• 60
    Years of
    Experience

Commercial HVAC Curb Adapters Built for RTU Replacement

MicroMetl designs and manufactures commercial HVAC curb adapters engineered for seamless rooftop unit replacement, helping new RTUs fit existing roof curbs with accuracy and confidence.

MicroMetl Curb Adapters

Our solutions support contractors, engineers, and distributors with precision-built products designed to preserve roof integrity, streamline installation, and meet real-world retrofit application demands.

A curb adapter serves as the engineered transition between an existing roof curb and a new rooftop unit. It allows the replacement RTU to properly seat on the existing curb while aligning supply and return openings with the existing ductwork. By avoiding unnecessary curb removal and roof modifications, curb adapters help reduce downtime, control installation costs, and minimize the risk of roof leaks.

MicroMetl curb adapters are designed for compatibility with a wide range of rooftop unit replacement applications, including manufacturer-to-manufacturer changeouts, equipment upgrades, and projects where existing curb conditions must remain in place. Each unit is manufactured in the United States using precision fabrication and rigorous quality control standards, ensuring accurate fit, dependable transitions, and long-term durability in the field.

Whether you are replacing aging equipment, changing RTU manufacturers, or working around existing curb and duct conditions, our focus is on delivering application-ready solutions—curb adapters that simplify installation, reduce field modifications, support proper airflow alignment, and provide confidence that the new unit fits and performs as expected.

Start Configuring Your Curb Adapte Talk to a Curb Adapter Expert
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Watch How MicroMetl Curb Adapters Work

See how MicroMetl curb adapters perform in real-world rooftop unit replacement applications. From existing curb measurement and RTU matching to duct transition alignment and installation, our solutions are designed to simplify changeouts, preserve roof integrity, and ensure reliable system performance.

MicroMetl curb adapters bridge the gap between existing roof curbs and new rooftop units while helping align supply and return openings with existing ductwork. By reducing the need for field modifications and avoiding unnecessary curb removal, they help streamline retrofit projects, reduce downtime, and deliver dependable performance in the field.

Start Configuring Your HVAC Curb Adapter
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How to measure for a Curb Adapter

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Search HVAC Curb Adapters by Model or Part Number

Access our complete catalog of HVAC curb adapters and quickly locate the exact solution required for your rooftop unit replacement project.

Our Company

Why Choose MicroMetl HVAC Curb Adapters

MicroMetl delivers commercial HVAC curb adapters engineered for accurate fit, efficient RTU replacement, and reliable performance in real-world retrofit applications. 
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Precision Manufacturing You Can Rely

MicroMetl curb adapters are designed and manufactured in the United States using precision fabrication and rigorous quality control standards, ensuring accurate fit, durable construction, and dependable performance in demanding rooftop environments.

Designed for Existing Curb Compatibility

Our curb adapters are engineered to help new rooftop units fit existing curb conditions, reducing the need to remove roof curbs, disturb roofing materials, or perform costly field modifications during equipment replacement.

Engineered for Airflow Alignment and Internal Transitions

Designed around the new RTU and existing duct layout, MicroMetl curb adapters help align supply and return openings while supporting efficient airflow through properly planned internal transitions.

Seamless RTU Replacement

Built for compatibility with a wide range of rooftop unit replacement applications, MicroMetl curb adapters simplify manufacturer-to-manufacturer changeouts, equipment upgrades, and retrofit projects where fit and installation speed matter.

Reliable Supply and Responsive Lead Times

With U.S.-based manufacturing facilities and a strong distribution network, MicroMetl delivers dependable availability, responsive lead times, and consistent product quality to keep replacement projects moving forward.

FAQs: HVAC Curb Adapters

Find quick answers about MicroMetl HVAC curb adapters, customization options, and product performance.

An HVAC curb adapter is a retrofit accessory installed between an existing roof curb and a new rooftop unit. It allows the replacement unit to fit the existing curb while transitioning the new supply and return openings to align with existing ductwork.

A curb adapter is placed on top of the existing roof curb, and the new rooftop unit is installed on top of the adapter. Inside the adapter, transitions help route supply and return airflow between the new unit layout and the existing curb and duct openings.

A curb adapter is commonly needed when replacing an older rooftop unit with a new model that has different dimensions, supply and return locations, or cabinet configuration. It is especially useful when the existing curb is still usable and the roof should not be disturbed.

MicroMetl offers curb adapter solutions designed for a wide range of rooftop unit replacement applications, including standard changeouts, custom retrofit conditions, manufacturer-to-manufacturer transitions, and projects requiring specific supply and return alignment.

Curb adapters help reduce field modifications, avoid unnecessary curb removal, preserve roof integrity, and support proper airflow alignment. This helps contractors complete RTU replacement projects more efficiently while reducing installation risk and downtime.

To configure a curb adapter, you typically need the existing unit or curb information, replacement rooftop unit model, curb dimensions, supply and return opening locations, airflow requirements, and any site-specific installation considerations.

You can request a quote through our website or by contacting our team directly. Provide your model number, existing curb information, replacement unit details, and project requirements for fast and accurate support.