Product review (5 stars): Elegant, simple, effective. Look no further!
After discovering a birds nest in my dryer vent, I purchased a cage-type cover to keep the birds out. It didn't fit, so I looked for another alternative at Amazon. I came across this one, and it works perfectly. You get two in the bag. The guard slides in easily and does the job with no tools. As a techie, I am totally geeked out by the simple yet effective design. Why spend $10 or $20 when you can get the job done this inexpensively? Don't ponder, get it.