Dryer vent testing kit is for 29" dryers with a top mounted lint screen. Use the plastic card to hang inside your dryer drum, then run the unit three times empty. If the card stays in place, the venting and dryer need to be cleaned out. Complete instructions are included.

OEM Part - Manufacturer #W11224254

Plastic card that you hang inside your dryer drum (complete instructions are included), then run it 3 times, empty. If card stays in place venting and dryer need to be cleaned out.