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MVHR Filters for Zehnder CA 155


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I have just renovated a Victorian semi, and fitted a Zehnder CA 155 WM MVHR unit.

 

I'm looking to upgrade the standard 'G3' grade filters, but can't find anything finer than G4 for the CA 155 model. 

 

Would upgraded filters from any other model fit? If not, is there a way of modifying/making custom filters? My daughter and I have asthma, so it would be great to fit F7 grade or better filters to deal with PM1 particles.

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