What is a trunk line in HVAC? check this out – hvac trunk lines

The trunk line is a line of ductwork that serves as the central distribution source for your ductwork system. It is attached directly to the plenum and runs through the entire length of your house. Note: The trunk line is typically attached six inches from the top of the plenum.

What were trunk lines?

Definition of trunk line

1 : a transportation system (such as an airline, railroad, or highway) handling long-distance through traffic. 2a : a main supply channel (as for gas or oil)

Is round or square duct better?

Round air ducts are best suited for high-pressure HVAC systems. Their design creates less friction, allowing air to flow easier throughout the building. Rectangular ducts aren’t as efficient with their airflow, which means they can create more harm than good in a high-pressure system.

Why is it called a trunk line?

The term Trunk derives from a structure of a tree where one trunk has many branches that it feeds with nutrients. Similarly in in telecommunications or networking application, an infrastructure (the tree) has one trunk line that carries many voice and data signals simultaneously into many users(the branches).

Why was it called a trunk call?

In the UK, all calls were chargeable and the term trunk calling was adopted for long-distance calls. Calls to toll area exchanges were connected on-demand whilst the originating subscriber waited thus improving service and reducing operator costs.

What happens when you reduce duct size?

The key takeaway here is that air moves from a larger to a smaller duct, the velocity increases. When it moves from a smaller to a larger duct, the velocity decreases. In both cases, the flow rate — the amount of air moving through the duct, in cubic feet per minute — stays the same.

How far apart should duct takeoffs be?

Ideally, you should allow at least 24′ between takeoffs and at the end of any duct run.

What is a duct takeoff?

Top takeoff is used to cut into plenum or rectangular duct to begin a trunk line or branch-like runs. It allows transition from an air plenum or square duct to a round pipe.

Should you insulate ductwork in attic?

When HVAC ducts are installed in a vented attic in a dry climate, bury the ducts in attic insulation to protect them from temperature extremes in the unconditioned attic space. Install ductwork so that it is in direct contact with (i.e., laying on) the ceiling and/or truss lower cords.

What is the most efficient duct shape?

Round. Round ducts are the most efficient in transporting air. They use less material than rectangular ducts to handle the same amount of air.

Does every room need an air return?

While it is a myth that air return grilles are required in each and every room in the house, it is definitely necessary to have more than one of these grilles installed at strategic places in the house. Likewise, you can also install these in rooms that have a high footfall or usage in the house.

How do you increase airflow in air ducts?

Increasing airflow in ductwork can be done by cleaning the air filters and ductwork. By adding inline duct booster fans and/or air dampers significantly can improve airflow in weak areas.

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