Technical Specifications - Johnson Controls - LIT-1900638 - LIT-1900638

SD-1250 Smoke Dampers Catalog Page

Johnson Controls
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All leakage rated smoke damper systems are cycled prior to shipping. Actuators should be field-wired together so the smoke damper assembly operates as one assembly.

Table 1. Parts and Contruction
Part Construction


5 in. deep x 16-gauge galvanized steel or aluminum


SD-1250: One-piece 6063T5 extruded aluminum, airfoil shape

All blades are 6 in. nominal width and 8 in. maximum width.


Concealed in the frame

Blade Pin

1/2 in. plated steel hex


Stainless steel

Side Seal

Flexible metal compression, stainless steel

Blade Seal

Extruded silicone


20-gauge galvanized steel, 20 in. long (optional)

Side Plate

16-gauge galvanized steel

Table 2. Technical Specifications
Specification Description

Maximum Dynamic Rating

4 in. w.c. static pressure at 2,000 fpm

Ambient Operating Temperature

-40°F to 200°F (-40°C to 93°C)

Electrical Power Input

120 VAC ±10%, 60 Hz

24 VAC +20%, -10%, 50/60 Hz

Electrical Power Consumption

120 V - Running: 0.18 A, 23 W, Holding: 0.13 A, 9 W maximum

24 V - Running: 23 VA, Holding: 8 VA maximum

Modulating Control Signal

0 to 10 VDC or 4 to 20 mA


Drive open: 15 to 25 seconds typical

Spring close: 15 seconds typical

Maximum Short Duration Operating Temperature

250°F or 350°F (121°C or 177°C) based on actuator selected

Pressure Drop (inches WG) - Fully Open

1,000 fpm

2,000 fpm

24 inches x 24 inches



36 inches x 48 inches



Field Installed Accessories


Field Replace Parts

SP100 position switch kit (DMPR-KC013 or DMPR-KC014)

Actuators are field replaceable, refer to model number of actuator mounted on damper to order direct replacement.

Approximate Weight

7 lb/sq. ft

Note: Dampers are tested at an AMCA Certified Laboratory using instrumentation and procedures in accordance with AMCA Standard No. 500-89, Test Methods for Louvers, Dampers, and Shutters.
Note: All Johnson Controls Dampers are built to order, just in time, and cannot be returned due to customer ordering errors. All dampers are backed by a 3-year warranty, that covers defects in materials or workmanship when used in our defined applications. Refer to terms and conditions of sale for specifics.