What it does
What you get
- FCU-Duct-Sizer-v1.html, a single file that works offline
- Method note (PDF): equations, roughness values, velocity tables, standards referenced
- Worked example: a typical FCU with a 1.2 m linear slot
- Primavo software licence and your licence key
(see the comment in this file for the image tag)
Runs in Chrome, Edge, Firefox and Safari. No install, no account, no data leaves your machine.
Licence
Pricing
Perpetual licence for the version purchased; minor updates free. Prices exclude VAT. Payment and delivery are handled by Gumroad; the download includes the tool, the method note, a worked example and the licence.
Single user
- One named user, up to two devices
- Perpetual licence for this version
- Method note and worked example
- Email support for installation and use
Company
- Up to five named users in one organisation
- Perpetual licence for this version
- Method note and worked example
- Priority email support; extra seats on request
Sold under the Primavo software licence. Liability is limited to the price paid. Calculation aid for competent engineers; it does not replace design responsibility.
Questions
Before you buy
Does it replace manufacturer selection software?
No. It gives you the duct and grille sizes to take into the manufacturer's tool with confidence; the manufacturer's data confirms throw and noise for the product you specify.
Can I change roughness and velocity limits?
Yes. Advanced view exposes every coefficient, and the defaults are listed in the method note with their sources.
What is the difference between the live version and the download?
The live version runs here for evaluation and may be updated or withdrawn at any time. The download is yours under a perpetual licence, works offline, and comes with the method note and worked example.
Does it work offline?
Yes. Open the HTML file in any modern browser. Nothing is sent anywhere.
What about updates?
Minor updates to version 1 are free to licence holders. A major version may be chargeable at a discount.