Duct size
Quickly reference duct sizing relationships when working with HVAC supply ducts, return ducts, branch runs, and trunk lines.
HVAC duct sizing app for iOS
The clean, modern ductulator built for real HVAC work.
PT Ductulator is an HVAC duct sizing calculator app for iPhone and iPad. Use it as a digital ductulator to size round ducts, compare airflow, check velocity, and reference friction rate while working on installs, service calls, duct design, airflow complaints, and HVAC training.
Download on the App Store
Available for iPhone and iPad on the Apple App Store.
See what it does Need tech support?📏 Duct sizing
💨 Airflow checks
📉 Friction rate
⚡ Velocity feedback
📱 iPhone & iPad
Digital Ductulator
What is a ductulator?
A ductulator is a duct sizing calculator used in HVAC to compare airflow, duct size, friction rate, and air velocity. PT Ductulator turns that familiar duct sizing process into a clean iPhone and iPad app for technicians, installers, designers, and students.
Airflow and CFM
Use airflow values to understand how much air a duct is expected to move and whether the duct size makes sense.
Velocity and friction
Compare velocity and friction rate so duct sizing decisions are easier to explain and easier to verify.
Features
Everything a ductulator should be: fast, clear, and easy to read.
PT Ductulator focuses on the calculations HVAC pros actually need when working with duct size, airflow, friction, and velocity. The App Store listing describes it as a simple modern duct sizing tool with clean inputs and instant results for real HVAC work.
Size ducts quickly
Use PT Ductulator when you need a fast duct sizing reference for service calls, replacements, installs, remodels, or layout conversations.
Check airflow and velocity
See airflow and velocity relationships clearly so you can explain duct performance without digging through charts or old-school wheels.
Use friction feedback
Quickly compare duct sizing decisions against friction and velocity so you can avoid obvious comfort and static-pressure problems.
Why it matters
Duct sizing affects comfort, airflow, noise, and system performance.
Ductwork is not just sheet metal or flex. It controls how much air actually reaches the space. A quick duct calculator helps technicians catch undersized ducts, high velocity, airflow restrictions, and design choices that can create comfort complaints.
For field technicians
- Double-check duct sizes during service calls.
- Support airflow conversations with homeowners and builders.
- Verify whether a branch, return, or trunk line looks reasonable.
- Teach apprentices how CFM, friction, velocity, and duct size connect.
For designers, installers, and students
- Make faster duct sizing decisions during layout planning.
- Compare airflow and duct size without a cluttered interface.
- Use a simple digital ductulator from an iPhone or iPad.
- Keep a duct sizing calculator available anywhere you work.
Use cases
Built for rooftops, attics, shops, classrooms, and design desks.
Whether you are installing ductwork, checking an airflow complaint, or teaching a new tech, PT Ductulator gives you a quick way to look at duct sizing without dragging out a manual chart.
Service call
Check whether existing ducts are obviously undersized or likely to create high velocity and comfort complaints.
Check whether existing ducts are obviously undersized or likely to create high velocity and comfort complaints.
Install planning
Use fast duct sizing feedback while discussing branch runs, return sizing, and airflow requirements.
Use fast duct sizing feedback while discussing branch runs, return sizing, and airflow requirements.
Apprentice training
Show how changing CFM or duct size changes velocity and friction, making airflow easier to understand.
Show how changing CFM or duct size changes velocity and friction, making airflow easier to understand.
Customer explanation
Use clear numbers to explain why duct changes may be needed instead of relying on vague comfort language.
Use clear numbers to explain why duct changes may be needed instead of relying on vague comfort language.
Download PT Ductulator
Put a clean HVAC duct calculator in your pocket.
PT Ductulator is available on the App Store for iPhone and iPad. Use it to size ducts, check airflow, and make faster ductwork decisions in the field.
FAQ
PT Ductulator questions
Quick answers for HVAC technicians, installers, designers, and students looking for a modern duct sizing calculator app.
What is PT Ductulator?
PT Ductulator is a duct sizing calculator app for HVAC work. It is designed to help users size ducts, check airflow, and see friction and velocity quickly from an iPhone or iPad.
Who should use PT Ductulator?
PT Ductulator is useful for HVAC technicians, installers, designers, contractors, instructors, and students who work with airflow, duct sizing, comfort problems, or system design.
Is PT Ductulator only for experienced HVAC techs?
No. It is useful for experienced technicians, but it can also help apprentices and students understand how duct size, CFM, velocity, and friction relate to each other.
Can I use PT Ductulator in the field?
Yes. The app is designed around fast, readable inputs and results, making it useful on rooftops, in attics, in mechanical rooms, and during job planning.
Does PT Ductulator replace proper HVAC design?
No. PT Ductulator is a field and reference tool. Always verify final designs against applicable codes, standards, manufacturer requirements, and the full project conditions.