CFM to CIH [ Cubic Inches per Hour ] Calculator
🔄 CFM ↔ CIH Converter
Contents
Conversion Formulas:
- 1 CFM = 103,680 CIH
- 1 CIH = 0.000009645 CFM
This conversion accounts for:
- 1 cubic foot = 1,728 cubic inches
- 1 hour = 60 minutes
- 1,728 × 60 = 103,680 cubic inches per hour per CFM
| CFM | CIH |
|---|---|
| 0 | 0 |
| 1 | 103,680 |
| 10 | 1,036,800 |
| 100 | 10,368,000 |
| 1000 | 103,680,000 |
For example, an HVAC technician is checking the air circulation in a big warehouse. The ventilation system measures airflow in CFM (Cubic Feet per Minute), but the air filter manufacturer lists it in CIH (Cubic Inches per Hour).
The technician need to convert CFM to CIH. This helps him match the right airflow with the filters and keep the system run in a smooth way. How to figure it out? see the conversion example.
How To Convert CFM Value To CIH
A warehouse has an industrial fan that moves 25 CFM of air. As one Cubic Foot contains 1,728 Cubic Inches, and there are 60 minutes in an hour, we use the conversion factor:
Use conversion formula:
For 25 CFM:
So, the fan moves 2,592,000 cubic inches of air per hour.
Air Filter Compatibility Checking
The air filter manufacturer says their filters can handle 2,500,000 CIH before need a replacement. But our system moves 2,592,000 CIH.
That means:
✅ The current filter won’t last as long as expected and might need an upgrade to keep up with the airflow.