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Makeup Air Unit Size Calculator
Makeup air airflow to replace exhaust air.
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Makeup air
Compare Your Options And Get Clear Answers
Makeup air airflow to replace exhaust air.
Makeup Air Unit Size Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: Makeup air = exhaust x share
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Makeup Quick Guide
Typical values for reference.
| Exhaust airflow (CFM) | Makeup air share (%) | Spare | Makeup air |
|---|---|---|---|
| 1200 | 90 | 0 | 1,080 CFM |
| 4000 | 100 | 0 | 4,000 CFM |
| 600 | 80 | 0 | 480 CFM |
| 2200 | 90 | 0 | 1,980 CFM |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Makeup Air Unit Calculator FAQ
Answers to common questions about this calculator.
It uses the formula shown with your inputs. Real conditions vary, so treat it as a guide.
Makeup air = exhaust x share
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.
Yes. Replace each input with your own figures and the result updates instantly.