Air duct cleaning in Delft

Delft in figures: a small territory, a lot of knowledge

Delft has 109,577 inhabitants on roughly 23 km² of land and ranks 29th of the 342 municipalities. With 63,517 households, an average of 1.73 people live in each household. That is low: many small households, and therefore a lot of stacked housing.

Business services plus transport, information and communication add up to 39.7%. Think of engineering firms, software companies and consultants: workplaces where people spend long hours indoors and where air quality is noticeable. The World Green Building Council mentions a possible productivity gain of 8 to 11% from better indoor air quality.

Listed buildings: ducts where no panel will fit

In a historic city centre, ducts were often added later, through existing joists and walls. They are narrow, have many bends and rarely have inspection panels. Adding a panel is not always desirable in a listed building.

That is where the Intelligent Airnozzle for businesses with a camera is a strong option. The Intelligent Airnozzle from Danduct Clean works in ducts from 30 mm, takes tight 90 degree bends and propels itself forward by air pressure. The built in camera with LED lighting gives a black and white image on a monitor, so you see which spots are still dirty. Lamers puts it like this: cleaning with an air nozzle was always considered less effective than rotating brushes, but with the camera you see and clean every spot and corner.

• Required: a compressor delivering 700 litres per minute or more at about 10 bar, or nitrogen.
• Supplied: 20 metres of hose and a transport case. The monitor is separate.
• Can be linked to the Danduct Clean control boxes.

Laboratories and research rooms fall outside EN 15780

A misunderstanding that often comes up in a knowledge city: that EN 15780 applies to every ventilation system. The revised version from 2025 applies to ventilation systems, but explicitly not to industrial, medical and laboratory facilities. So for fume cupboards and process extraction in a lab you need other frameworks.

A trade article mentions a risk assessment every 2 years, and annually in high risk buildings such as hospitals and labs. That is not Dutch law, but it is a reasonable starting point if your maintenance plan does not yet have its own interval. The background to the standards is under EN 15780 duct cleanliness for cleaning contractors.

Residential complexes with collective mechanical ventilation

With 1.73 people per household, Delft has many small homes, often in complexes with central extraction on the roof. For property managers and owners' associations (VvE) that is a commercial job: one system, dozens of connections.

Milieu Centraal (Dutch public information centre) advises having the extract ducts of mechanical ventilation cleaned at least once every 8 years, servicing the ventilation unit once every 2 years and checking the whole system roughly every 4 years. Residents can clean the grilles themselves at least once a year.

For extract ducts like these, small and light machines are handy. With a power drill as the drive and a shaft of 2.5 to 7.5 metres, you can often cover an extract run between roof and dwelling in one go. More about this type of system can be read under ducts of mechanical ventilation.

Duct cleaning Delft: working order in a busy building

In a city with so little space, the work has to be compact and clean. A workable sequence:

1. Establish access. Where are the panels? Eurovent recommends openings no more than 10 metres apart or after no more than two bends of 45 degrees or more.
2. Inspect. Use a camera to see what is in the duct, so you choose the method based on the contamination and not on gut feeling.
3. Seal off and apply negative pressure. Close the section you are cleaning and keep it under negative pressure throughout. If the extraction unit exhausts indoors, a HEPA filter of 99.97% at 0.3 µm is required.
4. Clean. A rotating brush where possible, compressed air with a camera where it is too narrow or has too many bends.
5. Record the result. Photos and a before and after comparison, so the owner can show it.

Which machine belongs with which step is shown under air duct cleaning tools in practice.

Ventilation duct cleaning Delft and the Haaglanden region

Delft borders two municipalities, each with its own character. Den Haag is even more densely built, with 6,868 inhabitants per km², see duct cleaning equipment in Den Haag. Leidschendam-Voorburg has many offices and care facilities, see air duct cleaning in Leidschendam-Voorburg.

If you work in educational buildings, the page on school ventilation duct cleaning is a useful addition. All municipalities are listed under regional air duct cleaning for cleaning contractors. For a quotation or advice on the right machine, contact Lamers in Zelhem.

When you plan work across these neighbouring municipalities, it pays to group jobs by building type rather than by postcode. A listed canal house, a lab and a residential block each need a different set on the van, and sorting the diary that way saves trips back for missing accessories.