I've been tirelessly trying for a month to evict the small moths that were occupying my newly constructed apartment. Pesticides didn't work. Upon further inspection and trial and error it seemed the moths were coming through the vents. After installing this wire mesh over all the vents (or in some cases inside depending on the vent), I have been moth free for four days which is a huge accomplishments considering I was killing a few a day for a month. It also seems to be keeping out the gnats. I've tested out heating and air conditioning and notice no change in quality. I wasn't able to cut the material with my cheap pliers/wire cutters combo tool but was able to cut it with kitchen shears. Very sturdy and stays in place in the vent. 100% worth the money. Shipped fast. Would buy again.
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