Elephant Doors – Sliding Acoustical Doors

Acoustical doors are constructed much differently than most other hollow metal doors and other popular styles. Acoustical doors are designed to provide consumers with the best possible product for reducing sound transmission.

While acoustical doors are not completely soundproof, with the proper design for your space and the use of proper hardware, you can eliminate most of the noise that you are currently losing through your doors. There are also many great acoustical products such as hardware and seals that help you get the most out of specialty acoustical doors.

Specialty Doors has provided acoustical doors for both sliding and swing applications up to 53 S.T.C. at savings of up to 50% to our customers. Our customers are surprised at our level of Acoustical knowledge and how our price and delivery can beat the competition.

Elephant Doors, Stage Doors, Sliding Sound doors

Sliding Acoustical Doors, Elephant Doors

Large acoustical sliding doors are sometime called “Stage Doors” or “Elephant Doors”.

These are used when a swinging hinged door is not practical because of its size, but the sound needs to be controlled.

We have sold these systems all over the world and continue to do regular quoting.

The vast majority are electrically operated due to their size.

The most common sizes run around 18′ x 20′ or higher.


Our Sound Transmission Class (STC) is around 53, which is excellent performance on this job.

Being located in Southern California, the movie capitol of the world, we were a natural to supply the studios with what the industry calls “Elephant Doors”.

To date, we have supplied acoustical sliding doors to all the major studios, including Disney Studios, Warner Brothers, Culver Studios, Manhattan Studios, and Paramount Studios.

One of the reasons for our world wide success with acoustical sliding doors is how the operator and door panels are engineered to work as an integrated system.

The electric operator drives a roller chain that is concealed in the track, so no visible chain or cable is exposed.

Our panels are shipped in 4 to 5 foot widths so they are easier to handle and install at the site.

The larger the sliding door, the better for us.

30′ to 40′ high is not out of our scope of work.

We also provide constant pressure key switches, relays, safety edges, or any other control required.

The sounds test we have preformed at the job site have exceeded our expectations and in some cases, tested higher than in the lab.

Years ago, sound stages used doors made up of 8″ of concrete and 4″ of instaquilt.

These were extremely heavy and if a problem occurred, even a forklift would not move the door.

Our style test better acoustically than concrete doors did and if there is a power failure, they can be manually operated with little effort.

We often supply acoustical swinging doors with frames, hinges, and gaskets to complete a sound door requirement for our customers.

The sound rating we achieve is 53 STC with a 1 3/4″ door panel and frame.

We have also provided curved or radius hardware in both manual and electrical operation.

We have come to be known as the company that can do anything that slides.

Elephant Door Acoustical Test Video

This video’s sound was not edited. This is the actual sound as it was recorded.

After completing the installation of an “elephant door”, which measured 18′ wide by 20′ high, the owner of the studio requested actual acoustical documentation of his door on site.

Huge speakers were used to concentrate “pink noise” which sounded similar to a jet engine.

The test was conducted on June 20, 2013. The results were better than expected.

On the studio side, the NIC, Noise Isolation Coefficient, was 50.

That’s about the same as an 8″ brick wall. (Higher numbers are better.)

On the warehouse side, it was just over 47 NIC because of nearby traffic noise.

Acoustical data is available upon request.

This system was electrically operated, using 53 STC, Sound Transmission Class, steel panels. The panel thickness was 3.5 inches.

The entire system used double acoustical seals around the full perimeter of the movable element.

This system has been used by many Hollywood studios, as well as the world’s largest sound stage in New Mexico.

A typical size is 20′ X 20′, however we have completed some systems as tall as 40′.

Sliding Acoustical Doors

Sliding Acoustical Doors

Sliding acoustical doors or “Elephant Doors” are a great option for people that want the benefits that come from acoustical doors but need a sliding implementation in order for the doors to work with their space.

The good news is that there are some great options for customizing sliding acoustical doors, which makes it easy to implement them into your facility. For larger openings we proved electric operators and necessary controls.

Our customers include:

  • Disney Studios
  • Boeing Aircraft
  • Northrop
  • Culver Studios
  • Cal State University
  • Nokia Theatre
  • Paramount Studios
  • Kennedy King University
  • Schools
  • Hospitals

Swinging Doors

swinging doors

  • Innovative Metal Acoustical Doors and Frames
  • Innovative Acoustical Metal Windows
  • Stainless Steel Acoustical Doors, Frames and Windows
  • Wood Acoustical Doors

Swinging acoustical doors provide consumers with a great option for spaces that do not allow for sliding doors. There are also many customers who do not like the style of sliding doors, making swinging acoustical doors the perfect alternative. Luckily, just like the other styles of acoustical doors, these products also allow for customization and can be designed to fit your space perfectly.

Standard Door Features

  • Welded Seamless Edges
  • Hot Dipped Galvanized Face Sheets
  • UL Rates up to 3 Hours
  • Baked on Prime Paint
  • 3/16″ Hinge Reinforcements
  • 12 Gauge Closer Reinforcement
  • Available in 18, 16, 14 & 12 Gauge
  • Flush Top Channels at Exteriors
  • Baked Enamel Finish Available

Standard Swinging Acoustical Doors

Steel Acoustical Doors

Steel Acoustical Doors Steel Acoustical Doors 2

There are many benefits that come with utilizing steel acoustical doors. Perhaps the biggest benefit is the fact that they provide the best soundproofing quality with sound ratings up to 53 S.T.C. This is the reason that people requiring the best in acoustical soundproofing decide on steel acoustical doors over other models. However, many people also prefer the look of steel doors as they are much easier to finish and require very little maintenance.