Description
Static PTB
Is ideal when ventilation is not required inside the PTB. For example between two cleanrooms. It’s mainly used for non-sensitive, fast moving products.
Semi active PTB
Is recommended when building a new cleanroom because it offers flexibility. It can be used between cleanrooms and non-validated environments thanks to a HEPA-filter that removes 99.97% of contamination, and it can also help to achieve a higher cleanroom certification.
Dynamic PTB – Internally recirculated filtration (Closed loop)
Is often the better option for an existing cleanroom, this with regard to the already present integrated equipment and AHU.
Dynamic PTB use a closed loop system to continuously recirculate air in the chamber through built-in HEPA or ULPA filters. These clean air Dynamic PTB are self-contained and do not require any ventilation or exhaust ducting. They run continuously to reduce particle concentration within the chamber. This design is commonly used because the closed-loop system does not impact adjacent room pressure balances when operating.
