YIP: BASEBOARD REGISTER MEASURE FLOOR DUCT OPENING. FLOOR OPENING MODEL 12" width x 2.5” height E15 FrooRcPENNGuEASURES: | 157 wdx 28 hod meiosis EHO 21” width x 2.6” height E120 217 width x 257 height E121 ALIGNED CORRECTLY SECURE REGISTER WITH SUPPLIED SCREWS (2) & ALIGN ALL TABS. SISTER BY HOLDING THE BACK PANE. THEN BOLL ThE DRAPER HANDLE ON THE FRONT SIMULTANEOUSLY ALIGN REGISTER OVER OR FLOOR OPENING OPEN FACE OF THE UNIT AND ALIGN WITH FLOOR OPENING.