Cleanroom Equipment
Laminar Flow Pass Box
Product Overview
A laminar flow pass box maintains vertical unidirectional flow inside the chamber. Rather than blowing only during transfer, it holds a clean environment for as long as an item remains inside. It suits material that has to wait in the pass box, or items that are highly sensitive to contamination.
Sizes are made to the opening and the load: the external dimensions follow from the clear internal size, adding 200mm to width, 70mm to depth and 500mm to height — the extra height being the fan and filter module on top.
Features & Specifications
►**Airflow**: vertical unidirectional flow inside the chamber, continuously running
►**External size derivation**: W2＝(W＋200), D2＝(D＋70), H2＝(H＋500)
►**Interlock**: electrical interlock
►**Enclosure material**: powder-coated cold-rolled steel; full stainless steel optional
►**Options**: UV germicidal lamp, differential pressure gauge, DOP test port
►**Custom sizes**: internal size set by the load, external frame matched to the opening
Detailed Description
The difference from a blow pass box is the word "continuous"
A blow pass box runs its nozzles for a set period as an item enters, knocking particles off the surface, and then stops. A laminar unit holds unidirectional flow in the chamber, so as long as the equipment is running the interior stays clean. The difference shows up during the time an item sits inside. Material placed in a pass box is not always collected immediately from the other side — the receiver may be busy, or a handover may be pending. In a blow type the chamber is simply a sealed box during that wait and settling contamination accumulates; a laminar type keeps carrying it away. So the test is straightforward: **will items dwell inside the pass box?** For immediate hand-over the blow type is enough; where material waits, use laminar flow.Allow 500mm of height for the fan module
In the sizing formula the 500mm added to height is far more than the 200mm on width and 70mm on depth, because it is the space taken by the fan and filter module above the chamber. This is easy to get wrong when cutting the wall opening: a 600mm-high usable chamber needs an opening of around 1100mm. Build that height into the design stage; discovering on delivery that the opening is too low, with the partition already finished, is an expensive correction.Selection References
Before ordering, verify the efficiency grade, media type, and whether the operating environment fits your requirements.
