Von Duprin 5575F-4ft Fire Rated 4ft Narrow Stile Crossbar Mortise Lock Exit Device Less Dogging

Von Duprin 5575F-4ft Fire Rated 4ft Narrow Stile Crossbar Mortise Lock Exit Device Less Dogging

Classic Crossbar Design with Commercial-Grade Mortise Lock Performance

The Von Duprin 5575F-4ft is a fire-rated, narrow stile crossbar mortise lock exit device from the trusted 55 Series, engineered for 4' x 10' (1219 mm x 3048 mm) single or 8' x 8' (2438 mm x 2438 mm) double metal doors. UL listed for up to 3-hour labeled fire installations, this device fits door stiles as narrow as 4-3/4" (121 mm) and is specified for 2-1/4" doors. The 7500 mortise lock features a 3/4" (19 mm) anti-friction latch bolt that is field reversible without removing the lock from the door, along with a non-handed auxiliary bolt for deadlocking and a faceplate with an adjustable bevel. Wood door installations require the 589 cover plate. Certified to ANSI/BHMA A156.3, 2008 Grade 1 standards, this device delivers reliable, code-compliant egress performance for demanding commercial environments.

Professional Features & Benefits

• Narrow Stile Compatibility: Fits door stiles as narrow as 4-3/4" (121 mm), specified for 2-1/4" doors, making it ideal for narrow stile metal door applications.
• Fire-Rated Construction: UL listed for up to 3-hour labeled fire installations per ANSI/UL 10C and CAN/ULC-S104, ensuring compliance with the most demanding fire egress requirements.
• Door Size Coverage: Designed for 4' x 10' (1219 mm x 3048 mm) single or 8' x 8' (2438 mm x 2438 mm) double metal doors, providing versatile coverage for a wide range of commercial openings.
• Field-Reversible Mortise Lock: The 7500 mortise lock includes a 3/4" (19 mm) anti-friction latch bolt that is field reversible without removing the lock from the door, simplifying installation and handing adjustments.
• Deadlocking Auxiliary Bolt: Non-handed auxiliary bolt provides positive deadlocking for enhanced security, paired with a faceplate featuring an adjustable bevel for precise door fit.
• ANSI/BHMA Grade 1 Certified: Meets ANSI/BHMA A156.3, 2008 Grade 1 certification along with ANSI/UL 305 and CAN/ULC-S132, confirming top-tier performance and code compliance.
• Flexible Configuration Options: Available with optional E8875 electrified option for access control or fire alarm integration, RX switch for door monitoring, and KN knurling for tactile hazard warnings on crossbars.
• Classic Narrow Stile Design: The 55 Series crossbar design is commonly used in retro-inspired architecture and historical buildings, offering both aesthetic appeal and functional reliability.

Technical Specifications

• Product Group: Exit Devices and Trim
• Series: 55 Series
• Grade: Grade 1
• Fasteners: Screw pack for 1-1/4" and 2-1/4" thick medal/wood doors.
• Product Subgroup: Exit Devices - Mortise
• Product Type: Exit Devices - Mortise
• Subcategory: Mortise Exit Devices
• Latch Throw: 1/2"
• Commercial/Residential: Commercial
• Stile Type: Narrow Stile
• Door Hand Direction: Field Reversible
• Door Thickness Range: 1-3/4"
• Product Size: 48"
• Dogging Configuration: Hex Key Dogging
• Product Dimension: 7-1/4" x 1-1/4" x 2-1/4" (Hinge Stile Case), 7-1/4" x 1-1/4" x 2-1/4" (Lock Stile Case)
• Fire Rating: Yes
• Product Projection: 3-3/4"
• Product Style: Cross Bars
• Product Category: Exit Devices and Trim
• Department: Door Hardware

Professional Applications

• Commercial Office Buildings
• Educational Facilities
• Healthcare Institutions
• Retail Establishments
• Industrial and Warehouse Facilities
• Government and Municipal Buildings
• Historical and Retro-Inspired Architecture

Why Choose Von Duprin Quality?

Von Duprin 55 Series mortise exit devices are engineered to meet ANSI/BHMA A156.3, 2008 Grade 1 certification and are UL listed for up to 3-hour fire-rated installations per ANSI/UL 10C and CAN/ULC-S104, ensuring dependable performance in the most demanding commercial and fire egress applications. The field-reversible 7500 mortise lock with 3/4" anti-friction latch bolt and non-handed auxiliary deadlocking bolt reflects the precision engineering Von Duprin is known for. Engineered for commercial environments where code compliance, fire safety, and long-term reliability are non-negotiable.