10 Proven Steps for Home Vent Cleaning (MVHR System)

1) Online Pre-Check

Before the visit, we confirm your ventilation system type — for example, Vent Axia, Zehnder, Komfovent, Domus or other brands. We collect key details such as installation date, duct layout, and filter type.
You’ll receive a short pre-service checklist to help us prepare for the inspection. As a result, we arrive ready with the correct tools, filters, and documentation.

2) Safety and Inspection

Upon arrival, our technician isolates power and confirms that the unit is safe to service. We check all electrical connections, cable runs, and mounting points.
Next, we examine every ventilation duct for loose joints, crushed sections, or missing insulation. In MVHR systems, we ensure warm-air ducts are insulated properly.
Additionally, we test the condensate drain for correct trapping and flow. We also inspect silencers, plenum boxes, and air valves for wear, ensuring nothing restricts airflow.

3) Filter Replace and Core Component Cleaning

We remove and replace/clean filters (as applicable). We clean the unit internally, including key components such as fans and accessible sections, using manufacturer-safe methods.

4) Heat Exchanger Cleaning

We always clean the heat exchanger according to the manufacturer’s guidelines. To protect delicate coatings, we use only non-harmful, approved cleaning agents, soft brush and rinse with clean water to remove all residues.
After cleaning, we position a portable fan to direct airflow onto the heat exchanger. This method accelerates drying and ensures the component is reinstalled following best practice. The drying phase typically takes a few hours.

5) Supply & Extract Points (Valves / Grilles)

We inspect and clean accessible supply and extract vents/valves, check for blockages, and confirm they are correctly positioned and not restricted by paint, dust, or poor placement.

6) Airflow and Functional Testing

Once cleaning is complete, we measure airflows at every grille using calibrated instruments. We compare readings with design data and adjust dampers for balance.
Furthermore, we test all speed settings — trickle, normal, and boost — to confirm smooth transitions.

7) Diagnostics & Control Settings

We check the controller settings and operating modes (normal/boost/timers/summer bypass where applicable). If the unit shows faults or unusual behaviour, we carry out basic error diagnostics and advise on repair steps if required.

8) Indoor Air Quality Snapshot (Optional but Recommended)

We take a practical IAQ snapshot (typically CO₂, VOCs, relative humidity (RH) and temperature) to show what your home air looks like today and what improvements to expect from correct ventilation.

9) Service Report & Recommendations

You receive a clear summary: what we found, what we cleaned/adjusted, measured airflow results, and recommendations (filters schedule, settings, upgrades, or repairs).

Before / After

Before / After