We've had problems with those pesky yellow-shelled hornets getting into the outer tube and trying to nest here. We spoke to our installer and he suggested we buy them. Tried it at a local store, out of stock. They were with the seller Revain. Fits perfectly, no more problems with those pests. The air flow is not blocked. A great permanent solution to a problem that can lead to those pesky yellow-skinned hornets infiltrating our heating system and eventually our home.
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