HVAC
Ductwork made from sheet: duct sections, elbows, transitions and fittings developed flat, with their seams and bend lines. A drawing whose industry is HVAC offers these tools in the toolbar and in Edit › Tool.
Tools
| Tool | Does | |
|---|---|---|
| Seam and Hem | A seam's or hem's allowance on an edge, its corners notched | |
| Rectangle to Round | A rectangle-to-round transition developed flat, with its bends | |
| Elbow Gores | The gores of a segmented round elbow, laid out flat | |
| Flat Pattern | The flat blank of a bent part from its flanges' sizes, with its bend lines | |
| Bend Line | A bend line with a note of its angle and bend allowance or deduction, UP or DOWN | |
| Corner Relief | A round, square or tear-drop relief where two bends meet | |
| Pipe Saddle | The wrap-round cutting template of a branch pipe meeting a main pipe | |
| Hole Pattern | Holes on a bolt circle (PCD), in a row or in a grid, measured from an edge | |
| Mitre Segment | The wrap-round template of a mitred or lobster-back bend's segment | |
| Reducer | A concentric or eccentric reducer developed flat | |
| Louver | A row of louvers: lances and forming outlines | |
| Part Mark | Numbered part marks on the Etch layer |
The production tools (Registration Mark, Drill Hole) are offered for every industry.
Outlines go on the Cut layer, bend lines on the Crease layer, and notes on the Dimension layer. Seams' and hems' allowances (Pittsburgh lock, snap lock, slip and drive, standing seam) are added on an edge, with their corner notches, by the Seam and Hem tool. A segmented round elbow's gores are drawn flat, all of them laid out ready to cut, by the Elbow Gores tool (or one at a time as wrap-round templates by the Mitre Segment tool); reducers by the Reducer tool, and rectangle-to-round transitions by the Rectangle to Round tool. For a round branch on a round duct, the Pipe Saddle tool draws the branch's wrap-round template.
Fitting schedule
File › Reports… › Duct fitting schedule lists each fitting (draw each on a page of its own) with its size,
the galvanised steel gauge its size and pressure class call for, its developed area and weight, and the weight at
the drawing's own thickness T, flagging a fitting drawn thinner than its gauge. A rectangular duct's gauge
goes by its largest side at ½, 1 or 2 in. w.g. (the low-pressure table after the SMACNA HVAC Duct Construction
Standards, as mechanical codes reproduce it), a round one's by its diameter (the minimums of common
specifications), a transition's the heavier of the two; round fittings can be taken one gauge heavier. The size is
the classification's (width, depth, diameter, in mm), else the Rectangle to Round
or Elbow Gores tool's, else the library design's labelled sizes. These are minimums
for unreinforced duct: check them against the edition, reinforcement and joints you build to. Name a one-page
drawing's fitting with CLASSIFY "fitting","Shoe take-off" (on several pages, each is named after its page) and
give how many with CLASSIFY "quantity","4".
File › Export › Export… also writes a fitting's pattern as a DXF with bend data for the press brake and folder, and the fitting folded up as a STEP solid.
Designs in the library
File › Run Parametric… has a HVAC folder (see Run Parametric):
| Design | What it is |
|---|---|
| Rectangular duct | A straight rectangular duct section from one sheet, with its seam |
| Rectangular radius elbow | The cheeks and wrappers of a rectangular bend |
| Rectangular offset | An ogee (S-bend) moving a duct sideways |
| Rectangular transition | A rectangular reducer, concentric or offset |
| Square to round transition | A rectangular-to-round transition in one piece (also drawn by the Rectangle to Round tool) |
| Concentric reducer | A cone frustum developed flat |
| Eccentric reducer | A round reducer flat on one side |
| Segmented round elbow | The gores of a round elbow (also drawn by the Elbow Gores tool) |
| Lateral branch | A branch joining a main at an angle |
| Shoe take-off | A 45° shoe tap for a branch off a rectangular main |
| Dovetail spigot collar | A round spigot collar for a take-off |
| Round end cap | A disc and band to close a round duct |
| Rain cap cone | A shallow cone held above a flue's end |
On a 3D page the fittings are shown made: the round ones rolled and put together (the segmented elbow's gores into the elbow, the end cap's band round its disc, the rain cap's cone with its strap under it, down the duct), and the rectangular elbow, offset and shoe take-off lying on one cheek with their wraps, heel and toe standing on it (the other cheek, the same, left off to show inside). See Wrapping and sweeping.
Machine profiles
Make It (File › Export › Make It, Ctrl+Shift+M, or the Make It button at the top of the window) writes the DXF for the plasma table (Plasma nesting software (DXF)) and the Duct fitting schedule as CSV in one click, beside the drawing, after checking the design: see Make It.
File › Export › Export… lists this trade's formats first. File › Send Using Machine Profile sends the drawing to a machine in one click, with the format, options, layer names and pens it needs; those that come with the app for this trade: Plasma nesting software (DXF), Plasma table (G-code, arc lead-ins). See Export by Industry and Machine Profiles.
See also: Industries and Tool Sets, Tools.