Norton 7900 LH 689 Concealed Overhead Door Closer

Norton 7900 LH 689 Overhead Concealed Closer offers a seamless and sophisticated solution for door control in high-profile environments. Designed for both interior and exterior doors, this closer features a full rack and pinion type mechanism housed within a sleek 4-inch high aluminum frame header, ensuring minimal visibility and maximum security. The only visible part when the door is open is the robust one-piece arm, enhancing its vandal resistance. This non-hold open closer is adjustable for sizes 1-6, providing flexibility to meet various installation needs. It includes four to five noncritical valves for independent regulation of sweep speed, latch speed, backcheck cushioning, and delayed action closing. The hydraulic fluid is non-gumming and non-freezing, ensuring smooth operation in diverse conditions. The Norton 7900 is ideal for applications like office buildings and conference centers, where aesthetics and functionality are paramount. When paired with a door position switch (DPS), it enables remote monitoring of door status. This closer conforms to Accessibility Code specifications, making it suitable for a variety of commercial settings. Available in a matte silver finish (689/US28), it combines durability with a modern look, ensuring that it meets both form and function in any architectural design.

Overhead Concealed Closer

Overhead Concedaled Closer, Non-Hold Open, Size 1-6, LH, Aluminum

Overhead concealed closers provide an aesthetically appealing way to close a door. In situations where a closer is needed but concealment in the frame header is required or desired, the Norton 7900 closer is the ideal solution for door control. Once installed, only the solid one-piece arm is visible when the door is open; therefore, this unit provides a high degree of vandal resistance. When the door is closed, the closer, arm and slide track are fully concealed. For applications where concealment is required and security is the main concern, the 7970 should be used. The 7900 overhead closers are best suited for high-profile applications such as office buildings or conference centers. The 7970 security closers offer the necessary concealment and tamper resistance required in detention and psychiatric facilities. Used in conjunction with the door position switch (DPS) they provide the ability to monitor door status remotely.

The Norton® 7900 closer is the ideal solution for door control.

The 7900 overhead closers are best suited for high-profile applications such as office buildings or conference centers. The 7970 security closers offer the necessary concealment and tamper resistance required in detention and psychiatric facilities. Used in conjunction with the door position switch (DPS) they provide the ability to monitor door status remotely.

• Closers for exterior (and) interior doors shall be full rack and pinion type with cast aluminum alloy shell.
• Closers shall be concealed in a 4" (102 mm) high frame header.
• The slide track shall be concealed in the top rail of the door.
• Hydraulic fluid shall be non-gumming and non-freezing.
• (Closer shall be provided with a fireblocking door liner to permit installation in 20-minute wood fire door assemblies.)
• Closer shall have (four) (five) noncritical valves, hex-key operated, to independently regulate sweep speed, latch speed, backcheck cushioning (and backcheck positioning) (and delayed action closing).
• [Closers shall be sized units (4, 5 or 6)].
• [Closers shall have power adjustment to permit a 50% increase in power over the minimum closing force for any size.]
• [Closers shall have multi-sized adjustment for (interior doors)(exterior doors)].
• Closer shall conform to Accessibility Code specifications.
• Degree of stop shall be field adjustable.
• Slide track shall have a built-in cushioning shock absorber mechanism.
• (Hold open mechanism shall be capable of release when holding function is not required. Hold open mechanism shall have an adjustable range 85°-110° of door opening and shall release with a manual pressure on the edge of the door in the direction of closer).
• Closer to be Norton® [Series 7900] [Series 7970] (with Norton® #790 Fire Block).
• 7970/7970DPS shall be supplied with Torx® lobular drive fasteners having a center security pin.

Resources

• 790 Fire Bloc for 7900/7970, NHO only
• 7900 Overhead Concealed Closer
• 7900-B, 7900-CP, 7900-OP, Non-Hold Open
• LCN Closers & Auto Operators Installation Guide
• Overhead Concealed Closer Cross-Reference Sheet