Callout catches code violations, coordination issues, and design deficiencies before your PE stamp — like having a senior engineer review every sheet before you do.
Duct penetration through rated assembly lacks fire damper
IMC 2021 §607.5.1
Location2-hr rated corridor wall at Grid C-4
Issue
Mechanical drawing M-201 shows a 16"×12" supply duct penetrating the 2-hour rated corridor wall at Grid C-4 without a fire damper indicated. IMC §607.5.1 requires fire dampers at all duct penetrations of fire-resistance-rated assemblies.
AI Suggested Resolution
Add a combination fire/smoke damper (Type B, Class II) at the duct penetration. Coordinate exact location with architectural for wall cavity space. Provide damper schedule on sheet M-601 with UL listing, actuator type, and access door location.
⚠ MajorVentilationSheet: M-101▼
OA intake clearance below minimum — 8′ required from exhaust
ASHRAE 62.1-2022 §5.7
ℹ MinorDocumentationSheet: M-601▼
Equipment schedule missing operating weight for AHU-2
IMC 2021 §106.3.1
💡 AdvisoryEnergy EfficiencySheet: M-501▼
VFD not specified on AHU-2 — recommend for energy compliance
ASHRAE 90.1-2022 §6.5.3
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Three steps to a cleaner drawing set.
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01
Upload your PDF
Drop any multi-sheet drawing set. Callout reads title blocks, extracts sheet numbers, and identifies disciplines automatically.
02
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03
Review AI markup
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Built for PEs, not for demos.
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Exact code citations
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Disciplines
Every discipline on the drawing set.
Callout reviews across all major AEC disciplines, so you can run multi-trade sets in a single pass.
Senior drawing review costs $200–$250 per hour, at 0.5–1.0 hours per sheet. Callout does the first pass for pennies per sheet — catching the obvious issues so your PE can focus on the ones that actually need engineering judgment.
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