FOUR-FOLD DOORS

Hurricane Rated

FBC Approved for 65psf +/-, including approval for HVHZ. FBC #FL8446

Sallyport Security Door Systems

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.

Superior Performance

The underlying reason for selecting a Four-Fold door for any application is the need for superior performance. The alternatives; sectional overhead doors, telescoping and coiling steel doors, are often much less expensive at the initial installation but in many cases cannot hold up in service. The heavy-duty 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.

Speed

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. Four-fold door sizes range from 7’ x 7’ by 24’ x 24’, with larger sizes available for special applications. The following speeds are based on the most popular four-fold door size.

• 14‘ x 14‘ Overhead Door = 14 to 21 Seconds to Open
• 14‘ x 14‘ Four-Fold Door = Less Than 7 Seconds to Open

The high speed operation of the Four-Four door minimizes heating and cooling losses and also reduces waiting time, thus increasing productivity.

Horizontal Movement

The Four-Fold door moves horizontally rather than vertically. As a result, the door is visible throughout the opening motion. 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 & coiling steel doors which cannot tolerate any denting or deforming of the slats). In contrast, the Four-Fold door will operate with dents and similar abuse.

Maintenance

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

The Four-Fold door’s manual operation is quick and easy with the simple pull of a cord. It requires no springs under high tension or time consuming chain hoists or heavy lifting.