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Frequently Asked Questions
Why are these decided when the unit is ordered?
Because adding them later means returning to the roof.
Access equipment or a crane may be needed again.
A weatherproof cabinet has to be opened and resealed.
The same part costs several times more in year two.
Very little of it is genuinely a later purchase.
Which items are factory choices in practice?
Those that interlock with the unit itself.
Economiser sections and their hoods.
Powered exhaust arrangements.
Factory-mounted disconnect switches.
Field-assembled equivalents are seldom as weathertight.
Which can safely wait?
Items that bolt on without disturbing the cabinet.
Coil and hail guards on exposed elevations.
Filter racks.
Condensate provisions and drain heat tape.
Knowing which these are is worth real money.
Why does a disconnect need to be roof-rated?
Because it lives outdoors permanently.
Weather, sunlight and standing water all reach it.
An indoor-rated enclosure degrades quickly.
It must also be reachable from the service position.
Local wiring rules usually require one nearby.
What decides vibration isolation?
The structure, not the mechanical specification.
Roof deck construction governs how much moves.
What occupies the space below matters as much.
The structural engineer settles it at design.
It is not chosen from a price list.
Why does heat tape appear on a drain?
Because condensate freezes where the roof is cold.
A blocked drain backs up into the unit.
Overflow then finds its way into the building.
Tape and insulation keep the run clear.
It is only needed in climates that freeze.
Where does the curb decision sit?
Alongside these, but separately.
It has its own considerations entirely.
On a replacement it usually governs the programme.
It is settled before accessories are worth discussing.
The two decisions should not be conflated.