Concealed Fresh Air / Recirculation Unit with Filtration

Product Overview

Usha Filters Concealed Fresh Air / Recirculation Unit with Filtration is a compact, ceiling-mounted air handling solution designed to provide clean, filtered air for commercial, healthcare, pharmaceutical, and industrial applications. The unit can be configured for 100% Fresh Air, Recirculated Air, or a Fresh Air + Return Air Mix, depending on project requirements.
Designed for concealed installation above false ceilings, the unit incorporates multi-stage filtration, energy-efficient fan systems, and optional cooling/heating arrangements to deliver conditioned and filtered air while maintaining aesthetic interior spaces.

Key Features

• Concealed ceiling-mounted design
• Suitable for Fresh Air, Recirculation, or Mixed Air applications
• Multi-stage filtration system
• Compact and space-saving construction
• Low noise operation
• Energy-efficient EC or AC motor options
• Easy maintenance access
• High airflow performance
• Optional HEPA filtration for cleanroom applications
• Optional cooling and heating coil integration
• Available with BMS-compatible controls
• Custom-built to project requirements

Construction Details

Technical Specifications

Working Principle

The unit draws fresh air, recirculated air, or a combination of both through a multi-stage filtration system. Air first passes through a pre-filter to remove larger dust particles, followed by fine filtration stages for improved air quality. For critical applications, HEPA filtration can be incorporated as a final stage.
Filtered air is then supplied through the fan section into the conditioned space. Optional cooling or heating coils can be integrated to control temperature and humidity as required.

Applications

• Commercial Buildings
• Office Spaces
• Pharmaceutical Facilities
• Hospitals and Healthcare Areas
• Laboratories
• Cleanrooms
• Food Processing Facilities
•  Hotels and Hospitality Buildings
• Educational Institutions
• Electronics Manufacturing Facilities
• Industrial Process Areas
• Data Centers and Technical Rooms

Advantages

• Improved Indoor Air Quality
• Space Saving Design
• Flexible Air Handling
• Energy Efficient Operation
• Customizable Configuration

Maintenance Guidelines

•  Inspect and clean pre-filters regularly.
•  Replace fine filters based on pressure drop and operating conditions.
•  Monitor airflow performance periodically.
•  Clean fan assemblies and drain trays during maintenance.
•  Inspect insulation and access panels for integrity.
•  Replace HEPA filters as per recommended pressure drop limits where applicable.

Customization Options

Usha Filters offers customized Concealed Fresh Air / Recirculation Units based on:

•  Airflow capacity (CMH)
•  Fresh air, recirculation, or mixed-air configuration
•  Filtration efficiency requirements
•  HEPA filtration option
•  EC or AC fan selection
•  Cooling and heating coil integration
•  Housing material (GI Powder Coated, Aluminium, SS 304)
•  Static pressure requirements
•  BMS and control system integration
•  Project-specific dimensions and installation constraints

Optional Accessories

•  Differential Pressure Gauges / Magnehelic Gauges
•  Filter Clogging Indicators
•  VFD / EC Motor Controllers
•  Temperature & Humidity Sensors
•  UV-C Disinfection System
•  BMS Communication Module
•  Sound Attenuators
•  Flexible Duct Connections
•  Motorized Dampers

Typical Applications by Configuration

• Fresh Air Unit (FAU):
• Provides 100% filtered outdoor air for ventilation and pressurization requirements.
• Recirculation Unit (RCU):
• Continuously filters and recirculates room air to maintain cleanliness and reduce energy consumption.
• Fresh Air + Recirculation Unit (FAHU):
• Combines outdoor air and return air to achieve optimum indoor air quality and energy efficiency.