UL Certified Steel Fire Rated Door Viewer Model 4014-35-50-AB with 1.5 Hour Fire Protection

Technical Specifications

Parameter	Specification Details
Model Number	4014-35-50-AB
Housing Material	High-Strength Alloy Steel
Tube Diameter	14 mm
Door Thickness Range	35 mm to 50 mm
Head Diameter	32 mm
Standard Finish	AB – Antique Brass
UL Fire Rating	Certified for 1.5 Hours – 90 Minutes Fire-Resistance
Target Applications	Commercial fire-rated entryways, hotel corridor doors, and high-rise residential exit doors

Key Benefits & Target Applications

Core Hardware Advantages

• Strict 1.5 Hour UL Fire Rating: Officially tested and certified to withstand intense fire exposure for up to 90 minutes, ensuring the integrity of fire-rated doors without allowing the passage of flame or hot gases.
• Heavy-Duty Steel Construction: Unlike brass or aluminum, alloy steel features an exceptionally high melting point, allowing the viewer to maintain its physical shape under extreme fire-test temperatures.
• Expanded 32 mm Wide-View Head: The oversized 32 mm head diameter maximizes light transmission, providing an exceptionally bright, clear, and wide viewing field for building occupants.
• Classical Antique Brass Finish: Features a high-quality electroplated antique brass layer that provides superior resistance to tarnishing, scratching, and corrosion in commercial corridor environments.

Primary Application Environments

• Commercial Real Estate and Office Buildings: High-end office entries requiring certified fire-safety hardware to comply with local building regulations.
• Hospitality and Hotel Corridor Doors: Perfect fit for hotel room entry doors, offering required guest safety, fire protection, and matching classical design themes.
• High-Rise Residential Complexes: Specified for apartment entrance doors requiring mandatory fire door compliance under US and Canadian building codes.
• Healthcare and Institutional Facilities: Ideal for corridors, administrative doors, and patient rooms requiring robust, fire-safe hardware.

Custom Finishes and Accessories

We offer several electroplated finishes to match your project specifications:

Optional Finishes

• SC: Satin Chrome
• SN: Satin Nickel
• PB: Polished Brass
• CP: Chrome Plated
• G: Gold Plated
• AC: Antique Copper
• AB: Antique Brass – Standard
• ORB: Oil Rubbed Bronze

Optional Accessories

• Extension F4014J: Matching steel thread extension tube
• Cover F4014G: Matching steel privacy cover

B2B Procurement Terms

To support commercial buyers, distributors, and door manufacturing plants, we provide standard export trade terms:

• Minimum Order Quantity: Please contact our sales department for specific finish and volume requirements.
• Production Lead Time: Typically 30 to 45 days depending on the batch order size and finishing options.
• Sample Policy: Physical product samples are available for quality evaluation and thread-fit testing by qualified trade buyers.
• Incoterms and Port of Loading: FOB Ningbo, Shanghai, or Tianjin.
• Export Packaging: Shipped in standard industrial packaging. Bulk packing is optimized for easy assembly by door manufacturers and hardware distributors.
• Technical Drawings and Certifications: We provide 2D and 3D CAD files alongside official UL compliance documentation to engineering teams and door manufacturers.

Manufacturing Capabilities and Certifications

Beijing Oupuoptic Instrument Co., Ltd. began operations in 2001 in Tongzhou District, Beijing. To support large-volume global exports, we established our modern manufacturing facility, Zhejiang Guocheng Technology Co., Ltd., in Zhejiang province in 2019.

Our manufacturing infrastructure and legacy include:

• A modern production facility covering over 5000 square meters.
• A workforce of more than 100 professionals.
• Automated CNC machining, high-precision finishing, and optical assembly lines.
• Full ISO9001 quality system certification.
• Direct import and export authorization.

Our optical engineering history:
Our Chairman, Mr. Shao Wencai, is an experienced optical designer who was deeply involved in developing China’s first-generation door viewer in 1978. He patented a 180-degree wide-angle door viewer in 1990, securing a national patent. He later designed a dual-purpose door viewer in 1998, followed by an enhanced optical door viewer system in 2006.

Our specialized steel door viewer series has successfully passed strict UL fire-resistance testing, complying fully with USA and Canadian fire safety standards.

Frequently Asked Questions