What Does a Vertical Fire Resistance Furnace Do?

The vertical fire resistance furnace simulates standard fire exposure temperature conditions on vertical building elements, evaluating three core performance dimensions:

• Integrity — whether the element develops cracks, openings or penetrations that let flames or hot gases through
• Insulation — whether the unexposed face stays below the allowable temperature rise
• Stability — whether the element maintains its load-bearing or separating function under fire exposure

The result is a fire rating evaluation that determines how long a construction component can perform its function in a fire — measured in minutes, and backed by controlled, repeatable testing conditions.

Where Vertical Fire Resistance Testing Is Used

• Fire-resistant walls and partitions — separating fire compartments in buildings
• Building doors and panels — fire doors, fire windows and cladding panels
• Curtain wall and structural components — facade systems and load-bearing elements
• Construction material research — fire dynamics and material performance studies
• Fire testing laboratories and certification institutions — accredited fire rating certification

The International Standards Framework

A vertical fire resistance testing system of this type is commonly referenced against the international framework of fire resistance test standards:

• ISO 834-1 — Fire-resistance tests — Elements of building construction — General requirements
• EN 1363-1 — Fire resistance tests — General requirements
• EN 1364 series — Fire resistance tests for non-loadbearing elements
• EN 1365 series — Fire resistance tests for loadbearing elements
• ASTM E119 — Fire tests of building construction and materials
• GB/T 9978 series — Fire-resistance tests for building elements

For manufacturers selling into international markets, a furnace that supports this standards framework means one investment can serve multiple certification requirements.

BRT’s Solution: NH-XL Vertical Fire Resistance Test Furnace

The BRT NH-XL is a vertical comprehensive fire-resistance test furnace designed from the ground up to meet these demanding standards.

High-temperature furnace construction

• Metal frame with a baked-enamel steel-plate outer shell; furnace body and roof built on a lightweight high-alumina fiber suspended structure lined with zirconium-fiber wool block modules, with the same module construction on the floor
• Maximum operating temperature of 1300 °C, reproducing the standard fire temperature curve with tight control

Precise, automated combustion control

• Runs on natural gas or LPG with 8 burners operating on proportional combustion
• Automatic furnace-pressure control and automatic temperature regulation
• The entire temperature curve is managed through a programmed sequence with computer-aided operation — barely requiring manual parameter adjustment
• Effective internal test space of 3.0 m × 3.0 m × 1.2 m, large enough for standard-sized fire partitions, doors, windows and valves; specimens mount externally for straightforward loading and unloading

Complete failure-mode judgment

• Covers both core failure modes: insulation failure (mean temperature rise on the unexposed face exceeding 140 °C, or any single point exceeding 180 °C) and integrity failure (cracking or penetration)
• Broad test coverage across fire partition walls, doors, windows, roller shutters, check valves and oil-fume exhaust dampers

Who Needs the NH-XL?

• Manufacturers of fire-protection building components — factory-gate quality control and certification preparation
• Third-party fire testing laboratories — where the precision of the furnace’s temperature curve and pressure control determines whether a test report can withstand review and regulatory audit
• Construction material research institutes and certification bodies — fire rating evaluation of walls, doors, panels, curtain walls and structural components

FAQ

What is a vertical fire resistance furnace? A vertical fire resistance furnace is a fire testing instrument that exposes vertical building elements — walls, partitions, doors, panels and curtain walls — to a controlled standard fire, evaluating their integrity, insulation and stability to determine a fire resistance rating.

Which standards apply to vertical building element fire testing? The international framework includes ISO 834-1 and EN 1363-1 (general requirements), EN 1364 series (non-loadbearing elements), EN 1365 series (loadbearing elements), ASTM E119 and the GB/T 9978 series.

What does “integrity and insulation” mean in fire resistance testing? Integrity refers to whether the element develops cracks or openings that let flames through; insulation refers to whether the unexposed face exceeds the allowable temperature rise (mean >140 °C or single point >180 °C in the NH-XL test criteria). Both are judged during the fire test.

How hot does the furnace get? The NH-XL reaches a maximum operating temperature of 1300 °C, reproducing the standard fire temperature curve with automatic temperature and furnace-pressure control.

Which elements can the NH-XL test? Fire partition walls, fire doors, fire windows, roller shutters, check valves and oil-fume exhaust dampers — with a test space of 3.0 m × 3.0 m × 1.2 m and external specimen mounting.

Get a Quote

Need a reliable vertical fire resistance furnace for building element fire rating testing? Contact Baoruitong Automation Equipment Co., Ltd. today for the NH-XL datasheet, test procedure guidance and a customized quotation. Every BRT instrument is backed by a 1-year warranty, installation guidance, operation training and long-term after-sales support.

Email: info@brt-test.com | WhatsApp: +86 15604057553 | Web: www.brt-test.com