Measure rectangular, circular and flexible duct on PDF drawings accurately — scale calibration, fittings, hangers, insulation and fire dampers, with the m²/kg conversions estimators actually use.
Start with plant, duct, pipe, controls and terminal schedules. Measure main routes first, then branchwork, accessories, supports, insulation and controls interfaces in a controlled sequence.
Duct, pipe and terminal schedules grouped by system, plant and accessory counts aligned with manufacturer schedules, fabrication and installation outputs separated for pricing.
This ductwork measurement & estimating guide for contractors guide is part of the Symbol Magic Pro free resource library — practical, contractor‑written advice covering HVAC takeoffs, estimating workflows, and digital best practices for the trades.