Replacing a rooftop unit (RTU) isn’t always as simple as swapping one box for another. Most of the time, the new unit has different dimensions, connection points, or airflow requirements than the old one. That’s where RTU curb adapters come in.
At Madon Sheet Metal, we specialize in fast, precise curb adapters that make RTU changeouts easy for mechanical contractors and building engineers—without needing to reroute ductwork or redesign the roof opening.
🔧 What Is an RTU Curb Adapter?
A curb adapter is a custom-fabricated sheet metal box that sits between your existing rooftop curb and the new RTU. It redirects airflow to match the supply and return openings of the new unit—saving time, labor, and hassle.
You can think of it like an “adapter plug” for HVAC systems: it bridges the gap between old and new.
🏢 When Do You Need One?
You’ll need a curb adapter when:
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The existing RTU and new RTU have different footprints
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The supply/return openings don’t align
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You want to avoid costly duct or curb modifications
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The jobsite timeline is tight and crane time is limited
They’re especially common during:
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Energy-efficiency retrofits
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Emergency rooftop unit replacements
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Brand-to-brand unit swaps (e.g., replacing a Carrier with a Trane or Lennox)
⚙️ What Makes a Good Curb Adapter?
A good adapter:
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Maintains airflow performance (no leaks or bottlenecks)
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Matches roof pitch and existing curb height
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Includes internal baffles, turning vanes, or dampers as needed
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Ships on time, built to spec
Madon Sheet Metal builds every adapter to fit your exact specs, with options for stainless steel, black iron, or galvanized steel. We also accommodate:
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Insulation
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Rain diverters
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Hinged access panels
✅ Why Choose Madon Sheet Metal?
We know how critical timing is during RTU replacements. That’s why:
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We turn around curb adapters quickly
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We work closely with reps and contractors to get it right the first time
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We’re a union shop in Chicagoland
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Every adapter is welded or sealed to your spec, built to last
📞 Need a Curb Adapter Fast?
Whether you have unit submittals in hand or just a rooftop photo, we’ll help you size and build the right adapter—fast.
