Latest company case about Guangzhou Cleanroom Construction Co., Ltd. Certifications

A Concise Comparison Guide Based on Product Specifications

Introduction

In cleanroom design, Fan Filter Units (FFUs) and HEPA Boxes are two common types of terminal air supply devices. Based on actual product specifications, this article provides a concise comparison and clear tables to help you quickly understand the differences between the two and make an appropriate choice based on your project requirements.

1. What Is an FFU?

An FFU is a modular filtration unit with an integrated fan that can be installed directly into the cleanroom ceiling grid without the need for external ductwork.

GCC Series FFU Core Specifications

FFU Key Features

✅ Integrated fan, no external ductwork required

✅ Stepless speed control for precise airflow adjustment

✅ Low vibration and low noise operation

✅ Suitable for ISO Class 5-8 cleanrooms

✅ Centralized control for multiple FFUs

✅ Modular design for flexible installation

2. What Is a HEPA Box?

A HEPA Box is a terminal filtration device that does not contain an integrated fan and requires connection to a central AHU with ducted air supply.

Powder Coated HEPA Air Supply Outlet Core Specifications

Mini-Pleated HEPA Filter Specifications

HEPA Filter with Clapboard Specifications

HEPA Box Key Features

✅ No built-in fan, relies on central AHU for air supply

✅ Room-side replaceable filter

✅ Welded structure for excellent airtightness

✅ Adjustable butterfly damper for airflow balancing

✅ Suitable for pharmaceutical, semiconductor GMP cleanrooms

✅ Optional vertical or horizontal airflow patterns

3. FFU vs HEPA Box: Core Differences Comparison

4. How to Choose?

Choose FFU When

Retrofit project with limited plenum space

Using modular cleanroom construction

Need independent zone control

Anticipating frequent layout changes

Cleanroom is small to medium in size

Choose HEPA Box When

New construction large cleanroom

Existing central AHU system available

Sufficient plenum height

Layout is long-term stable, no frequent changes

Energy efficiency is a priority (central fans are more efficient)

Hybrid Approach

Many projects adopt a FFU + Central AHU hybrid approach:

FFUs handle internal recirculation

Central AHU provides makeup air

Balances flexibility and energy efficiency

5. Summary

There is no absolute right or wrong—only what is suitable for your project.