Grease Duct Exhaust Systems: What Building Owners Need to Know

When it comes to fire safety and ventilation in commercial kitchens, grease duct exhaust systems play a critical role. These systems are responsible for venting smoke, grease-laden vapors, and heat from cooking equipment—helping to maintain indoor air quality and, more importantly, reduce the risk of fires.

At United Chimney, we specialize in the design, installation, repair, and replacement of grease duct exhaust systems for restaurants, food service operations, and commercial buildings across the New York City area.

In this article, we’ll explain why these systems are so important, the key code requirements you need to be aware of, and how proper maintenance can save you thousands in repairs—or worse, emergency damage.

What Is a Grease Duct Exhaust System?

A grease duct exhaust system is a specially engineered duct system that captures and removes grease-laden vapors and airborne contaminants generated by commercial cooking equipment such as:

• Fryers
• Griddles
• Charbroilers
• Pizza ovens
• Wok ranges
• Kettles and rotisseries

The system typically includes:

• Hood – Positioned over the cooking area to capture vapors
• Grease Ductwork – Carries the vapors through the building to the exterior
• Exhaust Fan – Located on the rooftop or exterior to vent air out of the building

Because these systems handle flammable vapors and grease buildup, they must be constructed with fire-rated materials and follow strict codes such as NFPA 96.

Why Proper Grease Duct Design Matters

Improperly designed or installed grease ducts can result in:

• Fire Hazards – Grease buildup is a serious fire risk; even a small spark can ignite residue inside the ductwork.
• Code Violations – Non-compliant systems can lead to failed inspections, fines, or forced shutdowns.
• Poor Airflow – Incorrect duct sizing or placement can reduce efficiency and lead to smoky, uncomfortable kitchen environments.
• Costly Repairs – Poor design accelerates wear and tear on exhaust fans and can damage surrounding structures if not properly insulated or sealed.

At United Chimney, we design each grease duct exhaust system to meet the specific needs of your space, ensuring that airflow, fire safety, and local code compliance are all accounted for.

Grease Duct Code Requirements: What You Need to Know

According to NFPA 96 and local NYC building codes, grease duct systems must meet the following criteria:

• Constructed of stainless steel or black steel with a minimum thickness of 16 gauge
• Welded, liquid-tight seams—no rivets or fasteners that penetrate the duct wall
• Installed with required clearances from combustible materials
• Equipped with access panels for regular cleaning and inspection
• Properly sloped to allow for grease drainage
• Insulated and enclosed when routed through fire-rated areas

United Chimney ensures that all of our systems meet or exceed national fire code standards and are fully compliant with the NYC Department of Buildings (DOB) regulations.

Grease Duct Exhaust Services from United Chimney

Whether you’re building a new restaurant or retrofitting an older system, United Chimney offers turnkey grease duct solutions, including:

System Design & Engineering

We work with restaurant owners, architects, and mechanical contractors to design systems that are both functional and code-compliant—tailored to your kitchen layout and equipment.

New Installations

We provide professional installation using UL-listed, fire-rated components, ensuring safe and efficient operation from day one.

Repair & Replacement

From damaged ductwork to failing fans, our team can assess and replace aging systems with minimal disruption to your business.

The Cost of Neglecting Your Grease Duct System

Failing to maintain or upgrade your grease duct system can result in:

• Fire-related property damage
• Health and safety violations
• Business interruptions
• Increased insurance premiums
• Expensive emergency repairs

Routine inspections and professional servicing help protect your investment and keep your business running smoothly.

Why Choose United Chimney for Grease Duct Exhaust Services?

• Expertise in Commercial Venting Systems
• Code-Compliant Installations & Repairs
• Turnkey Project Management, Including DOB Filings
• Proven Experience with Complex Commercial Spaces
• Service Across NYC and the Tri-State Area

Whether you’re opening a new location or need to bring an existing system up to code, United Chimney is your trusted partner for grease duct exhaust systems in NYC and beyond.

Contact us today to schedule a consultation or site visit. Let’s keep your kitchen safe, efficient, and compliant—without the stress.