Pressure & Duct Construction
Guidelines for spiral duct construction and pressure.
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Spiral Flat Oval Duct Fabrication
Architects, engineers, and building owners continue to become fans of spiral flat oval duct for their commercial projects. In addition to its attractive appearance, spiral flat oval has all the same benefits as traditional spiral round duct but can also fit into spaces where clearance is a challenge.
Here at SPOT we consider ourselves experts in spiral oval duct fabrication with years of experience as well as unmatched sizing capabilities- minor access from 3” up to 36”.
Many sheet metal contractors who fabricate their own duct choose to partner with SPOT to handle their flat oval requirements.
We stand ready to quote and fabricate any spiral flat oval duct required on your next project.
In comparing a simple duct system — 40’ of straight duct, a 90-degree elbow, a transition and three installed taps — it suggested that the installed rectangular duct section ($775 to $1375) was less expensive than the installed flat oval duct section ($975 to $2100). After 25 years and thousands of real-world cases where that suggestion was proven to just not be true, we are still battling the 80’s mentality that “flat oval is too expensive.”
Why Flat Oval Duct?
A lot more than just the “cost” has changed in the last 25 years. If just one of the following statements is true about your upcoming project, you need to immediately change your design to one using round and spiral flat oval duct.
- I have an AHU external static pressure of 2” WG or more
- My system is relatively free of obstructions and follows the most efficient layout
- My local energy code follows ASHRAE Standard 90.1-2010 or later
- I have concerns about sound
- Except where needed for noise control, I prefer ducts to be externally insulated to prevent future environmental concerns and make duct cleaning easier
- I would like the ducts to be as small as practical
- I’d like to follow the ASHRAE Advanced Energy Design Guides for my application
- I don’t want excessive duct leakage
- I want the least expensive duct system
- I care about what a duct system costs — to install and to operate
Learn about the benefits of spiral flat oval duct for your next project
If yours is a commercial HVAC project, you probably answered yes to most, if not all, of the above statements. We are going to give you the reasons why spiral flat oval duct is your best choice to satisfy each of those concerns:
Spiral flat oval duct gallery
Exposed Corrugated Flat Oval Duct with SPOT Flange Connection
Oval used in adaptive reuse of historical building converted to creative office space.
Interior Welding on Flat Oval Duct
Tack welding on a segment of flat oval pipe.
Flat Oval Pipe in Workshop
Pipe fitted with oval SPOT flange.
Flat Oval Seam Closing
Joining pieces to become flat oval duct.
Flat Oval Welding Close-Up
A close-up of interior welding on a flat oval duct.
Hand Welding Oval
Oval elbow duct is welded by hand.
Tack Welding Flat Oval Duct
Welder tack welds inside of gored elbow.
Flat Oval Duct on Forklift
Completed flat oval ductwork being transported for shipping
Pipe Stretched on Ovalizer
Oval tooling available to produce oval up to 36” minor axis.
CAD/CAM Software Utilized
SPOT assembly drawings provided with all spiral round and flat oval shipments.
Loading Flat Oval Duct on Ovalizer
Workers loading segment of flat oval duct on small ovalizer.
Stacked Oval Duct
Galvanized double wall oval duct with factory mounted SPOT flange.
Flat Oval Elbow
5 segment, east bend single wall elbow.
Installed Oval Duct
Exposed duct in office space allows for added clearance.
Large Oval Elbow Fabrication
Parts this size and larger are a common sight in our shop.
Large Oval Elbow Being Spot Welded
SPOT specializes in really large duct fabrication for installing contractors
Galvanized Oval Duct
Galvanized Oval duct installed in new school.
G90 Domestic Galvanized Oval Duct
Ends wrapped per customer request using SPOT DuctShield.
Oval Duct Fabrication Equipment
Oval Duct Fabrication Equipment
Oval Duct Fabrication Equipment
Oval Duct Fabrication Equipment
Resources, Downloads, & Submittals
Product Type
SMACNA Standard
Single Wall/Double Wall
Resource Type
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Spiral Pipe of Texas (SPOT) fabricates high quality, MADE IN THE USA sheet metal products for the heating, air conditioning and ventilation (HVAC) industries.
