LiftMaster 3950 3950 Addendum Manual - Page 1

ADDENDUM DOOR COMPATIBILITY FOR MODEL 3950 IMPORTANT INSTALLATION INSTRUCTIONS It is important to identify the door type before attempting an installation of the Model 3950 door operator. MOUNTING OPTIONS: 1 Standard wall mount using the brackets included with the operator. 2 Outside bracket mount using the optional mounting bracket Model 3950MB. Inside bracket mount using the optional mounting bracket Model 3950MB. 3 If standard wall mount brackets are not acceptable for installation, optional Model 3950MB mounting brackets may be required. To order visit www.liftmaster.com or contact door supplier. NOTE: The inside mounting option takes away from clear door opening. LIVE OR DEAD SHAFT DOOR IDENTIFICATION LIVE SHAFT DOOR - The axle rotates with the drum and door assembly when the door is opened or closed. DEAD SHAFT DOOR - The axle is locked in place while the door opens and closes. Rotating Axle Fixed Axle Live Shaft Door Figure 1 - Door Type Identification Dead Shaft Door