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Frequently Asked Questions
What is the specification most often left vague?
External static pressure.
The fan must overcome everything downstream.
Ducts, bends, filters and grilles all add resistance.
Units come in low, medium and high static versions.
Choosing on capacity alone misses it.
The far grille then receives no air.
How long should the duct runs be?
Short, and generously sized.
These are not air handling units.
Two or three outlets is the intended application.
Long distributions belong to different equipment.
Flexible duct costs pressure quickly.
Keep it short and straight where used.
Why does access matter more here than elsewhere?
Everything needing service is above a ceiling.
Filters, condensate pump and controls all need reaching.
An undersized hatch stops maintenance happening.
So does one in an unworkable position.
Insist on it at design stage.
It cannot be added conveniently later.
Where does filtration sit?
Usually in the return path.
That makes the return grille part of the design.
It has to be accessible for cleaning.
An unfiltered return fouls the coil.
Coil cleaning above a ceiling is expensive.
Specify the return, not just the supply.
Why choose this over a cassette?
Nothing of the unit is visible at all.
Only grilles appear in the room.
Grille positions can be placed freely.
Hotel bedrooms and apartments favour it.
A cassette shows its own face in the ceiling.
Visual requirement usually decides.
What void depth does it need?
Enough for the body plus duct connections.
That is more than a cassette in most cases.
Ducts need space to turn without crushing.
Slim units exist for shallow voids.
Condensate fall must be accommodated too.
Survey the void before selecting.
How is condensate handled?
By a pump and a drain route with fall.
The unit sits above the ceiling.
A failed pump damages the ceiling below.
High level alarm and shutdown are important.
The pump must be reachable through the hatch.
Plan the drain route with the duct layout.