Difficult from the brief information you have given - but it sounds as if you have ontool extraction.

The HSE has a very good question and answer page Local exhaust ventilation - Frequently asked questions (hse.gov.uk)  which has the following advice,

Yes. On-tool extraction is a form of local exhaust ventilation (LEV). The TExT ensures that the LEV system continues to meet its intended operating performance and effectively contributes to achieving adequate control as required under regulation 7 of COSHH. However, the TExT for on-tool extraction equipment is only necessary for the extraction unit itself. Other items are covered by your maintenance checks – see below.

The extraction unit should be thoroughly examined and tested at least every 14 months. More frequent testing may be required if regular wear and tear could prematurely reduce the unit's effectiveness. Keep a copy of the report issued by the examiner. Address any critical defects immediately. Putting a test label on an extraction unit is a quick and effective way of indicating to users that the unit has undergone a TExT, that it has passed and the next examination due date. This is particularly the case for situations where different people may regularly use the extraction unit such as the construction or hire industries.

Its not just the vac that requires the examination its the system as a whole to make sure its working effectively.