the piece of duct board. Mark the duct board. Attach the bottom of the trunk at an angle hammering into place. Set a piece of duct board on a firm surface with the foil vapor barrier sitting on the work surface. The takeoff rotates to make it easier to fit the duct into place. Secure start collars (Image 3) into both holes. The cutting bit then swivels around the center guide (Image 1), forming a perfect circle. 2. Save my name, email, and website in this browser for the next time I comment. © 2020 Discovery or its subsidiaries and affiliates. Measure the length you need for the supply duct. Properly cutting and seaming the duct board plenum will ensure minimal damage from condensation. But the most common sizes are 6″ and 7″, we are using both! This PDF is absolutely FREE to my newsletter subscribers. I hope the video will help you know how to install a trunk line for HVAC yourself. Hammer the ends of the metal to attach the pieces together, later seal with sealant. Tape the flaps down with foil tape to complete the duct board plenum. Center it between the joist and screw into place with self-tapping screws. The most common design (Trunk Line Layout) is provided in the illustration below. Slide the duct board knife along the width of the duct board. For the system to work, you have to re-circulate the air back to the furnace. It was not hard but they both needed to be adjusted for the elevation & test levels to work properly. NOTE ABOUT SUPPLIES: We purchased all our supplies from a local construction store (AC & Furnace store) so check your area to see if you can purchase from a specialty store. Fold the ends of the foil onto the outside of the duct board. I'm building a trunk line in my attic for my residential hvac system using 5' sections of various size pipe and - Answered by a verified HVAC Technician We use cookies to give you the best possible experience on our website. Place soapstone marks 3 inches in from each edge of the cut end pieces. Fasten rails with 16d framing nails and a hammer; put two nails into each rail through the top and bottom plates. You need a load calculation to make sure the furnace is large enough to supply the new room. The way you save money is by installing it (putting it together). Place the center guide in the pilot hole and start the cutting bit along the circumference of the hole. Home inspector Tim Hockenberry gives step-by-step instructions showing how to replace an old exhaust fan and install a new one. This PDF is absolutely FREE to my newsletter subscribers. We recommend our users to update the browser. I know I said you could save money doing it yourself and you can. I will be sharing another tutorial on just the ducts and I will show you the different types! Preset the cutting tool to the correct diameter. Attach the Takeoff to the Main Supply Line, How to Replace Ductwork and Install a Return Vent, How to Install a Radiant Heat System Underneath Flooring, Building Off the Grid: Cabin of No Return, Building Off the Grid: Glacier River Cabin. Reducer - usually 3 or 4 supply branches are connected to main trunk before a reducer changes duct size. They allow you to adjust the amount of air flowing into each room balancing the system. As trunk lines move further away from the furnace, they often taper in size for greater efficiency. Once you have all your supplies you can install the trunk line. Home House & Components Systems Heating & Cooling System, What’s a trunk line? Make sure the damper control is on the bottom of the duct. That would then reduce the flow of conditioned air to that space. Cut four 2-by-2-inch boards to the length required with a table saw or circular saw. The damper control indicator will show you whether the damper is open or closed. His articles have appeared in The News-Press, a local Southwest Florida newspaper and a small Southwest Florida fishing magazine. Cut two holes -- one in the stud cavity and the other one into the existing return (Image 2). Drag the knife perpendicular along the 1-1/2-inch mark. Let's get together. It was not hard but they both needed to be adjusted for the elevation & test levels to work properly. The trunk is sized incorrectly so you need to replace it, building a home, or you just want too. The word trunk often conjures up images of big things carrying lots of stuff: Car trunks crammed with suitcases, travel trunks…. TwoFeetFirst, LLC participates in various affiliate programs, including the Amazon Services LLC Associates Program, as an Amazon Associate I earn from qualifying purchases. Top Take-off - connector for round branch lines to connect to main supply trunk. Browse a full list of topics found on the site, from accessories to mudrooms to wreaths. The conditioned air then re-circulates back into the system as needed. Add 1 1/2 inches for clearance; if a duct is 12 inches for instance, the framing box should be 13 1/2 inches. Can be rectangular, square, or round. What you need to do is hire a local HVAC company to size your trunk line and build it. Manual J HVAC Design Service - ACCA Manual J, S & D Reports for HVAC Permits Quality Residential Manual J HVAC Calculations since 2005! Push the cut pieces in each open end of the plenum. I have changed my HVAC 2 times and would never attempt such a job. This is the most important step! These step-by-step instructions show how to install a radiant-heat system and tile floor. Once you have all your supplies you can install the trunk line. Align the long edge with a cut mark. Cover the finished box with drywall, nailed or screwed to the box members, or with wood paneling or other decorative siding.

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