Caulk all around with acrylic caulk. There are two good ways to install dryer vents through vinyl siding. The first is to install a vinyl surface mounting block (shown here) that fits over the ...

“If your home has vinyl siding, then you’ll need to cut a hole through it to install the dryer vent. This can be a challenge as a hole saw’s teeth can easily tear the siding. Here’s a ...