Welded Grease Duct Fabrication & Commercial Ductwork
A leaky or poorly built grease duct can shut down service, fail inspections, and create a real fire risk. We fabricate and install welded grease duct systems built to NFPA 96 and the IMC so your Type I hood performs reliably and your kitchen stays open. This page explains exactly how we design, build, and verify grease ductwork for restaurants, hotels, and foodservice operations.
Why proper welded grease ducts matter
Reduce fire risk with leak-resistant welded seams and correct grease drainage.
Avoid failed inspections and rework from non-compliant construction.
Protect rooftop and building structure with correct supports and clearances.
Improve long-term reliability and lower lifecycle maintenance costs.
Keep grease contained and accessible for safe cleaning.
Ensure compatibility with fire suppression and rooftop terminations.
Who we help and where we work
We serve commercial kitchens, multi-unit restaurants, hotels, institutional kitchens, and mobile operations across Delaware. We handle new construction and retrofit projects where durability and code compliance are required.
What we deliver — six code-focused capabilities
Shop drawings and CAD layouts prepared for permit submission.
In-house welded grease duct fabrication with material traceability.
On-site welding, assembly, and pitched runs for grease drainage.
Code-compliant access panels, cleanouts, and inspection openings.
Structural supports, curb adapters, and rooftop termination assemblies.
Pressure and visual testing plus inspection-ready documentation.
Six common fabrication features that set our work apart
18-gauge stainless or specified gauge per project requirements.
Full penetration welds where required and certified welding procedures.
Pitched horizontal runs and drip pans on low points.
Access panels placed for safe cleaning and maintenance.
Fire-rated penetrations and clearances maintained to IMC and NFPA 96.
Detailed labeling and as-built drawings for future service.
Our Fabrication & Installation Process (clear, step-by-step)
- Site assessment and equipment survey: We measure roof, hood, and clearance constraints.
- Design & shop drawings: We produce detailed CAD drawings for permits and coordination.
- Material procurement & shop fabrication: We prefabricate to tighten tolerances and reduce on-site time.
- Delivery & staged installation: We assemble and weld sections on site, maintaining pitch and clearance.
- Testing & inspection preparation: We perform leak and visual checks, document welds, and complete test sheets.
- Handover with documentation: You receive as-built drawings, material certifications, and inspection packets.
Common problems we solve
- Non-welded duct causing grease leaks and failed inspections
- Poorly pitched runs that trap grease and create maintenance hazards
- Inaccessible cleanouts that increase cleaning time and miss fire-code access points
- Roof terminations that leak or fail to match rooftop curb configurations
- Fabricators using incorrect material gauge or untraceable components
- Coordination failures between hood, suppression, and duct trades
Inspection support and documentation
We know what inspectors expect. Every duct project includes:
Permit-ready shop drawings and detail sheets.
Welding procedure notes and welder certifications.
Material certificates and traceability.
Access panel locations and cleaning procedure recommendations.
Post-install test reports and annotated photos for final walkthroughs.
A checklist of maintenance intervals and cleaning best practices.
Trust, standards, and guarantees
- Work performed to current NFPA 96 and International Mechanical Code standards.
- Certified welding procedures and documented welder qualifications.
- In-house fabrication for quality control and faster turnaround.
- Inspection-ready deliverables and post-install support.
- Professional roofing transitions and weatherproof terminations.
- Follow-up support and maintenance guidance to keep the system compliant.
Frequently Asked Questions
In most jurisdictions NFPA 96 requires welded or equivalent grease containment for Type I systems. Local codes vary, so we confirm requirements during the site survey.
Typical fabrication runs 1–2 weeks depending on size. On-site installation varies by project complexity. We provide timelines with every quote.
Yes. Shop-fabricated sections reduce on-site welding and shorten kitchen disruption.
Yes. We coordinate penetrations, supports, and termination details so all trades align for inspection.
Ready to order shop drawings or start fabrication?
Stop guessing about duct quality. Get a permit-ready plan and a welded system that performs as expected.
Call: 302-653-4111, or request a quote online.