Found an article in Passive House magazine looking for people to send in parts of there mvhr intake filter to sample air quality.

 

https://phi-architecture.com/mvhr-air-intake-filter-analysis/

@dimpsy I’m going to sign up for this thanks.  You would think the air should. be clean where I am but I change my  filters every month because they get so filthy.

@dimpsy that's very interesting, I'll sign up for that. I vacuum ours every three months and change them every six months when they still don't look as bad as in the picture in the link.

10 hours ago, PeterStarck said:

I'll sign up for that. I vacuum ours every three months and change them every six months when they still don't look as bad as in the picture in the link.

 

I suspect they might only want 'untouched' filters otherwise if they've been cleaned mid-cycle it could skew the quantitative assessment of how dirty the air is, unless they are only seeking to analyse pollutant types and not quantities (which might be meaningless given varying flow rates)? 

Edited June 26, 20197 yr by MJNewton

@MJNewton I have signed up. will see what comes back. I decided a while back to stop trying to clean up my filthy filters to extend the life of them, clean air worth a few extra quid to me as I am more sensitive than pollution and dirt than most. I change every 4-6 weeks.

I'd opine that the stuff that's really "pollution" will whizz straight through anything up to a classical HEPA filter.

12 minutes ago, dpmiller said:

I'd opine that the stuff that's really "pollution" will whizz straight through anything up to a classical HEPA filter.

I think you are right. I use the F7 filters which seem to be the highest available for my system.....I am sometimes tempted to put my dyson air purifier (with hepa filter) on and see what readings it gives.  Its a great air cleaner but no good for ventilation.

I signed up and have been accepted onto the programme.... I told them I changed my filters every 4-6 weeks so 6 weeks is the frequency of my sample returns.