Construction
Published reference1/8-inch rigid molded fiberglass or ABS plastic shaped into a pyramid, with a flat flange for lay-in installation.
Project decisionConfirm material, shell thickness, flange and support detail.
ACC-U-SOUND · Pyramidal shaped diffuser
Introduce diffusion at the ceiling grid with a defined pyramid form.
PSD is a lay-in ceiling diffuser family offered in published ABS and molded-fiberglass modules. Coordinate material, depth, grid fit, finish and optional backing.
- Placement
- Lay-in ceiling grid
- Function
- Sound diffusion
- Reference construction
- Molded fiberglass or ABS
- Project inputs
- Module · depth · material · finish · grid
PSD product role
The pyramid geometry belongs in the reflected ceiling plan.
PSD uses a molded pyramidal form with a flat perimeter flange for lay-in ceiling-grid installation.
The current source publishes one ABS size and three fiberglass sizes, plus optional 2-inch internal fiberglass on the back side. Material, depth, finish and grid module must be coordinated together.
- What it does
- Adds a pyramidal diffuser module at a suspended ceiling grid.
- What changes
- Material, nominal size, depth, finish and optional backing.
- What to verify
- Grid fit, support, acoustic intent, fire data and current product geometry.
The drawing is a typical-size reference. Confirm the selected material, module and actual dimensions before ceiling coordination.
Configuration ledger
Coordinate material, depth and grid as one module.
The ABS and fiberglass options do not share the same published sizes. Select the material before locking the reflected ceiling plan.
ABS module
Published referenceNominal 24 × 24 × 8.5 inches.
Project decisionVerify current actual dimensions, grid compatibility and finish.
Fiberglass modules
Published referenceNominal 24 × 48 × 12.5, 30 × 30 × 12.5 and 48 × 48 × 12.5 inches.
Project decisionSelect the grid module and confirm depth, weight and support.
Optional backing
Published referenceOptional 2-inch internal fiberglass is published for the back side.
Project decisionConfirm whether backing is included and obtain evidence for that exact assembly.
Finish
Published referenceWhite gelcoat / ABS with lemon-peel texture or woven 100% polyester fabric.
Project decisionConfirm current color, textile, cleaning and fire-test documentation.
Published product reference
Published selection data is material and geometry.
The nominal modules coordinate the ceiling layout. They do not by themselves establish diffusion performance for a project.
Open the PSD product PDF| Published module | Published material |
|---|---|
| 24 × 24 × 8.5 inches | ABS |
| 24 × 48 × 12.5 inches | Fiberglass |
| 30 × 30 × 12.5 inches | Fiberglass |
| 48 × 48 × 12.5 inches | Fiberglass |
No diffusion or scattering coefficient is published in the current source. Request the evidence required by the acoustic design for the selected material, size and backing.
Fire-test boundary
The source describes an “ASTM-84 Tunnel Test” and reports flame spread below 24 / Class A or I. Request the current ASTM E84 report for the selected ABS or fiberglass shell, finish and optional backing.
Application planning
Use PSD where the ceiling strategy calls for diffusion.
The source defines a lay-in ceiling product but does not publish a room-type list. Selection should follow acoustic criteria, grid coordination and plenum conditions.
Acoustic intent
- Required diffusion role
- Relationship to absorptive treatment
- Current supporting evidence
Ceiling module
- Grid size
- Pyramid depth
- Support and access
Service coordination
- Lighting and air distribution
- Sprinklers and detection
- Plenum clearances
Documents & coordination
Build a current PSD project record.
The current PSD PDF is dated by its upload path and provides a concise geometry reference. Obtain current material, support, performance and fire evidence before specification.
Request current project documentsProduct source boundary
The current PSD page and May 2025 PDF publish geometry and materials but no diffusion coefficient, scattering coefficient, NRC value, mounting-load data or frequency-specific performance table.
Selection record
Record the selected construction, dimensions, finish and mounting together. Request current acoustic, fire and installation evidence that matches that assembly.
Field coordination
Confirm field dimensions, substrate or structure, penetrations, adjacent systems, installer scope and access requirements before fabrication or procurement.
PSD questions
Clarify the assembly before specification.
Use the published information to frame product review, then verify the exact assembly and evidence with QTS.
Which PSD size is ABS?
The current source identifies the nominal 24 × 24 × 8.5-inch module as ABS. The three larger published modules are fiberglass.
Does the 48-inch drawing apply to every PSD?
No. It is a typical drawing for a 48 × 48-inch pyramid. Confirm actual dimensions for the selected material and module.
Is optional fiberglass backing included by default?
The source describes it as optional. Confirm whether it is part of the selected assembly and request matching evidence.
Does QTS publish a diffusion coefficient for PSD?
Not on the current public page or PDF. Request current supporting data if the acoustic design requires one.
What ceiling information should I send?
Provide the reflected ceiling plan, grid module, plenum depth, structure and support, services, access needs, proposed locations and acoustic criteria.
Have a PSD condition to review?
Put the pyramid into the ceiling coordination early.
Share the grid, plenum, service layout, proposed module, material and acoustic criteria with QTS before finalizing the reflected ceiling plan.