Three measurements are enough to size a system. Enter them below and the airflow requirement updates as you type.
This is the same starting figure our engineers use. It is an indicative sizing - a site survey still decides final placement, duct runs and discharge direction.
Send us these figures and we return a layout drawing with cooler positions marked.
Four steps, all of them arithmetic you can check yourself.
Length × width × height gives the cubic feet of air in the building, converted to cubic metres.
L × W × H × 0.0283
How many times that entire volume of air should be replaced every hour. It depends on what happens inside.
ACH by space type
Volume multiplied by air changes gives the total airflow the installation has to deliver, in CMH.
Volume × ACH = CMH
Total airflow divided by the rating of one cooler, rounded up so the requirement is always fully met.
CMH ÷ unit rating
The busier and hotter a space is, the faster its air has to be replaced. These are the figures the calculator uses.
| Type of space | Typical conditions | Air changes / hour |
|---|---|---|
| Industrial shed / factory floor | General manufacturing with moderate machine heat. | 30 |
| Warehouse / storage | Low heat load, mostly racking and movement. | 20 |
| Hot process area | Foundry, forging, furnace and heat-treatment bays. | 45 |
| Commercial hall / showroom | Assembly halls, banquet spaces and large retail floors. | 25 |
| Kitchen / canteen | Cooking heat plus steam needs faster extraction. | 40 |
| Poultry / livestock shed | Continuous ventilation for animal comfort. | 60 |
All four are settled during the site survey, which is why a final proposal can differ from the figure above.