Iran Nezam Mechanical Supervision Exam

It is a Persian-language, multiple-choice test. Each item has one correct answer and there is no oral or practical component. Administrative details such as the number of items, the sitting time and the pass mark are set by the official registration body for each cycle, so check its website rather than relying on older candidates' recollections.

Most candidates find the breadth harder than the depth. Individual questions are usually tractable, but they jump between code clauses, load calculations, pipe and duct sizing, gas installations and supervision paperwork. Those who only revise HVAC theory struggle on the regulatory and professional-practice items, and vice versa.

Retakes are normally possible in later exam cycles, but the rules on waiting periods, repeat attempts and any limit on the number of sittings are set by the official body and can be revised. Confirm the current retake policy and any re-registration deadlines directly with that organisation before planning your next attempt.

Candidates in full-time work typically spread preparation over two to three months, studying in the evenings. Those returning to the material after several years away from building services often need longer. The decisive factor is not hours logged but whether you have actually worked through the code chapters and solved numerical problems yourself.

Start with the building code chapters, because they frame the vocabulary and the mandatory requirements the other topics assume. Then move to load calculations and equipment selection, followed by piping, ducting, plumbing, gas and fire. Finish with supervision duties, ethics and contracts, which are easier to absorb once the technical context is familiar.

Three recurrences: memorising tables without understanding when a clause applies, skipping numerical practice on loads and sizing so calculation items consume too much time, and neglecting the professional-practice and contract topics as 'easy'. Another frequent problem is using outdated code editions when a newer Mabhas edition governs the answer.

Both appear. Many items test code requirements, definitions, minimum values and supervision procedure, which reward careful reading. Others require short calculations - heat loss, airflow, pipe sizing, gas flow or pressure drop. Practise with a non-programmable calculator and get used to estimating quickly, since time per item is limited.

Work from the current editions of the relevant national building code chapters (Mabhas 14, 16, 17 and 22) plus a standard HVAC and plumbing reference for methods. Always verify which edition the exam cycle is based on - using a superseded chapter is a common and avoidable source of wrong answers.

Passing the exam is one step in the registration process, not the whole licence. Practical experience requirements, documentation and formal issuance are handled by the official registration body. Check its published requirements for your specific grade and field before assuming the exam result alone qualifies you to sign supervision documents.