The SD™ line of round mechanical dampers provides you with a Commercial grade round damper at a price that competes with residential grade dampers. The quality of materials is "second to none" and is backed up by a 5 year - Best in Industry Warranty.

Due to the low sales volume on these 3” and 4” sheet-metal dampers, a slightly different damper can may be used than the one pictured. This damper will still feature a Belimo LMB24 motor.

Features:

• Belimo LMB24-3-T 3 Wire Power Open/Power Close Brushless Motor
• True Commercial Quality
• 45 in - Ibs Torque
• Minimum Open and Close Adjustments 
• 90 second activation
• Motor will not heat up
• Can operate same as a spring return damper in Slave Zone set-up
• Rated up to 2 in. of Static Pressure
• *Heavy 22 gauge construction with 18 gauge blades. 
• *Welded, leak proof seams-not riveted. 
• *Durodyne commercial 1/2 inch drive shafts 
• *Durodyne Bronze Bearings with anti rattle washers
• *Bolted on blades with 3/16 hardware-Blades will not vibrate off!
• Duro-Dyne Direct Coupled Linkage, Bronze
• Bushings, and a 1/2 in. universal drive shaft