Good points

Filter
Filter class G4
Free filter service

Bulex Airmaster HRD 275 / 350 MVHR filter G4 for bypass

1x Panel filter cardboard 135x175x23 mm. G4

Bulex Airmaster HRD 275 / 350 MVHR filter G4 is suitable for the Bulex Airmaster HRD 275 / 350 MVHR . This filter of the highest quality guarantees optimal functioning of the ventilation system together with healthier, filtered indoor air. Also note the prices when purchasing two, five or ten units: the price will be automatically reduced!

Free filter service

Everyone has the right to breathe clean air. Checking/cleaning or replacing filters plays an essential role in this. Virtually no attention is paid to this in practice. We do pay attention. As well as your order for your filter set, you will receive:

- Free reminder every three months
- Personal offers (e.g. filters)
- Tips and tricks for extending the life of your filters

Filter class comparison

You may have heard of it before: the new filter standard "ISO16890". The old filter classes (G4, M6, F9, etc.) will slowly disappear and be replaced by the new standard. To avoid ambiguities and make it clear for you, we have provided the diagram below where the old filter classes are compared with the new standard.

Filter class	ISO Coarse	ISO ePM10	ISO ePM2.5	ISO ePM1
G3	> 45 %	-	-	-
G4	> 90 %	-	-	-
M5	> 95 %	> 50 %	-	-
M6	> 95 %	> 60 %	50 - 60 %	-
F7	> 95 %	> 85 %	65 - 80 %	50 - 65 %
F8	> 95 %	> 90 %	> 80 %	65 - 80 %
F9	> 95 %	> 95 %	> 95 %	> 80 %

More information
Article – New regulations and standards for filters
Article – The effects of poor ventilation

Brand	Econox
Category	Bulex MVHR filters
GTIN	8719544141637
Manufacturer's item number	38012004
Article number	38012004

Specifications

Width	175 mm
Category code	89
Depth	25 mm
Unit	per piece
Filter class	G4
Filter class ISO	ISO grof 70%
Suitable for MVHR brand	Bulex
Suitable for MVHR type	Airmaster HRD 275 / 350 with bypass
Length	135 mm
Filter material	Synthetic
Filter Surround Material	Cardboard

Reviews

Blogs

See all blogs

Air Quality Ventilating your home in winter + 5 tips

Winter time has already arrived and the new lockdown measures have been introduced, which means we will spend much more time at home again. We often make the mistake of opening the heating in cold weather and closing the windows and grilles in the home, this causes a major deterioration in indoor air quality. Are you curious about how you can ensure that you achieve a healthy indoor climate in your own home in winter? Read on quickly!

Felix Dijkmeijer
02-12-2021

Scheme & grant New regulations MVHR filters: ISO16890

Filter class G4, M6, F9, and so on. For those who have a MVHR system, these terms are probably not unfamiliar. Since August 2018, something has changed: the filter standard EN779 has been replaced by ISO16890. This means that previously mentioned terms will give way to new, more specific designations. In this blog, we would like to explain the differences.

Felix Dijkmeijer
10-04-2026

Air Quality Which health complaints do I get as a result of poor ventilation?

The lack of fresh air in a room is very unhealthy. Among other things, it leads to physical complaints that are very quickly noticeable. This blog lists the complaints caused by poor ventilation and gives tips on how to prevent them.