Duct takeoff by system

Fitting families

Family names that differ only by size or angle (e.g. “Reducer: 600”, “Reducer: 700”) are bundled into one row. Each bundle is auto-detected as a SMACNA / ASHRAE fitting type. If one is wrong, pick the right type and it applies to every name in the bundle. “Ignore” leaves it out of the takeoff.

Duct material

Default is G.I. Pick another default for a whole system (e.g. B.I for KED), or override single sizes inside a system. A system with more than one material gets a separate section per material, for rectangular and round.

Density is only used for the Tons column. Thickness comes from the gauge table above, so Tons is exact for steel and approximate for other materials. Supports and insulation are not split by material.

Support counting (rectangular and round)

Each duct row in the Revit export is treated as one run, so spacing is checked per run instead of on the pooled length. Short pieces between fittings each get their own end supports in the first mode; use the second mode if your rows are fitting-to-fitting segments of one continuous run.

Rectangular supports

Pick a hanger type. Sizes are picked by the duct's largest side. Bar / channel / strap is rounded up to supplier standard lengths.

Trapeze (angle bar or strut channel): 1 cross member (largest side + 2 × allowance) · 2 threaded rods · 2 expansion bolts · 4 nuts · 4 washers. Strap hanger: 1 strap (duct perimeter + 2 × allowance) · 2 expansion bolts. Wall bracket: 1 angle (largest side + 2 × allowance) · 2 expansion bolts. Bracket + wrap-around strap (near walls / columns): the bracket above + 1 strap around the duct + 2 bolt & nut sets. Supports per duct = ROUNDUP(length ÷ spacing). Rod settings only apply to trapeze types.

Round duct supports

Hanger + fasteners. Sizes are picked by the duct diameter. Band is rounded up to supplier standard lengths.

Band + rod type: each support = 1 band loop (π × diameter + 2 × allowance) · 2 threaded rods · 2 expansion bolts · 4 nuts · 4 washers. Angle bar trapeze: 1 angle bar (diameter + 2 × allowance) · 2 rods · 2 expansion bolts · 4 nuts · 4 washers. Wall bracket + wrap-around band: 1 angle bar + 1 band loop · 2 expansion bolts · 2 bolt & nut sets. Strap / wire type: each support = 1 loop + 2 fasteners. Supports per duct = ROUNDUP(length ÷ spacing).

Insulation per system

Tick “No insulation” for systems without insulation. Untick to enable thickness & material. Quick‑set: AC Only = SAD / RAD, everything else counts as ventilation.

Summary sheet

Tick the system sheets to include. The Summary sheet tallies their duct length, insulation and supports by formula. Untick all to skip it. Quick‑set: AC Only = SAD / RAD, everything else counts as ventilation.

Pipe fitting families

Family names that differ only by size or angle are bundled into one row. Each bundle is auto-detected as a pipe fitting type (elbows use the Angle column when there is one; tees with mixed sizes become reducing tees). If one is wrong, pick the right type. “Ignore” leaves it out.

Pipes are counted by length only: no gauge, sheets or tons. Sizes are read as nominal DN (inch sizes such as 2-1/2" are converted to DN65).

Pipe material

Each system sheet is split by material. The file’s Material / Pipe Segment column is used when it is recognised, otherwise the system or default material. Fittings without a material take the material of the pipe of the same size in the same system. The material’s class (steel, copper, plastic) picks the support spacing.

Pipe insulation per system

Chilled / hot water systems start insulated, others start without. Insulation length = pipe length + wastage, rounded up to sections.

Pipe supports

Spacing and rod size are picked by the pipe DN and the material class. SMACNA’s hanger tables cover ducts; for piping SMACNA refers to MSS SP-58 / SP-69 hanger spacing (water service), which this preset follows. Edit any value.

Supports are counted per pipe run (each row of the pipe export): ROUNDUP(length ÷ spacing) + 1 with end supports, or without the +1 / pooled by size via the Support counting setting. Rod-hung types (clevis, split ring, band, spring, roller): 1 hanger · 1 threaded rod · 1 expansion bolt · 2 nuts · 2 washers per support. Trapeze: supports ÷ pipes per trapeze = trapezes (use 2 for a supply + return pair); each has 1 strut channel of the trapeze length · 2 rods · 2 bolts · 4 nuts · 4 washers, plus 1 pipe clamp per pipe support. Wall bracket: 1 angle · 1 U-bolt · 2 nuts · 2 expansion bolts. J-hanger, strap and saddle: 1 item · 2 fasteners. Insulated systems add 1 shield / saddle per support. Use band hangers or saddles on insulated lines, spring hangers for vibration or vertical movement, roller hangers for axial expansion, and J-hangers / straps only on small light pipes. Riser clamps (vertical pipe) are not included because the schedule has no vertical / horizontal split; count them per floor. Flexible hose uses half the steel spacing (edit the support table to suit the product). Plastic spacing is a typical value for PVC / PPR at chilled water temperature; check the manufacturer’s table.

Summary sheet

Tick the system sheets to include. The Summary sheet totals pipe by system type and material, by material and size, fittings, insulation and supports. Untick all to skip it.