Door Engineering

We deliver projects in the real world, which means that often our projects occur during business hours, so we have to make sure we don’t adversely impact our clients’ daily operations.

Commercial/industrial Four-Fold Doors

Door Engineering Commercial Four Fold

"The advanced design and construction of the Four-Fold door enables it to function under high cycle and other severe conditions, which create chronic service and maintenance problems for the conventional alternatives. This among its other benefits make it ideal for many applications such as Fire Stations, Parking Garages, Auto Dealerships and Grain Facilities."

Four-Fold Doors Offer:


Four-Fold doors clear the opening at an average speed of 24 inches per second. Conventional overhead and coiling doors operate between 8 to 12 inches per second. The high-speed operation of the Four-Fold door minimizes heating and cooling losses and reduces waiting time, increasing productivity and energy efficiency.A 14' x 14' Four-Fold door opens in less than 7 seconds.

Horizontal Movement

The Four-Fold door moves horizontally rather than vertically. As a result, the door is visible throughout the opening motion allowing the driver to know the precise second the doorway is clear to exit. This allows an apparatus to move quickly and safely. It is common with overhead sectional and coiling steel doors for delivery vehicles, pick-up trucks or even passenger cars to begin driving through the door opening after losing sight of the bottom of the door, only to hit the bottom panel as they move through the opening. A collision of this type will make it impossible to operate the door (especially with telescoping and coiling steel doors, which cannot tolerate any denting or deforming of the slats). In contrast, the Four-Fold door is able to operate with similar abuse.


Standard preventative maintenance (PM) on Four-Fold doors includes applying grease to hinges and operators. With general yearly PM, Four-Fold door operators and components are designed to perform over 1 million cycles. Conventional sectional and coiling doors require constant spring and cable maintenance and replacement to keep them in safe working condition. Failure to keep up with costly PM on sectional and coiling steel doors can result in door failure, which can cause both damage to equipment and injury to personnel.

Manual Operation

Manual operation is available with the Four-Fold door system. With the simple pull of a cord, manual operation is quick and easy. It requires no springs under tensions or time consuming chain hoists or heavy lifting.

Sallyport Security Door System

Four-Fold sallyport door systems are a must for high security applications. Heavy duty tube steel constructed panels are available solid sheeted, glazed with security glass or inset with security of louvers. Designed to resist forced entry, sallyport systems feature detention grade locking mechanisms, tamperproof fasteners, ballistic resistant armor sheeting options and high-speed operation to assure your facility is secure.

Other models include:

  • Hurricane Rated Four-Fold 701
  • Tornado Resistant Four-Fold 800
  • Four-Fold XT