Air change is the amount of air required to completely replace the air in a defined space within a factory. Fresh air from the outdoor is cleaner in general and have more oxygen then the air within the factory. The rate of air change depends on the type of production process, factory which is highly heated, strong solvent or chemical smell may require a higher air change rate.
Air change rate is a unit of measurement of the amount of air moving through a defined space to the volume of the space in a specific time.
It is expressed as:Air Change per Hour = Total Fresh Air Supplied (m3) per Hour / Volume of Workspace (m3)
Volume of Workspace = Length x Width x Height of the space
Air Change Rate determine how well a workspace is ventilated
The table below shows the recommended air change for various types of work processes.
Recommended Design Air At 4 m Height
|Workspace||Heat generation from process (little)||Heat generation from process (medium)||Heat generation from process (high)||Air Change Rate|
|Platic Injection Molding||●||●||30 ~ 40|
|Plastic bags & Film Manufacturing||●||40|
|Plastic Extrusion & Pultrusion||●||30|
|Plastic Label Printing||●||●||30 ~ 40|
|Rubber Label, Molding, Calendering||●||40|
|Metal Machining, Milling, Pressing||●||25|
|Metal Electro-plating||●||●||30 ~ 40|
|Metal Welding||●||●||30 ~ 40|
|Metal Forming||●||●||25 ~ 30|
|Spraying||●||●||30 ~ 40|
|Food Cooking, Steaming||●||40|
|Food Packing, Canning||●||30|
|Assembly & Sorting Line||●||30|
2. Criteria established here are based on Waterline's experience and subject to change with new findings.
3. Please refer to Waterline's sales for other areas not specified above.