For those who don't already know, it is possible to create a DIY air filter on the cheap using a box fan + furnace filter. Is there a big difference between Merv and HEPA?
Merv stands for Minimum Efficiency Reporting Value. Higher Merv typically equates to more aggressive filtering but this can come at a cost of more expensive filters with lower air flow. Higher Merv means the filter will filter out a smaller particle size, down to 0.3 micron. Merv 13-16 has a minimum 0.3 micron particle size, and there are Merv which go as far as Merv 20 with < 0.3 micron which can even capture viruses and smoke. Generally from what I gather there isn't much benefit economically for allergy sufferers to go with anything more than Merv 13 but if you've got the money and want to you can go with Merv 20.
HEPA generally is what most standard air filters use and the HEPA filter also filters out at 0.3 micron. HEPA filters are much more expensive but at the same time seem to be slightly more effective. So they cost more, but are more effective too. Generally though the filters do not last so if you use a HEPA filter or a Merv 13 you will have to replace them but it seems the HEPA filters have to be replaced much sooner particularly because they are more likely to capture particles at a faster rate.
Conclusion
Merv 13 with a box fan seems very effective and cheap. Price to performance favors a DIY approach using a box fan and Merv 13. If you've got plenty of money and want quality well then you can go with HEPA as this can clear the air at a faster rate. Generally though they both clear the air at around the same level so there is no noticeable difference.
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can you create similar post about humidifier? i love those things and want to create diy :)
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Thank you for sharing this with us, good job.
Nice post bro. Information that is very useful to us all. Thank you for the article. :) please follow me and upvote my post.
Nice post.Normally in hospitals HEPA ( High efficiency particulate air ) filters are used. Cost vice HEPA and Merv 17-20 are almost equal.
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For those who don't already know, it is possible to create a DIY air filter on the cheap using a box fan + furnace filter. Is there a big difference between Merv and HEPA?
Regard
wow wow wow great post, thanks
I must go and try too :))
I like to experiment with different DIY projects myself (you can see it at my articles) however it is never based on technology mostly on home made natural products to avoid chemicals, maybe I should try some technology related stuff in the future. because this is cool stuff. ^^
That"s very smart. I really think every room we occupy regularly should have a air filter. I have one in my bedroom which also ionize the air. I'm looking to possibly buy or now build one for my living room.
Thanks! They look easy to build and I'm sure they must be really effective.
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This is a brilliant idea.
I've seen something similar for people who do woodworking to filter sawdust out of the air but hadn't considered it as an alternative for a HEPA filter. I stopped using the HEPA filters years ago because the replacement filters were so damned expensive.
Okay, this is awesome!!!! I never would have thought of this!! Thanks so much for sharing. :) I enjoy DIY and anything Earth friendly! Following you now!
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thanks - but when building the DIY - does the fan blow into the filter or suck out ?
Thank you sir, been using box fans plus a filter for years, but seeing that video made it make sense to my friends.