Quick answer
Possibly, but being next to an exhaust fan is not enough to make a detector location suitable. The review must establish whether the gas of concern can reach that point under relevant operating conditions. Record the fan's operating states and available airflow evidence, then ask the responsible designer to approve the location. There is no universal fan-to-detector spacing given here.
Ask about gas arrival, not physical convenience
A nearby mounting surface or cable route may make installation easier without answering the monitoring question. The HSE gas-detection technical guidance identifies dispersion and dilution relative to possible leak sources as siting considerations. That is why a fan's presence alone cannot establish suitability.
Start the review with the proposed detector tag, the source it is intended to monitor and a drawing showing the relationship to the fan. Ask what evidence supports the location. Do not describe it as an approved point merely because it appears on a preliminary contractor sketch.
Document the fan states that the reviewer must consider
The following is an editorial survey checklist. Ask the facilities or ventilation owner to confirm which states actually apply rather than assuming every fan runs continuously.
| Operating state | Information to request |
|---|---|
| Normal production | Which fan runs, its documented operating mode and available survey records |
| Idle or shutdown | Whether extraction continues and who controls the schedule |
| Cleaning or changeover | Any different ventilation arrangement recorded by the site |
| Fan unavailable | The documented plant response and monitoring assumptions |
| Alarm response | Whether fan operation changes under the approved cause-and-effect |
Make airflow evidence traceable
Request the ventilation drawing revision, relevant commissioning records and the operating state in which any observation was made. Mark doors and openings on the survey sketch and note their observed state. A single photograph of a fan does not document its duty or establish where a release will travel.
Ask the designer whether the available information is sufficient or whether a specialist assessment is needed. Do not improvise a smoke, gas or release experiment on an operating safety system to settle the question. Any additional investigation needs its own approved method and competent personnel.
Separate the location decision from fan-control wiring
There are two different questions: where should the detector sense gas, and what should the system do when it alarms? A drawing showing a relay connected to ventilation does not answer the first. Likewise, a proposed sensing point does not authorize a particular fan-control sequence.
For a Malaysian M&E project, ask who owns each decision: the detector supplier, ventilation contractor, controls integrator and site representative may have different responsibilities. Request a common drawing reference and an agreed interface schedule so each party can identify the boundary of its work.
Record the decision and its change triggers
The accepted location record should identify the reviewed operating states, supporting documents and outstanding limitations. Ask the project team to define which later ventilation changes require a review, such as a changed operating schedule or a revised extraction arrangement. Retain the decision with the detector asset record.
Consult the existing UTAI system-layout guide for broader layout planning. This focused review supplies no universal clearance from a fan, no promise that extraction guarantees detection, and no instruction to move or bypass an operating detector. If a leak is suspected or an alarm occurs, follow the site emergency procedure.