The method
Before using the result
- This is a local worksheet. Findings and supplied criteria remain the responsibility of the person recording them; the output is not a certificate or regulatory approval.
- Minimum distances are supplied independently. This checks only entered dimensions and not appliance suitability, installation scope or other requirements.
Worked examples
These original training examples illustrate the method for NFI Gas Specialist. Use the matching “Load example” button above to explore a variation; example values are not equipment settings or prescribed criteria.
1. Worked example
Attach appliance-specific instructions to measured minimum distances. Preserve each margin without turning a few dimensions into an installation certificate.
- Manufacturer instructions / criterion source
- Training example only; replace with governing instructions
Supplied measured clearances
| Dimension/location | Measured distance (m) | Supplied minimum distance (m) |
|---|---|---|
| Example side | 0.2 | 0.15 |
| Example front | 0.4 | 0.45 |
- Example side: 0.2 − 0.15 m.
- Example front: 0.4 − 0.45 m.
- Dimensions recorded: 2
- Criterion source: Training example only; replace with governing instructions
2. Comparison example
Compare a different supplied condition using the same method. For Chimney Exam, the important check is that the input meaning, units and method assumptions still match the problem.
- Manufacturer instructions / criterion source
- Training example only; replace with governing instructions
Supplied measured clearances
| Dimension/location | Measured distance (m) | Supplied minimum distance (m) |
|---|---|---|
| Example rear | 0.3 | 0.25 |
- Example rear: 0.3 − 0.25 m.
- Dimensions recorded: 1
- Criterion source: Training example only; replace with governing instructions
Check your understanding
1. Which relationship is used?
For each entered minimum-distance criterion: margin = measured distance − supplied required distance.
2. Which assumption should you check first?
This is a local worksheet. Findings and supplied criteria remain the responsibility of the person recording them; the output is not a certificate or regulatory approval.
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 NFI Gas Specialist 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.