DuctLab: HVAC Duct Layout
Sheet metal layout & estimate
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Lay out transitions, square-to-rounds, offsets, and elbows. Estimate sheet material and export a fabrication PDF—offline, with no login or cloud upload.
DuctLab is an HVAC sheet-metal layout and estimating companion for fabricators, installers, technicians, apprentices, and contractors. Build a job, add fittings, enter real dimensions, and turn them into measurements, diagrams, fabrication steps, material totals, and a shareable PDF.
Private by design
• Offline — calculate layouts, review references, manage projects, estimate material, and create PDFs without an internet connection.
• No Login — start working with no account, email, password, or team workspace.
• Privacy First — customer names, job numbers, notes, dimensions, costs, and fabrication details stay under your control.
• On Device — storage, geometry calculations, diagrams, estimates, and PDF creation run on your iPhone.
• No Cloud Upload — DuctLab has no server or proprietary cloud-sync service and does not upload projects in the background.
Projects are saved locally with iOS file protection. PDFs leave only through a system share action you choose.
Four fabrication layouts
• Rectangular Transition: enter top and bottom openings, length, and horizontal or vertical offsets. Get centerline true length, four panel slopes, centerline angle, sheet area, and development steps.
• Square to Round: enter the rectangular opening, diameter, length, and offsets. Choose 8 to 48 divisions and see circumference, division spacing and angle, corner and side true lengths, area, and triangulated layout steps.
• Duct Offset: use width, height, rise, and run to calculate true travel, offset angle, travel per unit rise, sheet area, and a four-face development method.
• Elbow Layout: develop rectangular or round 45° and 90° elbows with a centerline radius and 1 to 12 segments. Review centerline, throat, and heel arcs, developed perimeter, angle per segment, area, and assembly steps.
Live shop results
The preview, dimensions, area, and key result update while you edit. Saved parts include a drawing, true lengths, slopes or angles, material, quantity totals, and ordered fabrication steps. Add seam allowance area or duplicate a part for a variation.
Material and cost estimating
DuctLab totals parts by quantity, adds waste, compares the result with stock-sheet dimensions, rounds up sheet count, and estimates cost in USD, CAD, AUD, EUR, or GBP. Imperial and Metric are supported; switching systems converts stored dimensions.
Organize projects
Record a customer, job number, and notes; add fittings and quantities; or duplicate a part or project to explore a revision while preserving the original.
On-device PDF export
Generate a multi-page package with job information, material estimates, and individual part pages containing specifications, quantity, seam allowance, diagram, measurements, totals, cautions, and numbered steps. Share, print, or save only when you choose.
Field references
Look up common duct sizes, 30 ga to 20 ga galvanized thicknesses, and typical Pittsburgh, snap-lock, grooved, cleat, and standing-seam allowances. Treat them as starting points, not project specifications.
Set default units, currency, waste, and sheet size for new projects. Imperial input accepts fractional inches. The interface follows supported iOS languages and links to Apple’s app language settings.
Important shop note
DuctLab is a calculation, estimating, and reference tool. Results depend on your inputs and may not match every machine, seam profile, material, standard, or code. Compound transitions can twist, tight square-to-round fittings may need more divisions, and shop conventions vary. Before cutting, verify dimensions, pattern points, allowances, gauges, quantities, costs, requirements, codes, and a full-size layout with qualified judgment.
Enjoy the full DuctLab experience with an active subscription, required to use the app.
Privacy Policy: https://woodcuttool.com/legal/DuctLab/privacy/
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Bug fixes and performance improvements.
The developer, 家宝 戴, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- 家宝 戴
- Size
- 2.9 MB
- Category
- Graphics & Design
- Compatibility
Requires iOS 17.6 or later.
- iPhone
Requires iOS 17.6 or later. - Mac
Requires macOS 14.6 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.3 or later.
- iPhone
- Languages
English and 14 more
- English, Arabic, French, German, Indonesian, Italian, Japanese, Korean, Portuguese, Russian, Simplified Chinese, Spanish, Thai, Traditional Chinese, Turkish
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- DuctLab Monthly $9.99
- DuctLab Yearly $49.99
- Copyright
- © 2025 JiaBao Dai. All rights reserved.