Non-Insulated Fire Window

Updated: 2026-09-17

Overview

Non-Insulated Fire Windows are passive fire protection systems that maintain structural integrity during fires while allowing light transmission. These windows differ from insulated fire windows by not providing thermal barrier protection, making them suitable for areas where heat transfer is not a primary concern. They are commonly specified in commercial buildings, industrial facilities, and high-rise structures where fire compartmentation is required without complete isolation. Manufactured to meet international standards like EN 1364 or ASTM E119, these windows undergo rigorous testing to verify their fire resistance duration (typically 30-120 minutes). The design balances fire safety with architectural requirements, often serving as critical components in building facades while fulfilling fire code mandates for compartmentalization.

Structure and Working Principle

The standard Non-Insulated Fire Window consists of a steel frame and specially treated fire-resistant glass. The frame is constructed from cold-formed steel sections with intumescent seals that expand under heat to seal gaps. The glass is typically multi-layered tempered glass with fire-resistant interlayers that maintain integrity during fire exposure. During a fire, the window assembly works by maintaining its structural stability while preventing flame penetration. The glass layers char but don't shatter, and the frame resists warping. Unlike insulated models, these windows allow significant heat transfer through the glass while still blocking flames and smoke, making them unsuitable for areas requiring complete thermal protection.

Key Features

Fire resistance without complete thermal insulation is the defining characteristic of these windows. They typically achieve fire ratings from 30 minutes to 2 hours, certified through standardized furnace tests. The ventilation capability allows them to be used in smoke control systems, where they can remain open during normal operation but automatically close during fire events. Durability and low maintenance requirements make them practical for long-term installations. The steel frames are powder-coated for corrosion resistance, and the fire-resistant glass maintains clarity comparable to standard safety glass. These windows can be customized in various sizes and opening configurations (fixed, side-hung, or top-hung) to meet architectural specifications while maintaining fire performance.

Application Areas

Non-Insulated Fire Windows are predominantly used in commercial and industrial buildings where fire compartmentation is required without the need for thermal insulation. Common applications include corridor partitions, stairwell enclosures, and perimeter walls in office buildings, hospitals, and schools. They're particularly valuable in spaces requiring both fire separation and natural light, such as atriums or glass-fronted offices. In industrial settings, these windows are installed in factory partitions where visibility between work areas must be maintained. They're also specified in car parks and warehouses where fire separation is mandated but complete thermal insulation isn't necessary. Building codes often dictate their use in specific locations based on occupancy type and fire risk assessments.

Maintenance and Precautions

Regular inspection of Non-Insulated Fire Windows is crucial to maintain their fire rating. This includes checking frame integrity, verifying operable mechanisms function properly, and ensuring no damage to glass surfaces. Intumescent seals should be visually inspected annually and replaced if degraded. Cleaning should use non-abrasive methods to preserve fire-resistant coatings on glass. Installation must follow manufacturer specifications precisely, as improper framing can compromise fire resistance. These windows should never be modified after installation, including drilling additional holes or adding non-approved attachments. In retrofit projects, existing openings may require structural reinforcement to support the heavier fire-rated frames and glass.

B2B Procurement Guide

When procuring Non-Insulated Fire Windows, verify third-party certification for the specific fire rating required by your project. Request test reports showing compliance with relevant standards (EN, ASTM, or GB depending on region). Consider lead times, as customized sizes may require 4-8 weeks for manufacturing and certification documentation. Evaluate total cost of ownership, including installation requirements and long-term maintenance. For large projects, request samples for mock-up testing before full production. Ensure suppliers provide complete installation instructions and certified inspection checklists. Volume discounts typically apply for orders exceeding 50 units, with prices varying based on size, fire rating duration, and opening mechanism complexity.