STJH-MULTI-STAGE-HOUSING-DUAL-PRE-HEPA

Multi-Stage Air Filter Housing Three-Stage Dual-Prefilter and HEPA

A high-dust particle filtration train using two progressively finer prefilters ahead of the final HEPA.

2 in coarse first stage
12 in secondary filter
Final HEPA protection

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Product Introduction

This configuration dedicates all three stages to particles: a 2 in coarse panel, a 12 in secondary filter and a final HEPA. The progressive sequence is intended for outside-air systems with enough dust load to justify two protective stages before the expensive final filter. Unlike the molecular version, it does not include a gas adsorber; its benefit is longer HEPA life and more stable particle capture under heavy ambient loading.

Key Features

Progressive dust capture

Each upstream stage removes a different particle fraction before air reaches the HEPA.

Extended final-filter life

The secondary deep filter absorbs loading that would otherwise raise HEPA resistance prematurely.

Modular matched sections

Welded side-access housings align the three filters and allow separate service for each stage.

Technical Parameters

Number of Stages	3
First Stage	2 in coarse panel filter
Second Stage	12 in medium-efficiency filter
Final Stage	HEPA filter
Housing Construction	Fully welded metal
Access	Side access
Primary Duty	High-dust outside-air particle filtration
Stage Monitoring	Individual differential-pressure points
Configuration	Modular matched filter sections
Customization	Available based on the intended application and operating environment.

Applications

For cleanroom make-up systems and critical facility AHUs exposed to high outdoor dust, seasonal pollen or industrial particulate loading.

Solutions for Your Application

The secondary filter is too coarse to materially protect the HEPA.Select a progressive efficiency step that captures the dominant fine-dust fraction without exhausting the system pressure budget.

Maintenance changes all three stages at the same interval and wastes usable filters.Provide differential-pressure points across each section and replace stages according to their individual loading.

Available Options

Confirm outside-air dust profile, efficiency progression, filter depths, cabinet material, access side, pressure taps, test ports and spare strategy.

Planning a Multi-Stage Air Filter Housing Three-Stage Dual-Prefilter and HEPA specification?

Send us your dimensions, installation conditions, performance targets and required surface finish.

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