Start with wall mounted or ceiling suspended options.
Guide
Which fan coil type fits the job?
This guide compares the main indoor-unit formats Coolflow commonly plans around: wall mounted, cassette, ducted, ceiling suspended, floor mounted, and AHU-based setups.
The point is practical selection, not catalogue overload. Start with how visible the unit can be, whether there is ceiling void, how even the air distribution needs to feel, and how much ductwork the project can absorb.
Quick Selection Logic
Cassette or concealed ducted will usually make more sense.
Ducted becomes the stronger option if ceiling space and access can be coordinated.
That is usually the point where AHU-based design should be considered.
Indoor Unit Formats
The main options and where they fit
Each format solves a different mix of aesthetics, coordination effort, airflow pattern, and service access.
Wall Mounted
The fastest residential-style option when you want direct throw, easy servicing access, and minimal ceiling work.
- Best for
- Bedrooms, small offices, tuition rooms, treatment rooms, and retrofit projects with limited ceiling void.
- Watch out for
- Visible on the wall and less discreet than concealed options. Drain routing and appearance matter more in finished interiors.
- Typical pairing
- Commonly paired with single-split, multi-split, or compact VRV outdoor units.
Cassette
A ceiling-recessed indoor unit that spreads air more evenly across open rooms and keeps the equipment body out of sight.
- Best for
- Retail, meeting rooms, restaurants, clinics, and offices with a false ceiling.
- Watch out for
- Needs ceiling access, drain planning, and enough clear height above the ceiling. Panel position affects comfort and servicing.
- Typical pairing
- Often matched with SkyAir single-split systems or VRV for commercial zoning.
Ducted
A concealed indoor unit connected to ducts, ideal when you want linear grilles, multiple supply points, or cleaner-looking interiors.
- Best for
- High-end residential work, restaurants, offices, boardrooms, and spaces that need hidden equipment.
- Watch out for
- Requires coordination for duct routing, return-air path, static pressure, ceiling height, and access panels.
- Typical pairing
- Used with multi-split ducted FCUs, SkyAir ducted systems, or VRV indoor units.
Ceiling Suspended
A practical exposed indoor unit for rooms that do not have enough ceiling void for a cassette or concealed ducted unit.
- Best for
- Shophouses, kitchens, workshops, stores, classrooms, and retrofit jobs with slab soffits.
- Watch out for
- The unit stays visible below the ceiling, so throw direction and mounting position need to be planned properly.
- Typical pairing
- Common on SkyAir-type single-split commercial systems and selected VRV applications.
Floor Mounted
Useful when wall height is limited, glazing dominates the facade, or occupants want cooling delivered from a lower position.
- Best for
- Showrooms, perimeter zones, older buildings, and rooms with low walls or large windows.
- Watch out for
- Furniture placement, air throw, and condensate routing need early coordination because the unit occupies usable wall space.
- Typical pairing
- More common in selected split, VRV, or chilled-water fan-coil applications than in standard residential packages.
AHU
Best treated as the next step up from a fan coil when airflow volume, filtration, fresh-air handling, or external static pressure become the main requirement.
- Best for
- Large open-plan commercial areas, fresh-air treatment, industrial/process zones, and projects with central duct distribution.
- Watch out for
- Needs stronger design coordination around ductwork, controls, access, ESP, and plantroom or service-yard space.
- Typical pairing
- Usually paired with VRV AHU kits, DX systems, or chilled-water systems instead of light residential multi-split equipment.
Comparison
Fast comparison table
Use this when the shortlist is still broad and you need to narrow it down quickly.
| Type | Visibility | Ceiling Requirement | Typical Use | Selection Note |
|---|---|---|---|---|
| Wall mounted | Visible on wall | Low requirement | Fast retrofit and smaller rooms | Simple and cost-efficient when aesthetics are acceptable. |
| Cassette | Only panel visible | Needs false ceiling | Open rooms with broader air distribution | Commercial favourite when ceiling space is available. |
| Ducted | Hidden above ceiling | Highest coordination need | Premium concealed finish or multi-grille layout | Best visual result, but more design work. |
| Ceiling suspended | Visible below soffit | No false ceiling needed | Retrofit commercial rooms and utility zones | Good when cassette or ducted cannot fit. |
| Floor mounted | Visible at low level | Low requirement | Perimeter zones and rooms with window-heavy walls | Useful when wall or ceiling options are constrained. |
| AHU | Usually hidden in plant or service area | Project-dependent | High-airflow, higher-ESP, fresh-air or central duct systems | This is a system-level choice, not just a room unit choice. |
Daikin CU Shapes
Representative outdoor-unit shapes to explain the difference
These are not just capacity labels. The outdoor-unit form factor affects ledge planning, lifting, service clearance, and how many indoor units one condenser can support.
Multi-Split CU
Daikin MKM75ZVMG
A wide single-fan outdoor unit used when one condensing unit serves several smaller indoor units.
- Representative use: multi-room residential or light commercial zoning
- Official Daikin consumer listing dimension: 695 × 930 × 350 mm
- Why it matters: wider body than small single splits, but still compact enough for many ledges
5 HP Single-Split CU
Daikin R32 SkyAir 5 HP class
A commercial single-split outdoor unit shape commonly selected for a single larger cassette, ducted, or suspended FCU.
- Representative use: one larger commercial indoor unit on one outdoor unit
- Daikin R32 SkyAir 5 HP class sits between residential cabinets and larger twin-fan commercial cabinets
- Why it matters: useful reference when planning service-yard width and condenser grouping
6 HP Double-Fan Single-Split CU
Daikin R32 SkyAir 6 HP class
A larger single-split commercial cabinet where the outdoor unit footprint and airflow clearance start to matter more.
- Representative use: higher-load cassette, ducted, or ceiling-suspended systems
- Daikin R32 SkyAir product range covers higher-capacity single-split commercial applications
- Why it matters: plan for heavier cabinet handling and more breathing room around the condenser
VRV Single-Module CU
Daikin VRV S 4 to 6 HP single module
A compact VRV outdoor unit intended for multiple indoor zones from one module, with longer piping flexibility than typical split systems.
- Representative use: small offices, retail units, clinics, and fit-out projects
- Official Daikin VRV S range note: up to 9 indoor units connect to one outdoor unit
- Official Daikin VRV S range note: actual piping length up to 120 m and total piping length up to 300 m
Selection Advice
How Coolflow typically narrows the right option
The indoor unit should follow the room condition first, then the outdoor-unit family, then the controls and service strategy.
Start with the room
Ceiling height, false-ceiling depth, glazing, room shape, and where people sit will usually eliminate the wrong FCU type quickly.
Then check the system architecture
One room may suit a single split, several rooms may suit multi-split, and a multi-zone commercial fit-out may justify VRV or AHU integration.
Then check serviceability
Access panels, drain falls, filter cleaning access, condenser placement, and future replacement path are often where a good concept becomes a workable project.
Reference Basis
Representative Daikin references used for this guide
This page uses current official Daikin Singapore product families as reference points for the unit formats and condenser examples.
- Daikin consumer air-conditioner listing for CTKM / CDKM / FDMF indoor units and MKM outdoor units.
- Daikin Singapore R32 SkyAir product page for cassette, wall-mounted, ducted, and ceiling-suspended commercial indoor-unit formats.
- Daikin Singapore VRV S product page for compact single-module VRV references.
- Daikin Singapore FCU and VRV AHU product pages for chilled-water FCU and AHU context.