Ventilation filter guides

How often to change them, which filter class, how to find the right size: what we explain every week on site, in one place.

• How often should you change your MVHR filters?Change your MVHR filters about every six months and inspect them in between. Traffic, building work, pollen and pets may make them dirty sooner, while the screen reminder is only a timer.4 min readRead more ›
• G4 vs F7 ventilation filters: they do different jobsG4 and F7 labels describe different levels of filtration, while ISO Coarse and ePM1 come from the newer standard. Here is how to place them in an MVHR unit and judge whether two F7 filters are useful.4 min readRead more ›
• How to find the right ventilation filter sizeYou can identify a ventilation filter from the model plate, the reference on its frame or its exact dimensions. Here is what to copy, measure and enter when searching.4 min readRead more ›
• Replacing filters in a Zehnder ComfoAir Q350, Q450 or Q600The ComfoAir Q350, Q450 and Q600 each use two filters of the same size, fitted behind covers at the front of the unit. Here is how to identify, replace and position them, then reset the counter.4 min readRead more ›
• The filters for a Brink Flair 325 also fit the Flair 400The Brink Flair 325 and Flair 400 each use two 245 × 510 mm filters, one for supply air and one for extract air. This guide covers the known references, fitting steps and different Flair sizes.5 min readRead more ›
• Measure Zehnder ComfoD 350 filters before choosing a sizeComfoD filter sizes vary by model, and the 350, 450 and 550 appear in two formats. This guide shows what to measure, how to identify your set and how to replace both filters without guessing.5 min readRead more ›