HVAC-Integrated VHP System

Integrates a hydrogen peroxide generator with the HVAC system, using its airflow circulation to distribute VHP vapor through the space and ductwork for room- and surface-level bio-decontamination. Available in standard 1,000 m³ and 2,000 m³ models, with larger volumes available on request.

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Fenggu HVAC-Integrated VHP System FG-VHP-C1000 / FG-VHP-C2000

Overview

The HVAC-Integrated VHP System integrates a hydrogen peroxide generator with the existing HVAC system. Using the HVAC airflow circulation, it distributes vaporized hydrogen peroxide (VHP) through the space to be treated and the associated ductwork. VHP vapor's oxidizing action acts on the cell membranes, proteins and nucleic acid structures of microorganisms; cycles can be developed and validated to a stated log-reduction target against a specified biological indicator, with actual performance subject to project-specific validation. After the cycle, residual hydrogen peroxide decomposes into water and oxygen. The system consists of a rotary dehumidifier, HEPA filters, a high-pressure blower, CPVC tubing and a VHP vaporization unit, with major components sourced from internationally recognized brands. It is currently available in three standard capacities — 1,000/2,000/3,000 m³ — with larger volumes available on request.

Bio-decontamination Process

Preparation and dehumidification — the operator switches the HVAC control panel to VHP mode; the system automatically prepares and self-checks the generator, valves and sensors; the HVAC system dehumidifies, bringing the target space to a temperature above 25°C and humidity below 50%
Conditioning — once temperature and humidity are within range, the HVAC system signals the start of the cycle; VHP vapor is distributed through the ductwork to each room in the target area and brought up to the target concentration
Bio-decontamination (hold) — the generator continuously replenishes VHP, holding concentration at the target level as vapor continues circulating through the area, supporting coverage of duct interiors, room corners, equipment surfaces and other complex areas
Aeration — VHP injection stops, the HVAC system switches to aeration mode, the VHP tubing valve closes, and fresh-air/exhaust dampers open to introduce fresh air and purge residual vapor until the concentration falls below 1 ppm
Return to production — the HVAC system switches back to normal production mode; where multiple areas exist, each can be treated in sequence under automated control

Core Components & Technical Features

Hydrogen peroxide vaporization unit: flash-vaporization technology rapidly vaporizes a 30–35% hydrogen peroxide solution, distributing it through HVAC ductwork and past HEPA filters; multiple vaporization units can be configured according to the size of the space
HVAC integration: connects directly to the existing HVAC ductwork without major renovation, injecting VHP vapor into the main supply duct via CPVC tubing
Intelligent control and monitoring: 12-inch industrial touchscreen with real-time monitoring of cycle time, temperature, humidity and hydrogen peroxide concentration; control-system data logging can be configured to support FDA 21 CFR Part 11 electronic-record requirements
Available in standard 1,000 m³ and 2,000 m³ models, with 3,000 m³ and larger volumes available on request; large-area treatment cycles typically complete in 3–8 hours; dry-cycle process designed for low corrosion risk and good material compatibility under controlled conditions, with full-process automation

Technical Specifications

Process temperature	25–35°C	Process humidity	<50%
VHP concentration	150–300 ppm	Residual VHP after aeration	≤1 ppm
Exterior / piping material	SUS304 / SUS316L	Delivery piping	CPVC
Noise level	≤75 dB(A)	Sporicidal efficacy	≥6-log reduction (subject to validation)

Capacity Comparison

Parameter	1,000 m³ Model (FG-VHP-C1000)	2,000 m³ Model (FG-VHP-C2000)
External dimensions (L×W×H)	1,800×600×1,900 mm	2,400×600×1,900 mm
Full cycle time	<180 min	<240 min
Aeration time	≤1 h	≤1.5 h

Mobile VHP Unit vs. HVAC-Integrated VHP System

Comparison	Integrated (HVAC-linked)	Mobile Unit
VHP delivery	Circulated via HVAC, delivered through pre-installed CPVC tubing to the target area	Manually wheeled to the target area, VHP released by its own diffusion system
Uniformity	Delivered to every room via the HVAC system, which is designed to give even distribution without excessive local concentration	May require auxiliary fans; diffusion can be less even in spaces with many rooms/doors, and supply/return ducts can be harder to reach with a single unit
Cycle time	Effective run time <120 min	Effective run time >120 min
Treatment volume	Up to 5,000 m³ per unit	Typically up to 300 m³ per unit
Panel corrosion risk	Dry cycle with HVAC-controlled temperature/humidity, designed to limit condensation and associated corrosion risk to nearby cleanroom panels	Humidity rises during the cycle and condensation is more likely, which can increase corrosion risk to panels near the unit
Reproducibility	Cycle parameters (airflow, valve states) can be fixed, supporting consistent cycle-to-cycle performance	Placement, weather and season can introduce more cycle-to-cycle variation
Labor requirement	Automated, unattended operation; HVAC returns to production mode after the cycle	Requires manual placement, per-unit dosing checks and removal after the cycle, with manual HVAC switchover
Operating location	Started from the HVAC control room	Started at each unit inside the target area; placement should be kept consistent
Convenience	Serving more than 2 spaces typically only requires switching valves	Limited units must be moved to the next space in sequence
Scalability	New facility areas can share the system by extending VHP injection tubing	New facility areas can share the unit, but it must be moved manually
Upfront investment	Higher	Lower