(STC) Sound Transmission Control Doors

Starting at  $2500*
Nationwide Delivery

(STC) Sound Transmission Control or Acoustical doors are sound rated doors used to reduce or eliminate unwanted noise. STC rated doors provide privacy and prevent noise distraction. These doors are typically used in schools, conference rooms, buildings near airports, recording studios, government/military facilities or any other building where sound control is important.

  • Levels 43 to 52 Available
  • Tested in Accordance with ASTM E90-09
  • Includes Frame and all Required Seals and Threshold

*Includes Frame and all Required Seals and Threshold – Hardware Not Included


Product Overview

Heavy-duty Sound Transmission Control Steel Door and Frame Systems

Take control of your environment and reduce unwanted noise with acoustical (STC rated) doors and frames. Acoustical performance of building products, components, and systems is an important consideration for engineers, specifiers, and building owners. This is especially true in highly populated cities, areas around highways, railroads, airports, and high density residential zones. The demand for efficient noise control in these areas is rising constantly.


  • Single flush doors are available up to STC 52
  • All required seals and a threshold are included
  • Tested in accordance with ASTM E90-09
  • Factory-applied rust-inhibiting primer (no special color options)
  • Fire-rated up to 3 hours with WHI / ITS label applied (optional)
  • Brands include DCI and Republic



STC Rating Class Table

Door Type
Standard Hollow Metal Door
Normal speech can be understood quite easily
STC Rated Metal Door
Loud speech can be distinguished; normal speech barely heard or inaudible
STC Rated Metal Door
Loud speech is audible but words hard to distinguish
STC Rated Metal Door
Loud speech is barely audible
STC Rated Metal Door
Very loud sounds are faintly heard

DCI Sound Transmission Control (STC) Door Video


16-Gauge Steel Face Sheets - Cold Rolled or Galvannealed

Core Type

Proprietary Sound Core

Door Thickness

1-3/4" Standard


Up to 4'0" x 8'0"


Certified ASTM E90 and ASTM E413


Up to 90-Minutes - STC 53 for singles and STC 48 for pairs


Factory-Applied, Baked-On, Rust Inhibiting Gray Primer (No Special Color Options) – Not intended to be a finish coat. It is recommended that finish paint (top coat) be applied after installation

Buy American Act Compliance

Meets Buy American Act – Made in USA


DCI, Republic

Mfg. Hinge/Lock Locations

Steelcraft, Mesker, Ceco, Curries, Republic, Baron, Pioneer, Deansteel, Custom Locations