The VRF Indoor Unit range delivers the flexibility, efficiency, and precision that modern commercial and residential HVAC projects demand. Engineered for seamless compatibility with Foster Full DC Inverter Outdoor Units, every indoor unit in this range is optimised to work as part of a fully integrated Variable Refrigerant Flow system delivering precise, energy-efficient climate control across any number of independently controlled zones.
Whether the project calls for concealed slim duct units in luxury residences, high static pressure ducted units in large commercial floors, cassette units in open-plan offices, or wall-mounted units in boutique retail spaces, the Foster VRF Indoor Unit range provides a purpose-matched solution for every space, every ceiling type, and every architectural requirement.
All indoor units operate on DC inverter technology, continuously modulating refrigerant flow in response to real-time zone demand minimising energy waste, eliminating temperature fluctuations, and ensuring occupant comfort is maintained precisely and quietly at all times.
| Product Information | |
|---|---|
| System Compatibility | Foster Full DC Inverter VRF Outdoor Units |
| Indoor Unit Types | 8 Types (see full range below) |
| Technology | Full DC Inverter |
| Refrigerant | R-410A |
| Control | Individual zone BMS / central controller compatible |
| Operation | Flexible, energy-efficient, precise climate control |
| Application | Residential, Commercial, Hospitality, Healthcare, Industrial |
Full VRF Indoor Unit Range
1. DC Inverter Slim Duct
The DC Inverter Slim Duct unit is a low-profile concealed unit designed for installations where ceiling void depth is restricted. Its slim dimensions allow installation in locations where standard ducted units cannot fit without sacrificing airflow performance or energy efficiency.
- Ultra-low profile height – Fits into shallow ceiling voids in residential and light commercial fit-outs
- DC inverter fan motor – Precise, quiet fan speed control for low-noise concealed operation
- Ideal for: Luxury apartments, villas, hotel rooms, boutique offices, and retrofit installations
2. High Static Pressure Duct
The High Static Pressure Duct unit is engineered for installations requiring air distribution across long duct runs or complex ductwork networks. Its powerful fan delivers airflow against high external static pressure ensuring consistent supply air volume across large floor plates.
- High ESP capability – Suitable for long duct runs and complex distribution networks in large commercial spaces
- Flexible duct connection – Top, bottom, or rear discharge configurations to suit plant room layouts
- Ideal for: Large offices, retail floors, airports, hospitals, and institutional buildings
3. Fresh Air Processing Unit
The Fresh Air Processing Unit (FAPU) integrates directly into the VRF system to condition and introduce 100% outdoor fresh air addressing mandatory ventilation requirements without the need for a separate AHU or FCU system.
- Direct VRF integration – Fresh air is conditioned using the VRF refrigerant circuit, no separate chilled water or DX system required
- Energy recovery option – Compatible with heat recovery ventilation for pre-conditioning of incoming outdoor air
- Ideal for: Offices, restaurants, classrooms, and any space with mandatory outdoor air ventilation requirements per ASHRAE 62.1
4. Wall Mounted
The Wall Mounted indoor unit is the most versatile and widely specified unit type suitable for virtually any residential or commercial space. Its slim, modern profile and straightforward installation make it the preferred choice for individual room cooling across a wide range of applications.
- Modern slim design – Low-profile casing suits contemporary residential and commercial interiors
- Auto-swing louvers – Motorised airflow direction control for optimal air distribution
- Ideal for: Bedrooms, living rooms, offices, retail shops, clinics, and hotel rooms
5. Ceiling & Floor
The Ceiling & Floor unit offers dual-position installation flexibility mountable on either the ceiling or the floor depending on the space configuration and architectural requirements. This makes it particularly valuable for spaces where neither standard wall nor ceiling mounting is practical.
- Dual mounting positions – Ceiling or floor installation from a single unit design
- Long throw airflow – Delivers conditioned air across the full depth of the room from either position
- Ideal for: Conservatories, showrooms, spaces with full-height glazing, and rooms with no ceiling void
6. 1-Way Cassette
The 1-Way Cassette discharges conditioned air in a single direction, ideal for perimeter zones, corridors, and spaces where directional airflow is preferred or where ceiling constraints prevent multi-directional units.
- Single-direction discharge – Focused airflow for perimeter or corridor applications
- Flush ceiling installation – Panel sits flush with the finished ceiling for a clean, unobtrusive appearance
- Ideal for: Corridors, narrow spaces, perimeter office zones, and retail layouts
7. 2-Way Cassette
The 2-Way Cassette delivers conditioned air in two opposing directions, suited to elongated rooms, open-plan spaces, and layouts where airflow needs to reach both sides of a central ceiling position.
- Dual-direction discharge – Even air distribution across elongated or rectangular spaces
- Flexible blade configuration – Adjustable louvers for customised airflow direction
- Ideal for: Meeting rooms, elongated offices, retail stores, and restaurant dining areas
8. 4-Way Cassette
The 4-Way Cassette is the most popular VRF indoor unit type for open-plan commercial environments, delivering 360° airflow distribution from a central ceiling position for even temperature across the entire floor area.
- 360° airflow distribution – Four-direction discharge ensures uniform temperature across square and rectangular rooms
- Auto-swing louvers – Motorised independently controlled louvers on all four sides
- Condensate pump – Built-in condensate lift pump for installation flexibility
- Ideal for: Open-plan offices, hotel lobbies, retail floors, restaurants, and conference rooms
DC Inverter Technology – Across Every Indoor Unit
Every unit in the Foster VRF Indoor Unit range operates on Full DC Inverter technology:
- Continuous capacity modulation – Refrigerant flow to each indoor unit is independently varied in real time, matching the exact thermal load of each zone
- Individual zone independence – Each indoor unit operates independently, so unoccupied zones can be switched off without affecting other areas
- Energy savings up to 40% – DC inverter modulation eliminates the energy waste of on/off cycling across every zone simultaneously
- Precise temperature control – Maintains set temperature within tight tolerances for draught-free, consistent comfort
- Low noise operation – DC inverter fan motors in all indoor units run at minimum speed during stable conditions – significantly reducing operational noise
- Fast response – Rapid system response to zone load changes prevents temperature drift and maintains comfort without manual intervention
Seamless Compatibility with Foster Full DC Inverter Outdoor Units
All indoor units in this range are engineered for seamless compatibility with Foster Full DC Inverter VRF Outdoor Units:
- Optimised refrigerant management – Indoor and outdoor units communicate via a proprietary control protocol to optimise refrigerant distribution across all active zones simultaneously
- Mixed indoor unit types – Different indoor unit types (e.g., cassette + slim duct + wall mounted) can be connected to the same outdoor unit, providing total design flexibility within a single system
- Long refrigerant piping – System supports extended refrigerant pipe lengths and vertical drops, ideal for multi-storey buildings and large floor plates
- Centralised control – All indoor units manageable from a single central controller, touch panel, BMS interface, or smartphone app
- System fault diagnostics – Indoor and outdoor units share diagnostic data for faster fault identification and reduced maintenance response times
Smart Controls & BMS Integration
The VRF Indoor Unit range supports comprehensive control and integration options:
- Individual remote controls – Standard infrared remote supplied with every indoor unit for direct zone control
- Wired wall controllers – Optional wired controllers for fixed panel operation in commercial environments
- Central controller – Manage all indoor units across a building from a single central interface
- BMS integration – Modbus and BACnet protocols supported for integration with Building Management Systems
- Smartphone & Wi-Fi control – Optional Wi-Fi adapter for app-based remote monitoring and scheduling
- Group control – Zone grouping allows multiple indoor units to be controlled simultaneously as a single group
Applications
The Foster VRF Indoor Unit range is specified across a wide variety of projects:
- Corporate Offices – Open-plan floors using 4-way cassettes; private offices and meeting rooms using wall-mounted or slim duct units
- Hotels & Resorts – Guest rooms with wall-mounted or slim duct units; lobbies and restaurants with 4-way cassettes
- Residential Villas & Apartments – Slim duct units for concealed bedroom installations; wall-mounted units for living areas
- Retail & Shopping Malls – 4-way and 2-way cassettes for retail floors; slim duct for boutique fit-outs
- Healthcare Facilities – Wall-mounted and ducted units for clinical areas; fresh air processing units for mandatory ventilation
- Educational Institutions – Wall-mounted and cassette units for classrooms; ducted units for assembly halls and gymnasiums
- Hospitality & F&B – Wall-mounted and cassette units for restaurant dining areas; high static duct units for kitchens
- Mixed-Use Developments – Multiple indoor unit types across retail, office, and residential floors, all served by a single VRF outdoor plant
