Ductulator - HVAC Duct Sizing

Ductulator - HVAC Duct Sizing

welmurr·SGD 4.48
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Screenshots

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Description

The Duct Sizer App designed based on surveying the needs of engineers.
Units can be changed from Imperial to S.I

This is a much faster and versatile equivalent of the duct sizing charts provided by top HVAC manufacturers.

In Design Mode: Get a range of suitable duct sizes by inputting either the maximum friction rate or maximum velocity. The App will provide a list of suitable rectangular and circular ducts as well as resulting friction rates and velocities

In Sizing Mode: Just like a Ductulator, Adjust the duct dimensions and air flow rates, while checking the resulting friction rate and velocity which update automatically. The Sizing mode is typically used to analyze existing duct systems, and was added upon the request of users' feedback.

Calculations are based on standard air 0.075 lb/ft3 (1.2 kg/m3) in clean galvanized steel duct.

Any feedback is welcome, and will be the basis for future updates.

Developer

welmurr

Developer ID: welmurr

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Recent Reviews

Jmrat24

v1.5

It's good and easy. Really needs the ability to use odd numbers though. That would make it perfect. Edit: Thanks for the update and adding odd numbers. I'm using this app to train a few guys how to size duct and it works great! Best and simplest in the appstore!

29 May 2026

Jeremy Cook

v1.3.3

don't see any options for round flex. this is useless. I want a refund. maybe offer a trial version so people don't waste their money

4 May 2026

Richard G Wallen

v1.3.3

Better than my Trane ductulator - I used this for a year on the iPhone. I've since traded that in for a Samsung so bought it again. The features are a little different. One thing I miss is to be able to "size" vs design by switching from flex to rectangular or square duct. I use this to cross check my Manual D where I can see the friction loss across distribution boxes and triangles. are you considering a PC version?

17 Apr 2026

Alec Chapwesk

v1.3.2

It doesn't seem to allow you select round duct sizes.

12 Feb 2026

David Harden

this app is not what I was looking for.

20 Dec 2025

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