The method
Before using the result
- Intervals are supplied by the user from the applicable manufacturer or documented maintenance programme. No prescribed interval or service completion is inferred.
Worked examples
These original training examples illustrate the method for IKECA Certified Exhaust Cleaning Specialist (CECS) Examination. Use the matching “Load example” button above to explore a variation; example values are not equipment settings or prescribed criteria.
1. Worked example
Preserve the programme source behind each exhaust-system service interval. Produce usable dates without inventing a universal mandatory cleaning frequency.
Supplied maintenance/service tasks
| Equipment | Task | Last service date | Documented service interval | Interval unit | Interval source |
|---|---|---|---|---|---|
| Unit A | Example service | 2026-10-01 | 3 | Months | Training example only |
- Dates use calendar days, independent of browser timezone.
- Monthly intervals retain the original day where valid; otherwise use month end.
- Scheduled tasks: 1
2. Comparison example
Compare a different supplied condition using the same method. For Kitchen Exhaust Exam, the important check is that the input meaning, units and method assumptions still match the problem.
Supplied maintenance/service tasks
| Equipment | Task | Last service date | Documented service interval | Interval unit | Interval source |
|---|---|---|---|---|---|
| Unit B | Example inspection | 2026-10-15 | 30 | Days | User-supplied example interval |
- Dates use calendar days, independent of browser timezone.
- Monthly intervals retain the original day where valid; otherwise use month end.
- Scheduled tasks: 1
Check your understanding
1. Which relationship is used?
Due date = last service date + documented days/months. Month addition clamps to the last valid day of the destination month.
2. Which assumption should you check first?
Intervals are supplied by the user from the applicable manufacturer or documented maintenance programme. No prescribed interval or service completion is inferred.
3. How should you verify a different unit system?
Convert every input to the displayed calculation units first. Equivalent physical inputs must give equivalent results; a unit label alone does not convert a number.
Continue with the matching exam topic
This tool connects to IKECA Certified Exhaust Cleaning Specialist (CECS) Examination free practice. Work through a question independently, then use the calculation steps to identify where your method differs. The tool stays free whether or not you choose paid preparation.