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RETROZONE Belimo LMB DAMPER Manufactured by RetroZone Inc, this Heavy Duty round Damper is a 3 wire round damper at a price that competes with residential spring return dampers. We can sell this damper at this price because we are the manufacturer, there is NO MIDDLEMAN on this product! The quality of material is the best available and is backed up by a 5 year - Best In Industry Warranty. The industry leading Belimo LM24-3-T Power Open / Power Close 3 wire motor that drives this damper has 45 in-lb's of torque which is twice the amount of strength found in dampers similarly or even higher priced, yet uses far less power than spring return dampers. RetroZone sells this damper to A/C contractors and wholesalers all around the U.S. Works with almost all zone control panels including Honeywell, Trol a Temp, Aprilaire, Research Products, Robert Shaw, Jackson Controls, Ztec, Lennox, Waterfurnace, and almost all other brands of 24vac zone control panels. Even if your zone panel has just a two wire damper output, you can still use this superior, non spring return damper! Also ties directly to a thermostat with out a relay, something most other 3 wire dampers will not do. Also see our Super Duty powered dampers, same Belimo motor, in our store damper direct. FEATURES INCLUDE: 24vac powered and works with almost all zone control systems and thermostats, no matter what brand, with technical support by phone or email, and an industry leading 5 year warranty. Can be modulated, damper blade will not move when de-powered. Belimo LM24-3-T Brushless 3 wire Power Open / Power Close Motor Very efficient: one 40va 24volt AC damper powers 20 or more dampers Reinforcing Beads for Heavy Duty Strength. Blades can't come off -no cheap spot welding! Uses only 2va of power for 90 seconds opening and closing time, compared to 8 to 10 va continuous power on spring return dampers.