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Professional Service
Flat Oval Duct Fabrication
Maximized Airflow Efficiency, Minimized Profile
Flat oval duct is the premier engineering solution for projects requiring the high-performance airflow of round duct within the tight vertical constraints of a rectangular plenum. Diaz Sheet Metal provides precision-fabricated flat oval systems that offer superior aerodynamics, reduced leakage, and a sleek modern appearance.
Our Services
Profile Optimization
Reduces vertical space requirements by up to 40% compared to equivalent capacity round duct.
Laminar Flow
Significantly better aerodynamic characteristics and lower pressure drop than rectangular duct alternatives.
Structural Rigidity
The spiral lockseam construction provides a high strength-to-weight ratio, requiring fewer supports and hangers.
Precision Geometry
Matching elbows, transitions, and tees fabricated to exact minor and major axis dimensions.
Why Choose Diaz Sheet Metal?
Ideal for high-end architectural designs and exposed ceiling systems
Significantly lower noise generation due to reduced turbulence
Available in major axis widths up to 90" and minor axis heights down to 6"
Fabricated in Galvanized, Stainless Steel, and Aluminum options
Compatible with double-wall acoustic and thermal insulation systems
Available in both spiral and long-seam welded construction for high-pressure
Our Process
1
Geometric Mapping
We calculate the optimal major/minor axis ratio based on your available ceiling height.
2
Precision Shaping
Round spiral pipe is expertly stretched and formed to maintain constant cross-sectional area.
3
Custom Fittings
CNC-cut fittings ensure seamless transitions from rectangular trunk lines to oval branches.
4
Quality Delivery
Sections are carefully handled and braced to maintain precise geometric tolerances during transit.
Frequently Asked Questions
When should I prioritize flat oval over rectangular duct?▼
You should choose flat oval when you need the aerodynamic efficiency and low leakage of round duct but have limited vertical clearance. It's also the preferred choice for high-end exposed architectural designs where aesthetics and noise control are critical.
What connection systems do you provide for flat oval?▼
We offer slip joints for smaller dimensions and specialized flange systems (like companion angle rings or proprietary oval flanges) for larger systems to ensure air-tight seals.
Can flat oval duct be insulated?▼
Absolutely. We specialize in double-wall flat oval duct, which includes a perforated or solid inner shell and a layer of fiberglass or mineral wool insulation for maximum thermal and acoustic performance.
Is flat oval duct SMACNA compliant?▼
Yes. All our flat oval fabrication follows SMACNA standards for gauge thickness and reinforcement based on the major axis dimension and the design pressure class.
Ready to Get Started?
Contact us today for a free estimate on your flat oval duct fabrication project.