If you have ever been handed a maintenance schedule and wondered where the tasks and frequencies actually came from, the answer is usually SFG20. It is the recognised industry standard for planned maintenance of building services, and it is what a well-run air handling maintenance regime is built on.
What SFG20 is
SFG20 is a library of maintenance schedules maintained by the Building Engineering Services Association. For every type of building services asset — including air handling units, fans, coils, dampers and filters — it defines the maintenance tasks that should be carried out and how often. Each task is colour-coded by criticality: statutory, mandatory, optimal. It is regularly updated to reflect changing regulations, so a schedule built on SFG20 stays current.
Why it matters for air handling units
An air handling unit is a collection of components that degrade at different rates. Filters load up in weeks; belts and bearings wear over months; coils foul gradually over years. A maintenance schedule that treats the unit as one thing, serviced once a year, will over-attend some parts and neglect others.
SFG20 breaks the AHU down properly. It tells you that filters need checking on one frequency, drive components on another, coils on another again — and it flags which of those tasks are legally required versus which are best practice. The result is a maintenance regime matched to how the equipment actually wears, rather than an arbitrary annual visit.
The compliance angle
For any organisation with a duty to maintain its building services — which is most — being able to show that maintenance follows a recognised standard matters. If something goes wrong, “we maintained it in line with SFG20” is a defensible position. “We had someone look at it now and then” is not. SFG20-based schedules give you that documented, standards-based record.
Putting it into practice
Adopting SFG20 does not mean more maintenance for its own sake. Done well, it often means smarter maintenance — the right tasks at the right intervals, with statutory items never missed and effort not wasted on things that do not need it. The efficiency case and the compliance case point the same way.
We build our air handling maintenance contracts around SFG20, tailored to your specific units and how hard they work. That gives you a schedule that is current, defensible, and matched to your equipment — not a generic checklist.
If your AHU maintenance is not built on a recognised standard, it is worth reviewing what you are actually getting for it. For more information, get in touch.
