This ducting collar is well made and looks good. The flat brim lays flush against flat surfaces, creating an airtight seal to keep particles out. It's perfect for flexible ducting. The customer service was excellent.

The construction is very robust and the quality is superior to what you typically find in big box stores. The flat brim sits perfectly flush against surfaces, creating a reliable airtight seal. The included adhesive is strong and effective. I'm so impressed that I've bought more products from the same brand.