- Author
- Underwriters Laboratories, Incorporated
- Title
- Ceiling Dampers for Use in Floor and Ceiling Constructions. Airstream Products Co., Inc., Philadelphia, Pennsylvania.
- Coporate
- Underwriters Laboratories, Inc., Northbrook, IL
- Report
- File R6679-1; Assignment 70NK3562, May 7, 1971, 29 p.
- Keywords
- dampers | ceilings | floorsYl properties | construction | air ducts
- Abstract
- The object of this investigation was to detemine the acceptability of using and listing the submittor's spring-loaded, sliding-blade damper in lieu of hinged door dampers or mineral and fiber board types of air duct protection which are presently used in fire rated floor and ceiling assemblies.