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Frequently Asked Questions
What is a blower coil unit?
A small ducted air handler serving a zone.
It contains a blower, a coil and a filter.
It is installed out of sight.
Ductwork distributes air to several rooms.
An outdoor condensing unit usually feeds it.
How does it differ from a fan coil unit?
It is ducted and serves several rooms.
A fan coil serves the room it sits in.
A fan coil is fed by central water plant.
This unit normally has a refrigerant circuit behind it.
Different position, different plant.
How does it differ from a central air handler?
It is dedicated to one zone, not a building.
It is far smaller and needs no plant room.
It hides in a cupboard, attic or ceiling void.
A central unit serves many zones at once.
The distribution system is much simpler here.
Why does external static pressure matter?
Because the blower must overcome the duct system.
Ducts, grilles and the filter all resist flow.
Rated airflow assumes a stated resistance.
Beyond it, delivered airflow falls away.
This is the commonest cause of disappointment.
What should be checked at selection?
Airflow at the actual external static pressure.
Not the headline airflow figure alone.
The duct design should be known first.
Filter resistance belongs in the calculation.
Allow for the filter loading, not just its clean state.
Why is filter access so important?
A filter that cannot be reached is not changed.
These units are hidden by design.
Access panels must be planned into the ceiling.
A neglected filter throttles the whole system.
It also loads the coil with dirt.
What does the condensate arrangement need?
A drain with a genuine fall on it.
Above a finished ceiling, more is required.
A secondary tray or a safety switch is normal.
That switch stops the unit before it overflows.
A ceiling stain is a poor first warning.