The Model 3900 is a jackshaft door opener, as manufactured by The Chamberlain Group, Inc. and is for use on light-duty commercial standard, vertical and high lift sectional doors with torsion assemblies. The Model 3900 is a jackshaft door opener, as manufactured by The Chamberlain Group, Inc. and is for use on light-duty commercial standard, vertical and high lift sectional doors with torsion assemblies. It is rated up to 10 cycles per hour during peak periods. Liftmaster Model 3800 3800P 3800PLD 3900 Wall Mount Opener. LiftMaster Model 3900. The Model 3900 is a jackshaft door opener, as manufactured by The Chamberlain Group, Inc. and is for use on light-duty commercial standard, vertical and high lift sectional doors with torsion assemblies. 3900 Liftmaster Garage Door Opener Light Duty Commercial Includes 1-371LM Remote - - Amazon.com ... Model 8900W is a light-duty jackshaft operator for light-duty commercial sectional applications only. 3900. Model 3900 is a light-duty jackshaft operator for light-duty commercial sectional applications only. Both openers boast a soft start/stop mechanism. LiftMaster LJ8900W Light-Duty Commercial Jackshaft Operator w/Built-In Wi-Fi for Sectional Doors. Color. It features a compact design ideal for limited height, cathedral, or obstructed ceiling installations. Model. Garage Door Opener. It is rated up to 10 cycles per hour during peak periods. More items related to this product. It is rated up to 10 cycles per hour during peak periods. Light-Duty Commercial Jackshaft Operator for Sectional Doors Model 3900 is a light-duty jackshaft operator for light-duty commercial sectional applications only. It features a compact design ideal for limited height, cathedral, or obstructed ceiling installations. However, even with a smaller size, the Liftmaster 3900 is heavier than the 8500 model. item 1 LIFTMASTER 8900W LT DUTY COMMERCIAL Garage Door Opener with WIFI LJ8900W, 3900 - LIFTMASTER 8900W LT DUTY COMMERCIAL Garage Door Opener with WIFI LJ8900W, 3900. The Liftmaster 3900 features a more compact design, which is relatively smaller as compared to the 8500. Garage Door Opener. Part Type. Dark Slate Gray. Start & Stop Function. Garage. Show More Show Less. Room. It features a compact design ideal for limited height, cathedral, or obstructed ceiling installations. Type. The Model 3900 is a jackshaft door opener, as manufactured by The Chamberlain Group, Inc. and is for use on light-duty commercial standard, vertical and high lift sectional doors with torsion assemblies. LiftMaster LJ8950W Light-Duty Commercial Jackshaft Operator w/Built-In Wi-Fi for Rolling Doors. LiftMaster Model 3900 Light-Duty Commercial Jackshaft Operator for Sectional Doors . It is rated up to 10 cycles per hour during peak periods.