Oh, flock it.
I've tried a couple of these "lint-trap" kits and they don't work very well. Early dryers were often non-vent models that blew the warm, moist air into the room they were installed. Homemakers complained of the wet walls & floors, and the lint-dust in every nook and cranny of the room - and house. I saw one of the "traps" at an estate sale that used a small box with cold water to condense the moisture and help trap the lint, but the entire basement looked similar to the tree above so it must not have worked very well. Some dryers are worse than others in how they deal with linty, warm air. The newer 27" Whirlpool dryers, Speed Queen In-A-Door Filter models among others were pretty lousy at keeping themselves lint-free. Norge dryers were notorious for this with their pressurized air-flow system that nearly always leaked.