Like Lamers Reinigingstechniek, Deventer lies in the east of the Netherlands; Lamers is based in Zelhem in the Achterhoek region of Gelderland and supplies the equipment. On this page you will read how to record maintenance, which machine belongs with which situation and which reference points to include in your file.
Business activity in Deventer and what it asks of the ventilation
Deventer has 103,405 inhabitants and ranks 32nd of the 342 municipalities. Its density is 792 inhabitants per km² over 13,056 hectares of land, with urbanisation class 2. Besides the city, the municipality also includes countryside, which shows in 300 agricultural establishments. The breakdown per sector:
| Sector (CBS 2024) | Number | Share | What you record |
|---|---|---|---|
| Business services | 3,310 | 25.9% | inspections and filter changes per office building |
| Government, education and care | 2,580 | 20.2% | hygiene inspections, CO₂ in classrooms |
| Trade and hospitality | 2,295 | 17.9% | grease layer and kitchen cleaning certificate |
| Culture, recreation, other services | 1,445 | 11.3% | moisture extraction in sports and changing rooms |
| Manufacturing and energy | 1,390 | 10.9% | testing of local exhaust ventilation |
| Transport, information and communication | 930 | 7.3% | ventilation of technical rooms |
Almost half of the establishments (46.1%) are therefore in the two sectors where air quality for people is central.
What belongs in a maintenance file for duct cleaning in Deventer?
A file does not have to be complicated, but it does have to be complete. These parts deliver the most:
- Drawing or diagram of the ducts with diameters and the location of inspection hatches.
- Inspection report with date, photos or camera footage and an assessment of the contamination.
- Description of the cleaning work: method, brush type, sealing and negative pressure.
- Check afterwards: photos after cleaning, possibly a measurement by surface comparison or the gravimetric NADCA vacuum test.
- Planning for the next inspection, based on what you found.
For kitchen extraction, KHN (Royal Dutch Hospitality Association) asks that a clean duct is demonstrable with reporting, photos and a certificate. For care and operating theatres, the guideline on air handling prescribes an air management plan with technical management, maintenance and periodic checks.
A simple way to keep the file usable: one folder per building, with one sheet per duct run that carries the date, the finding and the next action. Then anyone who opens it sees at a glance where the building stands.
Which legal basis do you cite in a Deventer file?
With these references you substantiate why you carry out maintenance:
| Rule | What it says |
|---|---|
| Working Conditions Decree (Arbobesluit) art. 6.2 | sufficient uncontaminated air, installation always ready for use, signalling of failures |
| Building Works Living Environment Decree (Bbl) art. 3.67 onwards | almost every existing building has a ventilation facility that prevents damage to health |
| Arbobesluit art. 4.87b | measures against legionella where air is humidified |
| EN 15780:2025 | cleanliness classes, assessment of cleaning need and result, now also for commercial kitchens |
| KHN (hospitality) | no legal frequency, but maintenance so that no fire hazard arises |
Note: ventilation is covered in article 6.2 of the Arbobesluit. Article 6.4 is about keeping out sunlight and is sometimes cited incorrectly. An explanation of all standards is under VDI 6022 ventilation hygiene for cleaning contractors.
Ventilation duct cleaning Deventer: working with the DC4
In offices and care buildings you often find main ducts of 250 to 600 mm with vertical sections and bends. Electric duct brushing machine for businesses is made for that work. The light, solid steel shaft keeps the brush in the centre of the duct, the reach is up to 30 metres and the machine runs on 230 volts. You set speed and direction of rotation; the automatic left and right system reverses in time.
The manufacturer offers two packages. Medium contains the machine, shafts of 10 and 20 metres and a brush set of seven sizes from 100 to 600 mm. Large adds a 30 metre shaft, a trolley, an aggressive brush set and a shaft holder. A spraying system is available separately. For all other machines, look at duct cleaning kit in practice.
| DC4 package (Danduct) | Shafts | Brushes | Extras |
|---|---|---|---|
| Medium | 10 and 20 m | Set of seven sizes, 100 to 600 mm | None |
| Large | Up to 30 m | Plus aggressive brush set | Trolley, shaft holder |
Sealing off before you brush: how to prevent complaints
What you do not want after duct cleaning is dust on desks or in a care room. You prevent that with two measures. First, you close off the section you are working on: duct sealing balloons in round ducts and foam caps on valves and diffusers. Second, you keep the duct under negative pressure with an extraction unit, with a HEPA filter if it exhausts indoors.
Record both measures in your work description. It is part of a demonstrable working method and gives the users of the building confidence. Background is under vent caps for duct cleaning for businesses.
Fictional example: an office manager who puts his file in order
A fictional manager of three office buildings in Deventer has no idea when the ducts were last checked. He starts with a camera inspection per building and notes the contamination per duct run. Two buildings turn out to be lightly contaminated, the third has a thick layer of dust in the supply. He has that third building cleaned first; for the other two he plans a re-inspection.
As a reference point he adopts the advice from a trade article on EN 15780: a risk assessment every 2 years for offices. The result is a file that is on the table straight away when the occupational health service or a tenant asks a question. More on these buildings is under commercial building duct cleaning.
Deventer and the neighbouring cities in the east of the Netherlands
For maintenance teams working in the region: air duct cleaning in Apeldoorn describes an extensive municipality in Gelderland, and the page on ductwork cleaning for Zwolle businesses covers a municipality in Overijssel with a large share of care and education. All municipalities are under air duct cleaning by city for businesses.
Lamers has no branch in Deventer, but is located in the same part of the country. You can reach the company on +31 (0)314 623 341 or info@lamersequipment.nl, or request a quote through the website. If you want to know what cleaning costs when you outsource it, read about air duct cleaning cost for cleaning contractors.
Air duct cleaning equipment from Lamers at a glance
DC4 duct cleaning machineDC4: electric, up to 30 m, ducts from 100 to 600 mm
PD4 duct cleanerPD4: runs on a power drill, shaft 2.5 to 7.5 m
PD2 duct cleanerPD2: compact duct cleaner, specifications via Lamers
Intelligent AirnozzleCompressed air with camera, ducts from 30 mm
Duct cleaning brushesBrushes and shafts: soft, standard or Tynex
Duct sealing and extractionDuct balloons, diffuser caps and extraction
Frequently asked questions: air duct cleaning Deventer
What should a file for air duct cleaning in Deventer contain?
At least a diagram of the ducts, an inspection report with photos, a description of the cleaning work, the check afterwards and the planning for the next inspection. For kitchen extraction, KHN also asks for a report with photos and a certificate, so that you can show the insurer that the duct is clean.
Is Lamers located close to Deventer?
Lamers Reinigingstechniek is based in Zelhem in the Achterhoek region of Gelderland, in the east of the Netherlands just like Deventer. There is no branch in Deventer itself. You can reach Lamers by phone on +31 (0)314 623 341, by email at info@lamersequipment.nl or through the quote form on the website.
Which Arbobesluit article covers ventilation in Deventer offices?
That is article 6.2. It requires sufficient uncontaminated air at the workplace, an installation that is always ready for use and signalling of failures where that is necessary for health. Article 6.4 is sometimes mentioned, but it is about keeping out sunlight and has nothing to do with ventilation.
How many business establishments does Deventer have according to CBS?
According to CBS 2024, Deventer has 12,790 business establishments and 103,405 inhabitants. Business services is the largest sector with 3,310 establishments (25.9%), followed by government, education and care with 2,580 (20.2%) and trade and hospitality with 2,295 (17.9%).
How do you show that a duct in Deventer is really clean?
Take photos or camera footage before and after cleaning. For harder evidence, use a surface comparison or the gravimetric NADCA vacuum test. In kitchen extraction you measure the grease layer; the NVRL quality mark scheme uses a maximum of 200 µm after cleaning as the value to meet.
Which DC4 package suits an office manager in Deventer?
For ducts up to 20 metres, the Medium package with shafts of 10 and 20 metres and seven brushes from 100 to 600 mm is often enough. If you have longer runs or move the machine a lot, the Large package offers a 30 metre shaft, a trolley and an extra aggressive brush set. Lamers advises you on the choice.
How often do you assess the ducts in a Deventer office building?
There is no legal term. A trade article on EN 15780 mentions a risk assessment every 2 years for ordinary buildings and annually for high risk buildings such as hospitals and laboratories. Based on what you find, you plan cleaning or a re-inspection.
Is an air management plan mandatory for care in Deventer?
The guideline on air handling in operating theatres and treatment rooms makes an air management plan a mandatory part. It covers technical management, maintenance, periodic checks, procedures and responsibilities. For other care locations it is not a requirement, but it is a good model for your file.
How do you prevent dust in a care room during duct cleaning in Deventer?
Close off the duct section with balloons or foam caps on the valves and keep it under negative pressure with an extraction unit. If that unit exhausts indoors, use a HEPA filter with 99.97% at 0.3 µm. Plan the work when the room is empty and record the measures in your work description.
Does kitchen extraction in Deventer now fall under EN 15780?
Yes, the revised EN 15780:2025 extends its scope to extraction systems of commercial kitchens. There is no legal cleaning frequency for hospitality, but KHN points out that fire insurers do require regular maintenance and that you must be able to demonstrate that maintenance.
Sources and reference date
All facts on this page were checked on 6 October 2026.
- CBS key figures for districts and neighbourhoods 2024 (in Dutch)
- Working Conditions Decree (Arbobesluit) article 6.2 (in Dutch)
- IPLO ventilation in existing buildings (in Dutch)
- KHN cleaning the extract duct (in Dutch)
- Guideline: air management plan for operating theatres (in Dutch)
- UMD duct cleaning specification
- Danduct DC4
- MODBS Keep it Clean
Editorial team: Lamers Reinigingstechniek B.V., supplier of professional air duct cleaning equipment in Zelhem, the Netherlands. Updated on . See also Lamers Equipment in practice.
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