The document defines and describes various terms related to ceilings, lighting, and fire protection in buildings. It includes definitions for terms like acoustic, which refers to the science of sounds; ceiling joist, which is the structural member that holds the ceiling board; and gypsum board, which is a board made of plaster with a paper covering. It also defines terms like insulation, which obstructs the passage of sound, heat, or cold; reflected ceiling plan, which is a drawing looking down at an interior ceiling; and sprinkler systems, which discharge water when effects of a fire are detected.

3. 1. ACOUSTIC
•IS THE SCIENCE OF SOUNDS
IN HOUSING, MATERIALS
USED TO KEEP DOWN
NOISE WITHIN A ROOM OR
TO PREVENT IT FROM AN
OVER HEAD LINING INSIDE
OF A ROOM

4. 2. CEILING JOIST
•IS THE STRUCTURAL
MEMBER IN BUILDING
CONSTRUCTION THAT
HOLDS THE CEILING
BOARD

5. 3. CEILING BOARD
•IS A CEILING
COVERING
MATERIALS

6. 4. CORNICE
•IS A WOOD OR ANY
MATERIAL PROJECT
BEYOND THE WALL
OF THE CEILING

7. 5. FIXTURES
•IS A PIECE OF
ELECTRIC OR
PLUMBING
EQUIPMENT WHICH
IS A PART OF THE
STRUCTURE

8. 6. GYPSUM BOARD
•IS A BOARD MADE
OF PLASTER WITH
COVERING OF
PAPER

9. 7. HANGER
•IS AN IRON OR
WOOD STRAP
USED TO
SUPPORT A JOIST

10. 8. INSULATION
•IS A MATERIAL
OBSTRUCTING THE
PASSAGE OF SOUND,
HEAT, OR COLD
FROM ONE SURFACE
TO ANOTHER

11. 9. LIGHTING FIXTURES
•IS THE POSITION
OR PLACEMENT OF
LIGHTING FIXTURES
OF THE HOUSE

12. 10. REFLECTED CEILING PLAN
•IS A DRAWING OF A
ROOM OR
BUILDING, LOOKING
DOWN AT THE
INTERIOR CEILING

13. 11. SMOKE DETECTORS
•IS A FIRE PROTECTION
DEVICE THAT IS USED
TO DETECT SMOKE OR
GASSES PRODUCED BY
SMOLDERING FIRES
PARTICLES OF
COMBUSTION

14. 12. SOFFIT
•IS THE
UNDERSURFACE OF
A CORNICE,
MOLDING, OR BEAM

15. 13. SPECIFICATION
•IS THE WRITTEN DESCRIPTION
ACCOMPANYING THE WORKING
DRAWING

16. 14. SPRINKLER SYSTEMS
•IS A FIRE
PROTECTION DEVICE
THAT DISCHARGES
WATER WHEN THE
EFFECTS OF A FIRE
HAVE BEEN DETECTED

17. 15. VENTILATION
•IS THE PROCESS OF
SUPPLYING AND
REMOVING AIR BY
NATURAL OR
MECHANICAL MEANS
TO OR FROM ANY
SPACE