What are the main types of duct used in commercial construction?
The Types of Commercial HVAC Ducts
- Sheet Metal Air Ducts. Constructed of galvanized steel or aluminum, these air ducts are the most common type of rigid air ducts.
- Fiberglass Lined Air Ducts. Some ducts are then further lined with an internal or external fiberglass.
- Fiberboard Air Ducts.
- Flexible Air Ducts.
What is the minimum gauge duct used in commercial ductwork?
18 gauge
Galvanized Steel Construction: Conform to the requirements of medium pressure ductwork specified hereinbefore but minimum duct gauge shall be 18 gauge (1.31 mm).
What are the types of ducting for HVAC system?
There are three main types of rigid ductwork: sheet metal ducts, fiberglass lined ducts, and fiberboard ducts. Sheet Metal Ducts: Sheet metal ducts are usually made of either galvanized steel or aluminum. Aluminum ducts are lightweight and very easy to install.
What is an SA duct?
Patented AP Armaflex SA Duct Liner is a black flexible elastomeric thermal insulation with a self-adhering backing. Its closed-cell elastomeric foam structure helps reduce or eliminate conditions that lead to biological contamination and bioaerosols in commercial air systems.
Which is thicker 26 gauge or 30 gauge?
In other words, a 24 gauge sheet of galvanized steel is actually thicker than a 26 gauge sheet of galvanized steel. And even though uncoated steel and galvanized steel are both measured by the MSG, 30 gauge galvanized steel is defined as thicker than 30 gauge uncoated steel.
What gauge should ductwork be?
Low Pressure Fittings for Residential and Light Commercial HVAC Applications
| Largest Duct Dimension (width or height) | Steel Gauge | Aluminum Gauge |
|---|---|---|
| Thru 12″ | 26 | 24 (.020) |
| 13″ – 18″ | 24 | 22 (.025) |
| 19″ – 30″ | 24 | 22 (.025) |
| 31″ – 42″ | 22 | 20 (.032) |
What type of metal is used for ductwork?
Galvanized steel
Galvanized steel is the most common material used in ductwork fabrication.
What is a starting collar for?
Start Collars from The Duct Shop are an economical way for starting a new duct run from your supply or return plenum. They are manufactured from the highest quality galvanized sheet metal and to our exacting standards.
How far apart should duct takeoffs be?
24′
Ideally, you should allow at least 24′ between takeoffs and at the end of any duct run.