Support
HVAC Duct Design
For help, purchase questions, bug reports, or privacy requests, email [email protected] with “HVAC Duct Design” in the subject. Include the app version, your device model, and a description of the issue. Share job details only if you want to.
To size a duct, open the Size tab, enter an airflow, and choose whether to size by friction rate or velocity. Results update as you type. Switch to Rectangular to see matching standard sizes; lock a height or width if space limits one dimension, and tap a row to make it the headline size.
To total a run, tap Build a run on the Size tab, add a section for each stretch of duct, and add fittings. Each section shows its pressure drop, the footer shows the running total, and with more than one section it shows the critical path. Save a run as a job to keep it. Reference values and fitting lengths are estimates; the Reference tab names the source of each table.
Jobs are stored only on your device. Swipe a job to delete, rename, or duplicate it, or press and hold to share a plain-text summary. Deleting a job or the app cannot be undone, and we cannot recover local data from a server. Change units and defaults in Settings.
HVAC Duct Design is a one-time lifetime purchase, not a subscription. If it is not recognized after reinstalling or changing devices, tap Restore Purchases in Settings or on the paywall while signed in to the Apple Account used to buy it. For billing or refund questions, contact Apple at https://support.apple.com/billing.