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Professional Service
Flat Oval Duct
Maximized Airflow, Minimized Height
The perfect solution for restricted ceiling spaces. Flat oval duct combines the aerodynamic efficiency of round spiral duct with the low profile of rectangular ductwork, offering superior performance in tight quarters.
Our Services
Space Saving
Ideal for buildings with limited ceiling plenum height.
Efficient Airflow
Better aerodynamic characteristics than rectangular duct.
Spiral Construction
Strong, rigid lockseam construction requires fewer supports.
Custom Fittings
Full line of matching elbows, transitions, and tees.
Why Choose Diaz Sheet Metal?
Solves low-ceiling clearance issues
Lower friction loss than rectangular duct
Aesthetically pleasing for exposed applications
Reduced noise generation
Longer lengths available to reduce joints
Available in galvanized, stainless, and aluminum
Our Process
1
Consultation
We determine if flat oval is the right solution for your space constraints.
2
Fabrication
Round spiral pipe is formed and then stretched into oval shape.
3
Fittings
Matching oval fittings are fabricated to precise dimensions.
4
Delivery
Careful handling to maintain oval shape during transport.
Frequently Asked Questions
When should I use flat oval duct?▼
Flat oval is best used when you need the volume of a large round duct but lack the vertical ceiling clearance to install it.
Is it harder to install than rectangular?▼
It installs similarly to spiral duct but requires care in handling. Because it is stiffer than rectangular duct, it often needs fewer supports.
Can flat oval duct be lined?▼
Yes, we can fabricate double-wall flat oval duct with insulation sandwiched between the inner and outer shells for thermal and acoustic control.
What connection types are available?▼
We offer slip fit connections for smaller sizes and flange connections (angle rings or AccuFlange) for larger dimensions.
Ready to Get Started?
Contact us today for a free estimate on your flat oval duct project.