"Thanks for the seamless exchange. I received the unit yesterday & will install it today. So far, I am simply using an interference fit as they all fit snugly on the lead flashing. I may shorten them some, but otherwise, they are just what we needed."
A FLutz, FL
"I did have one that I had to work on so that the screws would grab the vent. Turns out one of the six vents was too short for the pre-drilled holes, so I had to lower the screws. It was fine after that."