They definitely help filter out allergies and everything else! So much so that even air barely passes through these filters! I locked them out of my system because they literally suffocated my entire device. I've never heard my return make noise in front of these filters. As soon as I put this in, the vent whistled loudly and made a sucking noise so loud it woke my kids up! This might be a good filter for some devices but definitely not for me! I had to install an activated carbon filter.
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