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Cleanroom Terminal Filtration
HEPA Terminal Box for Cleanroom Ceiling Air Supply
Biogreen HEPA terminal boxes form the final connection between a cleanroom air-supply duct and the room-side HEPA filtration point. Standard and gel-seal configurations are available for 500, 1000 and 1500 m³/h air volume, with top or side air inlet arrangements to suit different ceiling and duct layouts.
500–1500 m³/h
Rated Airflow
Top / Side
Air Inlet
Standard & Gel-Seal
Configurations
Model-Specific
Dimensions
500 / 1000 / 1500 m³/h
Rated Airflow
Top / Side
Air Inlet
90 / 220 mm
Standard Filter Depth
90 / 95 mm
Gel-Seal Filter Depth
430×430 to 785×785 mm
Diffuser Range
Standard / Gel-Seal
Configurations
Two HEPA Terminal Box Configurations for Different Cleanroom Requirements
Choose the terminal housing by filter sealing method, available ceiling space, duct direction and project testing requirements. Both product families are offered in 500, 1000 and 1500 m³/h rated airflow classes.
Standard HEPA Terminal Box
For conventional cleanroom terminal filtration using 90 mm or 220 mm filter depths. Side-inlet and top-inlet housings are available, with diffuser sizes from 430×430 mm to 740×740 mm.
Gel-Seal HEPA Terminal Box
For projects using a gel-seal filter-to-housing interface. The uploaded product structure includes dedicated DOP injection and sampling access, with 90 mm or 95 mm filter depths and diffuser sizes from 555×555×15 mm to 785×785×15 mm.
What Is a HEPA Terminal Box?
A HEPA terminal box is the final air-supply assembly installed between a cleanroom HVAC duct and the controlled room. The housing creates a stable plenum for the HEPA filter, provides the filter-to-box sealing interface and supports the room-side diffuser. Conditioned air enters the terminal filter box from the top or side, passes through the selected HEPA filter and is then distributed into the cleanroom through the diffuser plate. Because airflow, filter size, housing depth, duct connection and ceiling opening work as one system, they should be selected together rather than treated as separate components.
Inside the HEPA Filter Terminal Box
The terminal assembly is built around four coordinated components: the room-side diffuser, the selected HEPA filter, the terminal housing and the airflow regulating damper. The gel-seal version adds a filter sealing interface designed for the corresponding gel-seal filter configuration.
01 Diffuser Plate
Distributes filtered supply air into the cleanroom and completes the room-side ceiling finish.
02 HEPA Filter
Selected by filter dimensions, depth, sealing method and project requirement.
03 Terminal Housing
Connects the branch duct to the final filter and provides the structural plenum.
04 Regulating Damper
Supports terminal airflow adjustment during balancing where included in the selected configuration.
Select the HEPA Terminal Box by Rated Airflow
Start with the project design airflow, then verify filter size, housing dimensions, duct connection and diffuser size against the ceiling layout.
500 m³/h
Compact terminal class for smaller supply points. Standard filter sizes include 320×320 mm; gel-seal filter sizes include 400×400 mm.
1000 m³/h
Mid-range terminal class for general cleanroom supply points. Standard filter size: 484×484 mm. Gel-seal filter size: 550×550 mm.
1500 m³/h
Higher-airflow terminal class for larger supply points. Standard and gel-seal product families both include 630×630 mm filter-size options.
Standard HEPA Terminal Box Configurations
The standard product family supports both frameless and separator-style HEPA filter assemblies shown in the manufacturer reference. Side-inlet and top-inlet housings can be selected according to duct routing and available ceiling void, while 90 mm and 220 mm filter-depth series provide two housing-depth groups.
Frameless HEPA Configuration
A compact filter format paired with the corresponding terminal housing, diffuser and regulating damper.
90 mm series
Separator HEPA Configuration
A deeper filter configuration paired with the corresponding deeper terminal housing and matching diffuser arrangement.
220 mm series
Standard HEPA Terminal Box Models & Dimensions
Use the table below to match rated airflow with side-inlet or top-inlet housing dimensions, filter size, duct size and room-side diffuser size.
Side-Inlet Model
Top-Inlet Model
Side-Inlet Box Size (mm)
Top-Inlet Box Size (mm)
HEPA Filter Size (mm)
Duct Size (mm)
Diffuser Size (mm)
Rated Airflow (m³/h)
GK-5A
GK-5B
360×360×375
360×360×310
320×320×90
200×200
430×430
500
GK-10A
GK-10B
530×530×375
530×530×310
484×484×90
320×200
600×600
1000
GK-15A
GK-15B
670×670×375
670×670×310
630×630×90
Top 320×250 / Side 400×200
740×740
1500
GK-II 5A
GK-II 5B
360×360×490
360×360×450
320×320×220
200×200
430×430
500
GK-II 10A
GK-II 10B
530×530×490
530×530×450
484×484×220
320×200
600×600
1000
GK-II 15A
GK-II 15B
670×670×490
670×670×450
630×630×220
Top 320×250 / Side 400×200
740×740
1500
Model selection note: Choose the terminal box according to design airflow, filter dimensions, available ceiling void, duct direction and diffuser size. Confirm the final ceiling opening and duct connection against the approved HVAC drawing before production.
Gel-Seal HEPA Terminal Box for Controlled Terminal Filtration
The gel-seal HEPA terminal box uses a matching gel-seal filter interface and a compact housing format for cleanroom terminal air supply. The uploaded product structure shows side-inlet and top-inlet arrangements together with DOP injection and DOP sampling access for the corresponding test configuration. Filter-depth options shown in the product data are 90 mm and 95 mm.
- Gel-Seal Filter Interface
- Side or Top Air Inlet
- DOP Injection Access Shown in Product Structure
- DOP Sampling Access Shown in Product Structure
- 500 / 1000 / 1500 m³/h
Gel-Seal HEPA Terminal Box Models & Dimensions
The gel-seal series is grouped by rated airflow, filter depth and inlet orientation. Use the exact manufacturer dimensions below when preparing a project selection or drawing review.
Side-Inlet Model
Top-Inlet Model
Box Size (mm)
Filter Size (mm)
Diffuser Size (mm)
Damper Size (mm)
Rated Airflow (m³/h)
GK-5A
GK-511A
490×490×280
400×400×90
555×555×15
200×200×190
500
GK-10A
GK-1011A
640×640×280
550×550×90
705×705×15
320×200×190
1000
GK-10A
GK-1511A
720×720×280
630×630×90
785×785×15
320×250×190
1500
GK-20A
GK-2011A
490×490×280
400×400×95
555×555×15
200×200×190
500
GK-22A
GK-2211A
640×640×280
550×550×95
705×705×15
320×200×190
1000
GK-30A
GK-3011A
720×720×280
630×630×95
785×785×15
320×250×190
1500
Source-data note: The 1500 m³/h row with 630×630×90 mm filter size is shown as side-inlet model GK-10A and top-inlet model GK-1511A in the supplied manufacturer sheet. The UI must reproduce the source value exactly until the manufacturer confirms otherwise.
Top-Inlet vs Side-Inlet HEPA Terminal Box
The air-inlet direction affects terminal-box depth, duct routing and the ceiling-space required above the cleanroom.
Top-Inlet HEPA Terminal Box
The branch duct connects vertically above the terminal housing. Use this layout when the ceiling void allows direct duct access from above and vertical clearance is available.
Side-Inlet HEPA Terminal Box
The branch duct enters horizontally from the side of the housing. This arrangement is useful where ducts run parallel to the cleanroom ceiling or where vertical installation depth is restricted.
How to Select a HEPA Terminal Box
Send the five key inputs below and the closest standard model can be checked before a custom configuration is considered.
01 AIRFLOW
Confirm the required air volume: 500 / 1000 / 1500 m³/h or project-specific.
02 FILTER
Confirm filter size, depth and sealing method.
03 AIR INLET
Choose top or side inlet according to duct routing.
04 CEILING
Confirm ceiling opening and available ceiling void.
05 TESTING
Confirm damper and test-access requirements before fabrication.
HEPA Terminal Box FAQ
A HEPA terminal box is the final air-supply housing that connects a cleanroom branch duct to the HEPA filter and room-side diffuser.
A HEPA terminal box normally receives conditioned air from a centralized HVAC or AHU system. An FFU contains its own fan and filter and can move air independently.
The supplied product data includes 500, 1000 and 1500 m³/h rated airflow classes for both the standard and gel-seal product families.
Choose the inlet direction according to duct routing and available ceiling void. Top inlet uses vertical duct access above the housing; side inlet supports horizontal duct routing.
The standard terminal-box data includes 90 mm and 220 mm filter depths. The gel-seal product data includes 90 mm and 95 mm filter depths.
The supplied gel-seal product structure shows DOP injection and DOP sampling access. Final test requirements should be confirmed for the specific project before fabrication.
Yes. Use the corresponding model row to check housing, filter, duct or damper, diffuser and rated airflow dimensions before confirming the project drawing.
Provide rated airflow, product family, filter size, inlet direction, duct size, ceiling opening, quantity and any testing or drawing requirements.
Send Us Your HEPA Terminal Box Requirements
Not sure which model fits your cleanroom? Send the required airflow, filter size, duct direction and ceiling information. Biogreen can compare the inputs with the standard model ranges and prepare the corresponding technical configuration for review.
- Model matching based on supplied dimensions
- Drawing review before final production
- Standard and gel-seal configurations available
