1. In a clean room, whether it is a large air volume hepa filter installed at the end of the air handling unit or a hepa filter installed at hepa box, these must have accurate operating time records, cleanliness and air volume as a basis for replacement, if under normal use, the service life of the hepa filter can be more than one year, and if the front-end protection is good, the service life of the hepa filter can be more than two years.
2. For example, for hepa filters installed in clean room equipment or in air showers, if the front-end primary filter is well protected, the service life of the hepa filter can be as long as more than two years such as hepa filter on clean bench. We can replace hepa filter through the prompts of the pressure difference gauge on clean bench. The hepa filter on clean booth can determine the best time to replace hepa filter by detecting the air velocity of the hepa filter. The replacement of the hepa filter on fan filter unit is based on the prompts in PLC control system or the prompts on pressure difference gauge.
3. In air handling unit, when the pressure difference gauge shows that air filter resistance reaches 2 to 3 times of the initial resistance, maintenance should be stopped or the air filter should be replaced.
Post time: Apr-01-2024