TBD4 - Supply

Product Information

View Performance Data TBD4 - Supply

3/4" (19) Slot Width
Non-Insulated TBD475
Insulated TBDI475
1" (25) Slot Width
Non-Insulated TBD4100
Insulated TBDI4100
1-1/2" (38) Slot Width
Non-Insulated TBD4150
Insulated TBDI4150

Price TBD4 Series T-bar diffusers have been designed to provide a tight horizontal air pattern that is suitable for VAV systems. The air pattern is field adjustable toward or away from the diffuser inlet side.

For Fire-Rated applications see Series TBD4-FR.


  • Available in 1 and 2 slot types (standard); 3 and 4 slot units are an available option as a special order.
  • Available in both imperial and hard metric module sizes.
  • Available standard module lengths – 24"/600mm, 30"/750mm, 36"/900mm, 48"/ 1200mm and 60"/1500mm.
  • Pattern controllers are fitted with a tight sealing extruded vinyl blade edge seal.
  • 2 slot units feature an extruded aluminum center T that has been "dropped" below the diffuser face to match the ceiling grid and provide superior performance.
Available Options
  • Center notch (CN) available to bisect diffuser length (i.e. allows 48" (1219) unit to be installed into two 24" (610) ceiling modules.
  • Straddle mounting (ST) available.
  • Factory installed outer
    T-Bars (TB1 / TB2).
  • Factory installed T-Bar clips (TC1 / TC2).
  • Internal fiber free foam or coated fiberglass insulation.
  • External aluminum foil backed fiberglass insulation.
  • Aluminum Plaster Frame (APF)

    Product Selection Checklist

  1. Select Inlet Diameter based on system design or duct requirements.
  2. Select Module Length based on ceiling module.
  3. Select Outlet type by model number (Slot width, insulation).
  4. Select Number of Slots.
  5. Select Integral Options if desired.
  6. Select Finish (center T only)

Example: 8 / 48 / TBD475 / 2 / B12


  • Shell - Coated Steel
  • Pattern Controller / Center T - Extruded Aluminum
  • Blade Gasket - Vinyl




Plenum Face / Pattern Controller - Black


Center Tee - White Powder Coat


For optional and special finishes see
color matrix.

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