Guides
9 cornerstone guides on RTU curb replacement — measuring an existing curb, choosing between a curb adapter and a new curb, manufacturer-specific compatibility notes for Carrier, Trane, Lennox, York, AAON and Rheem/Ruud, and why orientation changes the whole adapter. Written for HVAC contractors and building owners, grounded in SMARTCurb's own verified data.
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Curb Adapter vs. New Roof Curb: Which Does Your RTU Replacement Need?
When a rooftop unit reaches end of life, the roof curb underneath it usually doesn’t need to go with it. Here’s how to tell which path your replacement actually needs.
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How to Measure an Existing Roof Curb
Get these numbers right before you call a fabricator, and the whole adapter comes back correct the first time. Get the datum wrong, and every dimension downstream is wrong with it.
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Replacing a Carrier Rooftop Unit: Curb Compatibility Guide
115 verified Carrier RTU curb footprints, one real shared-curb fact worth knowing, and what actually determines whether your replacement needs a new curb or an adapter.
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Replacing a Trane Rooftop Unit: Curb Compatibility Guide
68 verified Trane RTU curb footprints, the Voyager-to-Foundation shared curb, and why "IntelliPak" alone doesn’t tell you enough to guarantee a fit.
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Why Rooftop Unit Orientation Matters for Curb Adapters
The same two units, mounted 90 degrees apart, produce two completely different adapters — here’s the mechanical reason orientation is not a detail, and how the four options actually get resolved.
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Replacing a Lennox Rooftop Unit: Curb Compatibility Guide
75 verified Lennox RTU curb footprints, five current product lines, and the much larger legacy CHA/GCS reality most contractors actually run into on an older roof.
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Replacing a York Rooftop Unit: Curb Compatibility Guide
47 verified York RTU curb footprints, the Predator-to-Sun Pro rebrand hiding behind the ZF model code, and the Sunline legacy that both of them grew out of.
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Replacing an AAON Rooftop Unit: Curb Compatibility Guide
42 verified AAON RTU curb footprints — and an honest look at why over a third of them need a few numbers typed in by hand before SMARTCurb can compile an adapter.
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Replacing a Rheem/Ruud Rooftop Unit: Curb Compatibility Guide
34 verified Rheem/Ruud RTU curb footprints — the current Renaissance, Resolute, and Endeavor lines, and the older lettered-prefix packaged units most contractors still find in the field.