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Professional Service
Rectangular Duct
Commercial & Industrial Standard
Precision-fabricated rectangular ductwork for main trunk lines and complex HVAC distributions. Manufactured to SMACNA standards with options for internal lining and various connection types.
Our Services
Custom Sizes
Fabrication of any cross-sectional dimension to fit your plans.
Connection Types
S&D (Slip & Drive) or TDC (Transverse Duct Connection) flanges.
Insulated Options
Available with 1/2", 1", or 2" internal acoustic/thermal liner.
SMACNA Standards
Gauge and reinforcement determined by pressure class requirements.
Why Choose Diaz Sheet Metal?
Efficient space utilization in low-clearance ceilings
Easy to branch off for zoning and distribution
TDC connections for superior air-tightness
Reduced field labor with pre-assembled sections
Structural rigidity for high-pressure systems
Clean, professional appearance
Our Process
1
Takeoff
We review your mechanical drawings for accurate sizing.
2
Coil Line
Automated fabrication ensures consistent quality and speed.
3
Assembly
Seams are closed and flanges applied in our shop.
4
Delivery
Stacked and tagged for organized delivery to your site.
Frequently Asked Questions
What connection types do you offer?▼
We offer standard Slip & Drive (S&D) for smaller ducts and TDC (Transverse Duct Connection) 4-bolt flanges for larger, high-pressure systems.
Can you line the ductwork?▼
Yes, we have an automated coil line that can apply acoustic and thermal liner during fabrication, saving you field labor.
What gauges can you fabricate?▼
We typically fabricate rectangular duct from 26-gauge down to 18-gauge galvanized steel, meeting all SMACNA pressure class standards.
Do you make transitions and fittings?▼
Yes, we fabricate all necessary square-to-rounds, elbows, offsets, and transitions to complete your system.
Ready to Get Started?
Contact us today for a free estimate on your rectangular duct project.