They are generally two halves that pop together with little "buttons" on the edges. Otherwise you might have to take down the trunk line. Last take-off run to be located 12" - 18" from end. Installing ductwork for heating and air conditioning is a bit like putting together a huge three-dimensional jigsaw puzzle. Each piece of duct has a backwards facing hook thats formed or bent onto it. Ductwork is galvanized sheet metal. For duct sides longer than 36”, seven points must be taken. Something is def rotting inside my duct work. Duct came apart as you descibed. I would disassemble the rectangle first. Also, about a 1/8 inch … When the heat is on it smells so bad in the house and the air coming out of certain vents just wreaks. The installer in this change-out could propose the entire ductwork replacement, but usually homeowners put down such offers – too expensive! There was a 2 or 3 foot section that I was able to get apart, then the remaining 10-12 feet in one piece. Now we have flies coming out of the ductowrk. For duct sides of 30 through 36”, six points must be taken. AsktheBuilder.com: HVAC ductwork sizing is critical for proper heating and cooling in every room. Have to get the air back to the furnace. It also bends easily, so you can create a variety of things from this. duct systems.Any one of the system types, or a com-bination of different types, can be utilized to fit the needs of a particular structure. • Dampers on take-off duct runs allow for adjustments of air distribution. Thanks for the advice. • Never locate ducts at the end of the trunk line run. Found a 3/4 thick piece of styrofoam behind the outside siding. Now the sides are the part that actually holds it all together. Continue this process until the duct is removed as far as you need. Return air ducting is necessary in almost every room. It will weather fairly well. Use a flat screwdriver to release these buttons and it will come apart. • Always stagger take-off ducts by 12" to maintain pressure. A few months ago, I wrote a Duct Dynasty article on the ideal duct system. • In order to maintain velocity, reduce duct size. Aviator snips work fine to cut holes in a trunk line, but only if there’s enough space. A hole cutter works great in tight spots when replacing ductwork. Pull the duct section out and away to separate it from the rest of the the duct work. Step 4 Move on to the next connection and remove the screws. When you put 2 pieces of duct together, the drives butt right up against each other. So, I thought it would be fun to take a deeper look at branch duct takeoffs and how to overcome some of the most common problems associated with them. Step 5 Move to the next connection if necessary and repeat Step 4. If the duct side is less than 18”, then any readings you take should be taken from the center of equal areas that are no more than 6” apart, with a minimum of two points per side of the duct. This is the Drive. More Change-outs: The air filter casing swung the cold air drop a bit aside. I hope now someone would come up with a different idea. The general types of ... take into account when the furnace or air handler is installed in an attic is the requirement for an auxiliary drain pan, along with a … Then you take a piece of metal called a Drive and it slips right over the drives on the 2 pieces of duct. The most frequent comments and questions I received about this article were regarding branch takeoffs. If you’re dealing with close quarters and you own a right-angle drill or attachment, you may want to invest in a sheet metal hole cutter. These ductwork tips will help balance your air conditioning and heating system. ewwww I paid for a pro to clean the ducts and furnace but he didn't seem very "pro." Pull the duct out of this connection in the same way as Step 3.