When it is needed
If rooms are stuffy or cold, air transfers or condensation occur, or there is a dispute about system capacity.
What we examine
- Ducts and grilles
- Ventilation units
- Air conditioning systems
Materials to prepare
- Design and working diagrams
- Equipment data sheets
- Commissioning records
- Room plans and complaints
Sample questions
- Does the actual configuration comply with the design solutions?
- What are the operating parameters under the conditions examined?
- Are there signs of installation or commissioning defects?
- How do changes to rooms affect system operation?
- Which identified defects relate to the reported complaints?
Build a set of questions →
How the work is carried out
- Checking the original requirements
- Inspection and agreed measurements
- Analysis of the balance and causes of deviations
Result
A report stating measurement conditions, comparing parameters and listing established deviations.
What affects the conclusions
Assessment of a particular operating mode requires accessible, functioning equipment. Sanitary laboratory examinations are agreed separately.
Frequently asked questions
Can just one flat be checked?
Yes. The report will state the inspection boundaries and the effect of inaccessible common sections.
Is measuring the velocity at a grille sufficient?
A conclusion about the system may require airflow rates, operating conditions and supply air information.
How to link measurements to a particular system and room
The complaint ‘the ventilation does not work’ may relate to one room, a network branch or the entire unit. Before examination, it is useful to mark problem areas on a plan, note when the problem occurs and record conditions: room occupancy, window and door positions, and operation of extract ventilation, air conditioning and neighbouring systems. This information helps select operating conditions and inspection points to be checked.
For each comparison point, retain its diagram designation, actual value, measurement unit and the source of the value used for comparison. The design airflow, a fan data sheet rating and a grille measurement describe different conditions. They must not replace one another without explanation. Calculating flow from air velocity depends on cross-sectional geometry, the measurement method and allowance for uneven flow.
What must remain verifiable in the record
- Which unit and which rooms were served during the check.
- Which operating modes, control settings and regulating element positions were recorded.
- Where measurements were taken and how the points correspond to the design configuration.
- Which original readings were used and how average and calculated quantities were obtained.
- Which sections were inaccessible and which parameters were not checked in this inspection.
If the problem arises only at a certain load or when equipment operates together, this is stated separately in the brief. A single measurement in another mode does not automatically establish the absence of the reported defect. The outcome must show which facts were established directly and which require further checking.
If several design revisions exist for the site, identify which changes were actually implemented. It is useful to link the unit's diagram identifier to its equipment marking. Otherwise, a record for one fan could be compared with another fan's characteristics. A missing as-built drawing is noted separately; it must not be silently replaced with an earlier design that may no longer reflect the modified system.
