Single Leaves UL Metal Fire Door | YK Fire Door Supplier

As a leading fire door manufacturer in China, YK Door Industry Co., Ltd. specializes in high-performance single leaf steel fire-rated doors certified with UL listings. These doors are engineered to provide exceptional protection in commercial, educational, and residential environments, meeting rigorous standards such as UL 10(b), UL 10(c), and NFPA 252.

Precision Engineering Meets Certified Fire Resistance

 

Our UL Listed Single Leaf Metal Fire-Rated Door is constructed from premium cold-rolled or galvanized steel and designed to withstand fire exposure for up to 180 minutes. With WHI, FM, and UL certifications, each door ensures reliable fire containment, adhering strictly to SDI fabrication standards.

Key specifications include:

• Fire rating: 45, 90, and up to 180 minutes

• Leaf thickness: 1 ¾” (44.5mm)

• Material options: Cold-rolled steel, galvanized steel, or galvannealed steel

• Core materials: Mineral fire board, honeycomb, or polystyrene

• Finish options: Primer, powder coat, or wood grain

• Vision panels and louvers: Optional UL-rated wire glass or fire louvers

• Door sizes: Width up to 4’0” (1200mm) and height up to 8’0” (2440mm); customized sizing available

By integrating fire-resistant door materials and ANSI-standard hardware reinforcements, YK fire doors combine safety with structural integrity.

UL Fire Door Ratings: Why They Matter

The UL fire door rating determines how long a door can withstand intense heat and flames while maintaining structural stability. Our single steel fire doors are tested under both UL 10(b) (neutral pressure) and UL 10(c) (positive pressure) to simulate real-world fire scenarios. Ratings such as 90-minute fire-rated door or 3-hour fire door help specifiers and building owners choose doors that comply with international fire codes.

Single, Double, and Unequal Leaf Fire Doors: Key Differences Explained

When choosing the right UL certified fire-rated door, understanding the structural differences between single leaf, double leaf, and unequal leaf doors is critical for both functionality and code compliance.

🔹 Single Leaf Fire-Rated Door

A single leaf fire door consists of one panel that swings open in one direction. It’s commonly used in corridors, offices, and residential units where space is limited. YK’s UL Listed single leaf metal doors offer:

• Compact design

• Easier installation

• Up to 3-hour fire resistance

Long-tail keyword example: UL certified single swing steel fire door

🔹 Double Leaf Fire-Rated Door

A double leaf fire door has two equal panels that can open simultaneously, ideal for wider openings such as hospital corridors, school entrances, and commercial exits. Both leaves may be active, or one can be fixed based on access needs.

Key features:

• Wider opening clearance

• Balanced aesthetics and fire integrity

• Available up to 8’ x 8’ (2440 x 2440mm)

Long-tail keyword example: fire rated double door with UL certification

🔹 Unequal Leaf / Active-Inactive (子母门) Fire-Rated Door

An unequal leaf fire door, also known as a single active with one inactive leaf or parent-child fire door, features two panels of different widths. The larger active leaf is used for regular access, while the smaller inactive leaf remains closed but can be opened when needed.

Applications:

• Utility and mechanical rooms

• Data centers and control rooms

• Where flexibility in access width is required without compromising fire protection

What You Gain with Single Leaves UL Metal Fire Door:

• Code compliance across commercial buildings

• Peace of mind during emergencies

• Reduced liability risks

• Improved building insurance qualification

Smart Design, Versatile Applications

YK’s steel fire doors are suitable for a wide range of interior and exterior uses:

• Schools and educational institutions

• Commercial offices

• Healthcare and public buildings

• Residential complexes

• Industrial facilities

You can choose from flush panel, vision lite, 2-panel, or 6-panel configurations to match architectural aesthetics while meeting safety requirements.

Durability & Performance in Every Component

All hardware and accessories—such as UL fire-rated hinges, SS304 ball bearing locks, door closers, fireproof rubber seals, and panic bars—are tested and certified. Optional features like electromagnetic locks or custom louvers enhance functionality.

Popular Long-Tail Keywords Optimized:

• UL Listed fire-rated door manufacturer

• Steel single fire resistance door

• UL certified fire door supplier

• 90-minute single leaf fire door

• Commercial fireproof metal doors

Conclusion: Choose YK for Certified Fire Protection

With over a decade of expertise in fire protection building materials, YK Fire Door Supplier is committed to delivering high-quality steel fire-rated doors with global certifications and customizable options. Our UL listed single leaf metal fire doors are crafted to protect life and property while enhancing architectural integrity.Single Leaves UL Metal Fire Door.

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Contact YK Door Industry Co., Ltd. today for a tailored quote or to request technical documentation.