Full Answer
What is the trunk line of a heating system?
So, it comes as no surprise that the trunk line of a heating system is the large duct leading out of the furnace that delivers the massive amounts of air it takes to heat or cool a house.
What is a trunk and branch HVAC system?
The trunk and branch system is a great way to distribute the air evenly throughout the house. An uneven airflow is usually due to a poor HVAC duct design. Uneven and poor airflow will result in a decrease in energy efficiency and over compensation for when the temperature is different in one room to another.
What is a trunk line and where is it located?
The location of a trunk line depends on how and where the house was built. If a house has a basement, the trunk line is usually located there, but in warmer regions or areas where houses lack basements, trunk lines can run in the attic area. As trunk lines move further away from the furnace, they often taper in size for greater efficiency.
How much CFM is in a 16 inch trunk line?
For the main trunk a 16" metal trunk line will flow 1210-CFM at 867-fpm velocity. To convert for fiber board: 156" *X 16"= 256 *X 0.7854 = 201.0624-sq.ins| divided 144 = 1.3962666-sf of open area.
Why is the trunk and branch system used?
Where Is It Used? The trunk and branch system is a great way to distribute the air evenly throughout the house. An uneven airflow is usually due to a poor HVAC duct design. Uneven and poor airflow will result in a decrease in energy efficiency and over compensation for when the temperature is different in one room to another.
What is a trunk made of?
The trunk is made of solid metal and the branches are made of flex duct. Since the trunk will carry all of the air into the house, it should remain straight and undamaged in order to maximize its airflow capacity. The branches are made of flex duct. They are flexible to allow for maneuvering through the house in order to allow it to get ...
Why are air vents flexible?
They are flexible to allow for maneuvering through the house in order to allow it to get the air to reach its final destination. There should not be any holes through the trunk or branches which could compromise the airflow throughout the house.
How does a trunk work?
The trunk will come to an end where the air will collect and escape through the branches.
Can you use trunk and branch ducts in a 2 story house?
Although a trunk and branch system is not used in all cases, it is a good option to use, particularly for homes that are no more than 2 stories high. For homes that are more than 2 stories, there are other duct designs that can be used. Pin It on Pinterest. Shares. Menu.
Why do you need a trunk line for HVAC?
There could be a couple of reason why you need to install a trunk line for HVAC. The trunk is sized incorrectly so you need to replace it, building a home, or you just want too. Whatever your reasoning I want to share how to install a trunk line yourself to save you money. Because it could save you thousands!
How to attach trunk line to wood?
Attach trunk line to wood using 1.25″ screws ( use two for both sides) but DO NOT over tighten.
Can an HVAC tech install a furnace?
It was not hard but they both needed to be adjusted for the elevation & test levels to work properly. So if you do not know someone that is an HVAC tech, hire a PRO to install them! You could have them placed before hand and have the PRO hook everything up but call the company first to see if they will do that.
Can you install a trunk line?
Once you have all your supplies you can install the trunk line. The company that we used supplied all the metal pieces needed for the trunk line. They also gave us a paper that showed us where to place each trunk piece.
What adds friction loss to a duct system?
All duct fittings, ells, tees, reducers, take-offs, etc., add a certain amount of friction loss to an hvac system. Even the straight ductwork in a system adds a certain amount of friction loss.
How many supply branches are connected to main trunk before a reducer changes duct size?
Reducer - usually 3 or 4 supply branches are connected to main trunk before a reducer changes duct size. Can be rectangular, square, or round.
What is ductwork in HVAC?
Ductwork is simply an air delivery system. A delivery system for all forced air systems, furnace or air handler, heating or air conditioning, or both.
What is friction loss in ducted air?
Each component of the ducted air delivery system, from the air handler to the registers, adds a certain amount of resistance to the airflow . This resistance is friction loss .
What is a supply plenum?
Supply Plenum - usually on top of air handler for the initial distribution of conditioned air through connected ductwork.
What is stack head?
Stack head - a boot for a wall register.