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Professional Service
Welded Grease Duct Fabrication
NFPA 96 Compliant Kitchen Exhaust Solutions
Diaz Sheet Metal specializes in the fabrication of liquid-tight, heavy-gauge welded grease duct for commercial kitchen environments. Our black iron and stainless steel systems are engineered for maximum fire safety, strictly following NFPA 96 and local mechanical codes to ensure a 100% leak-proof system.
Our Services
Light Test Guarantee
Every section is rigorously inspected. We guarantee all welded seams will pass the industry-standard light test for code compliance.
MIG/TIG Precision
Utilizing advanced continuous welding techniques to ensure liquid-tight integrity and structural durability.
Fire Safety Rating
Fabricated with 16 GA to 10 GA Black Iron or Stainless Steel to withstand extreme temperatures in the event of a grease fire.
NFPA 96 Access
Strategic placement of UL-listed, liquid-tight cleanouts and access doors to facilitate required periodic cleaning and inspections.
Why Choose Diaz Sheet Metal?
100% Leak-proof performance for high-intensity commercial kitchens
Available in Carbon Steel (Black Iron) and 304/316 Stainless Steel
Custom-fabricated transitions, plenums, and roof curb adapters
Seamless integration with 3M™ Fire Barrier Duct Wrap systems
Expert engineering support for complex kitchen exhaust routing
Rapid turnaround to meet restaurant opening and inspection schedules
Our Process
1
NFPA Code Review
We review your kitchen layout and hood specs to ensure full mechanical code alignment.
2
Precision Cutting
Heavy-gauge components are CNC-plasma cut for perfect fitment prior to assembly.
3
Certified Welding
Continuous liquid-tight welding performed by certified fabricators in our MD facility.
4
Compliance Verification
Final light-test and inspection before being tagged and shipped to your job site.
Frequently Asked Questions
What gauge is required for grease duct?▼
Per NFPA 96 and most local codes, grease duct must be fabricated from at least 16 GA Carbon Steel (Black Iron) or 18 GA Stainless Steel. We offer even heavier gauges (up to 10 GA) for industrial or specialized applications.
Do you provide field-welding services?▼
Yes. While we maximize shop fabrication to ensure quality, our team can provide expert field-welding and installation to complete the final system connections at your site.
How do you handle grease duct cleanouts?▼
We provide and install UL-listed, liquid-tight access doors designed specifically for high-temperature grease applications. These are spaced strategically to ensure every inch of the duct is reachable for cleaning.
Is your grease duct compatible with fire-wrap?▼
Absolutely. We often provide a complete package including the welded duct and the 3M™ Fire Barrier Duct Wrap 615+, ensuring a fully compliant zero-clearance-to-combustibles assembly.
Ready to Get Started?
Contact us today for a free estimate on your welded grease duct fabrication project.