Overview

The Ningbo Dimon Commercial Fire Door Passage Mortise Latchset is a heavy-duty non-locking architectural latchset engineered for commercial corridors, fire stairwells, hospital hallways, utility access rooms, and building emergency egress paths. Compliant with fire compartmentalization codes, it provides positive latching to hold fire doors securely against air pressure and smoke while allowing free, uninhibited passage from both sides without requiring keys or turn-knobs. Constructed with a heavy-gauge steel mortise latch case and grade 304 stainless steel safety lever trim, it withstands punishing high-traffic commercial environments.

Key Features

• Positive Latching Fire Door Compliance: Meets fire-rated door positive latching mandates, automatically keeping fire doors closed to prevent smoke and flame migration while permitting free two-way egress.
• Dedicated Passage Function (Non-Locking): Free operation at all times from interior and exterior sides—ideal for high-traffic corridors, public walkways, and exit corridors where locking is prohibited.
• Quick-Reversible Solid Latch Bolt: Beveled stainless steel latch bolt is fully field-reversible in seconds with a simple screwdriver push, easily adapting to Left-Hand (LH) or Right-Hand (RH) swinging doors.
• Return-to-Door Commercial Safety Levers: Ergonomic U-shaped round-bar lever handles curve smoothly back toward the door face, preventing fire hoses, clothing, and medical gear from snagging during evacuations.
• Heavy-Duty Steel Chassis & Spindle: Heavy-duty cold-rolled steel latch case paired with a solid steel drive spindle and spring-loaded rosette chassis eliminates handle drooping or mechanical play over years of heavy use.
• Clean Minimalist Rose Escutcheons: Features clean round rose trims without cylinder cutouts, creating a sleek modern appearance on hollow metal and architectural wood doors.

Technical Specifications

• Product Type: Commercial Passage Mortise Latchset (Fire Exit Aisle Latch)
• Trim & Faceplate Material: Grade 304 Stainless Steel (Grade 201 optional)
• Latch Body Material: High-Strength Galvanized Cold-Rolled Steel
• Function: Passage / Egress (Non-Locking, Free Lever Both Sides)
• Latch Type: Field-Reversible Beveled Roller/Spring Latch Bolt
• Lever Design: Commercial Safety Return Lever (U-Shaped Round Bar)
• Door Compatibility: Fire-rated hollow metal doors, commercial steel doors, solid-core timber passage doors
• Compatible Door Thickness: 40 mm – 55 mm (approx. 1-1/2" to 2-1/8")
• Included Accessories: Mortise passage latch body, pair of stainless steel safety levers with rose trim, strike plate, dust box, square spindle, and all mounting through-bolts

Wholesale & OEM Capabilities

• Material Options: Grade 304 for wet, exterior, or high-humidity facilities; Grade 201 for standard interior commercial fitouts.
• Trim Finishes: Brushed Satin Stainless Steel (US32D), Electrostatic Matte Black, and Architectural Gunmetal Gray.
• Custom Backsets & Dimensions: Available in standard 55mm / 60mm backsets to match architectural door prep schedules.
• Master Export Packaging: Individual protective foam packaging with illustrated installation templates and reinforced corrugated master export cartons.
• Direct B2B Supply: Factory-direct wholesale pricing from Ningbo Dimon, flexible MOQs, and reliable ocean/air container shipping worldwide.