Ceiling void depth.

The body sits above the ceiling entirely.

Pipework, condensate and access all need clearance.

Refurbishments inherit whatever void exists.

Check it before anything else is specified.

Slim-body variants trade capacity for depth.

It is a comfort advantage rather than a capacity one.

Air is thrown along the ceiling and mixes.

It descends without dumping on the occupant.

Single-direction units create draughts below.

Individual vanes can usually be closed.

That helps near walls and over desks.

By a built-in pump and a drain with fall.

The unit sits above the ceiling with nowhere else to go.

Pump failure shows as ceiling damage.

It rarely shows as a cooling complaint first.

Alarm and shutdown on high level is important.

So is being able to reach the pump.

From below, through the grille.

The grille hinges or drops for access.

That accessibility decides whether it happens.

Neglected filters cost capacity quietly.

High ceilings need access equipment.

Factor that into the maintenance plan.

No, and that rules out many buildings.

The unit needs a void to sit in.

Exposed structures cannot conceal one.

Floor-standing or wall units serve instead.

Heritage interiors often fall into this case.

Establish the ceiling type at survey.

Most are sized to fit a standard grid module.

That gives a clean visual result.

Non-standard grids need trim kits.

Ask for the grille dimensions early.

Coordinate with lighting and sprinkler layout.

Late coordination produces awkward ceilings.

Some units accept a small fresh air connection.

That is not the same as ventilation provision.

Occupied spaces need designed ventilation separately.

A cassette recirculates room air by default.

Confirm what the building regulations require.

Do not rely on the cassette for it.