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1540/1540D — Insulated Step-Down Ceiling Diffuser

How to Specify

Provide the following information:

  • Model number
  • Diameter
  • Finish

1540/1540D — Insulated Step-Down Ceiling Diffuser

Assets/Details

Submittal Data (181 KB, PDF)
Engineering Data (127 KB, PDF)
  • Provides high air volume delivery in a four-way air diffusion pattern.
  • Four-cone design, fixed core, optional damper control access (damper ordered separately), and 2” high collar for easy flex connections. 
  • Molded fiberglass back meets or exceeds the following:
    • ASTM E84 Flame and Smoke Test
    • UL181 Erosion and Impact Test
    • “R” Value of 6
    • RR7811 Approval for Los Angeles
  • Collar sizes available: 6", 8", 10", 12", 14". 
  • Model 1540D available with butterfly damper installed.
  • Use with AL10PF plaster frame for surface-mount applications
  • All steel construction. Formed steel back panel with molded fiberglass insulation cover. 
  • Bright White finish standard.

 1540/1540D - Insulated Step-Down Ceiling Diffuser - Dimensional Drawing