NPD Static Pass Box
Model: NPD-233-SPB | Cleanroom Material Transfer Hatch
The NPD Static Pass Box is a wall-mounted, stainless-steel transfer hatch engineered for moving materials, tools and samples into and out of cleanrooms while minimising direct air exchange. Its electromagnetic door interlock ensures the two doors cannot open simultaneously, supporting controlled material transfer without repeatedly opening the main cleanroom door.
NPD SPB-11 (SS)NPD SPB-22 (SS)NPD SPB-23 (SS)
Custom chamber dimensions and interlocking configurations can be discussed according to your cleanroom requirements.
Controlled Material Transfer for Cleanrooms
The NPD-233-SPB is a sealed, non-ventilated pass-through chamber installed in the wall between a cleanroom and an adjacent area. It allows operators to transfer documents, equipment, samples and other items without disturbing routine cleanroom access. The rectangular SS 304 construction provides durability and smooth surfaces for easy cleaning.
Two hinged doors are positioned at opposite ends, each with a clear glass viewing window. When one door is open, the electromagnetic interlock holds the opposite door closed to limit direct airflow exchange and support cleanroom cleanliness discipline.
Key Features & Benefits
A practical and hygienic solution for routine material transfer.
Interlocked Double Doors
Electromagnetic locking prevents simultaneous opening of both transfer doors.
Full SS 304 Construction
Durable stainless-steel surfaces support effective cleaning in controlled environments.
Clear Viewing Windows
Glass windows allow operators to check chamber contents before access.
Wall-Mounted Installation
Integrates between adjacent rooms for convenient pass-through handling.
Reduced Door Traffic
Minimises the need to open the main cleanroom door for routine materials.
Low-Maintenance Static Design
Simple non-ventilated operation with no fan or forced-air HEPA filtration system.
Technical Specifications
Model NPD-233-SPB — data based on the supplied product PDF.
| Parameter | Specification |
|---|---|
| Make | NPD |
| Model | NPD-233-SPB |
| Product Type | Static Pass Box |
| Construction Material | Stainless Steel SS 304 |
| Configuration | Rectangular chamber with two doors at opposite ends |
| Door Type | Hinged doors with glass viewing windows |
| Door Interlocking | Electromagnetic — only one door may be opened at a time |
| Installation | Wall-mounted between cleanroom and adjacent room |
| Airflow | Static design; no forced-air filtration system |
| Purpose | Controlled material transfer while limiting direct airflow exchange |
| Applications | Cleanrooms, pharmaceutical facilities, laboratories, hospitals, electronics and food-processing areas |
Chamber dimensions and interlocking options can be customised depending on the site and cleanroom requirements.
Available Models
Three standard SS 304 chamber sizes from the product PDF.
Compact solution for documents, small tools and sample containers.
Suitable for routine transfers of medium-sized items.
Extra depth for larger trays, equipment and packaged materials.
How the Static Pass Box Works
A simple four-stage transfer sequence with controlled door access.
Load Material
Open the accessible-side door and place the item within the chamber.
Close the First Door
Shut the loading door before accessing the opposite side.
Door Interlock
The electromagnetic interlock restricts simultaneous door opening.
Retrieve Material
Personnel on the other side can open the released door and collect the item.
Designed for Hygienic Daily Operation
Stainless-Steel Transfer Chamber
Built from SS 304 stainless steel, with smooth and corrosion-resistant surfaces suited to repeat cleaning and ongoing cleanroom operation. Hinged doors and inspection windows support simple material handling.
Choosing Static or Dynamic
Static pass boxes have no forced-air filtration. They are generally suited to areas of the same cleanliness classification. When transferring between different cleanliness classes, a dynamic pass box with HEPA-filtered airflow may be more appropriate, subject to facility requirements.
Applications & Industries
Static Pass Box FAQs
What is the purpose of a static pass box?
It enables controlled transfer of tools, documents, samples and materials through a wall-mounted hatch without repeatedly opening the main cleanroom door.
Does this Static Pass Box contain a HEPA blower?
No. This model uses a static, non-ventilated design with no forced-air filtration system. For filtered-air transfer, a dynamic pass box is the relevant product type.
How does the door interlock work?
The electromagnetic interlock prevents the two doors from being opened at the same time, helping limit uncontrolled air exchange between adjoining areas.
What material is the chamber made of?
It is constructed from SS 304 stainless steel for hygienic, durable and easy-to-clean operation.
Are custom sizes available?
Yes. The supplied specification states that custom chamber dimensions and alternative interlocking configurations can be provided according to requirements.
Need a Static Pass Box for Your Cleanroom?
Share your chamber dimensions, installation location and material-transfer requirements to discuss an appropriate model and quotation.