P602 LEV Design – Manual Design Calculation Sheet

A Practical Design Worksheet for LEV Calculations and System Design Exercises

LEVCentral Expert Commentary

One of the challenges facing candidates undertaking the BOHS P602 Proficiency Module is translating ventilation theory into practical system design calculations. Whilst software tools and spreadsheets are widely used in industry, developing a sound understanding of manual calculation methods remains an important part of the learning process.

This downloadable calculation sheet has been developed as a practical aid for students attending P602 training courses. It provides a structured framework for recording design calculations and working through the key stages of LEV system design.

The worksheet can be used when calculating airflow requirements, transport velocities, duct sizing, pressure losses, fan duties and other fundamental design parameters commonly encountered during P602 exercises. By working through calculations manually, students develop a better understanding of the relationships between airflow, velocity, pressure and system performance.

For many learners, one of the greatest benefits of using a structured calculation sheet is the reduction in transcription errors. Design calculations often involve multiple stages, and a logical layout can make it easier to identify mistakes, check assumptions and review calculation methodology.

Although intended primarily as a training resource, the worksheet may also prove useful for practising engineers who wish to perform quick design checks, verify software outputs or develop preliminary system concepts before undertaking more detailed design work.

It should be remembered that calculation sheets are tools rather than design solutions. Competent LEV design requires consideration of hood performance, contaminant characteristics, process requirements, system balancing, energy consumption, maintainability and commissioning requirements in addition to the numerical calculations themselves.

Calculation Sheet (Word)

Download P602 Calculation Sheet

Key Learning Points

LEV design calculations remain a fundamental engineering skill.
Manual calculations help develop a deeper understanding of ventilation principles.
Structured worksheets can reduce calculation and transcription errors.
Airflow, velocity, pressure loss and fan calculations are closely linked.
Design calculations should be documented in a clear and logical format.
Calculation sheets support learning and examination preparation.
Manual calculations provide an effective method of checking software outputs.
Engineering judgement remains essential alongside mathematical calculations.

Source Document Information

Organisation: OXYL8

Document: P602 Manual Calculation Sheet

Document Type: Design Worksheet

Primary Topics: LEV Design, Ventilation Calculations, Duct Sizing, Pressure Losses, Fan Selection, P602 Training

Audience: P602 Candidates, LEV Designers, Ventilation Engineers, Commissioning Engineers and Technical Practitioners

Further Resources

Recommended Learning

Thought Leadership

Modern design software has transformed the speed and accuracy with which ventilation systems can be modelled and analysed. However, the most effective designers are often those who understand the underlying calculations rather than relying entirely on software outputs.

Manual calculation exercises help build intuition about how ventilation systems behave. They encourage engineers to question results, identify anomalies and develop a practical understanding of the relationships between airflow, pressure and system performance. This understanding becomes particularly valuable when troubleshooting existing installations, reviewing commissioning data or defending design decisions.

For P602 candidates, the objective is not simply to pass an examination. It is to develop the engineering mindset required to design systems that are technically robust, practical to operate and capable of achieving effective control in the workplace.