What is a duct trunk?
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.
How long can you run flex duct?
5 feet
An International Association of Plumbing and Mechanical Officials committee has approved a change to the group’s Uniform Mechanical Code, limiting the use of flexible ductwork to 5 feet or shorter runs. Flex duct manufacturers oppose the limitation.
Can you return air with flexible duct?
Yes, you can use flex ducts for your return air. However, to maximize its usefulness, it needs to conform to technical specifications such as its insulation rating, pressure checks, dust filters, duct sizing and placement, and lastly, the installation requirements.
What are main trunk lines?
This main trunk or distribution line often runs the length of a house and is punctuated by dozens of smaller feeder ducts that direct air into other areas of the home. The location of a trunk line depends on how and where the house was built.
Can you run flex duct vertically?
5. Vertically installed duct shall be stabilized by support straps at a maximum of 6 feet on center. NOTE: Factory-made air ducts may not be used for vertical risers in air duct systems serving more than two stories.
How long will flex duct last?
10 to 25 years
What is the functional lifespan of a flexible duct system? A search of industry articles, blogs, and chat rooms indicates it lasts from 10 to 25 years. Most flexible duct manufacturers warranty their products for about 10 years.
What is the main trunk line for a furnace?
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 an HVAC trunk line?
How long should a flex duct run be?
E. 1. Flexible duct shall be supported at manufacturer’s recommended intervals, but at no greater distance than four feet. Maximum permissible sag is 1/2 inch per foot of spacing between supports.