You can find the name of your machine on the physical unit or on a sticker under the unit. You may also click this link, scroll down, and see which machines are affected by the recall. Phillips Recall Information
You can find your serial number on the label on the bottom of your unit. It is the letters and numbers that follow the SN or S/N on the label. Locating Serial Number
A Registration Number was provided to you by Philips via email or phone if you registered your unit through the Philips Registration Portal. If this process is incomplete, please complete it first. Phillips Recall Registration
Recall & Updates | Respironics Registration | Respironics Update