Repair Information - Johnson Controls - LIT-1900638 - LIT-1900638

SD-1250 Smoke Dampers Catalog Page

Brand
Johnson Controls
Product name
LIT-1900638
Document type
Catalog Page
Document number
LIT-1900638
Revision date
2021-03-10
Language
English

If the SD-1250 Smoke Damper fails to operate within its specifications, replace the unit. For a replacement SD-1250 damper, contact the nearest Johnson Controls® representative.

Smoke dampers have round or oval connections for low or medium pressure.

Round connections are a minimum of 4 inches in diameter. The rectangular size of the damper is 2 inches larger than the connection dimension ordered.

Smoke dampers supplied with oval connections are a minimum of 6 inches wide x 4 inches high. The rectangular size of the damper is 2 inches larger than the width and height of the connection dimensions.

Note: The maximum dimension of the transition is 70 x 94 inches.
Figure 1. Transitions