GB/T 9978 NH-XL Vertical Integrated Fire Resistance Test Furnace | Vertical Partition Fire Door Window Roller Shutter Fire Limit Tester

3. Core Technical Specifications

3.1 Furnace Structure & Lining

1. Internal test cavity size: 3.0 m × 3.0 m × 1.2 m
2. Overall equipment dimension: 8000 × 6000 × 7000 mm (net height 5500 mm)
3. Outer shell: Painted steel plate + heavy-duty metal frame
4. Lining structure: Suspended lightweight high-alumina zirconia fiber blocks for furnace wall & roof; zirconia fiber block furnace bottom
5. Max sustainable operating temperature: 1300℃
6. Specimen installation: External wall-mounted structure for vertical samples

3.2 Standard Fire Temperature Rule

• t = test time (min), T = furnace temperature (℃), T₀ = initial furnace temp (5℃~40℃)

3.3 Standard Furnace Pressure Requirements

1. 5 minutes after ignition: 15 Pa ± 5 Pa
2. 10 minutes after ignition: 17 Pa ± 3 Pa

3.4 Fire Resistance Judgment Criteria

1. Loss of integrity: Flame penetration, sustained glowing combustion or cotton ignition through cracks/gaps
2. Loss of thermal insulation:
   • Average temperature rise on unexposed surface exceeds 140℃ above initial temp
   • Single-point temperature rise on unexposed surface exceeds 180℃ above initial temp

3.5 Combustion & Control System

1. Burner quantity: 8 sets proportional combustion burners
2. Available fuel: Natural gas or liquefied petroleum gas (LPG)
3. Core control functions: Proportional combustion regulation, automatic furnace pressure adjustment, programmed standard temperature curve operation, full computer data management
4. Exhaust design: Rear mechanical exhaust system, connectable to workshop dust removal treatment system

4. Main Product Features

1. Full set compliance with vertical fire protection product national standards

    

   Covers all test specifications for fire doors, fire windows, roller shutters and partition walls; test data valid for official fire resistance rating certification of fire protection products.
2. Lightweight zirconia fiber suspended lining structure

    

   Low thermal mass fiber hanging design achieves fast temperature rise and rapid cooling after testing, greatly improving daily test efficiency; excellent high-temperature stability with no cracking or shedding under long-term 1300℃ heating.
3. 8 proportional burners for uniform vertical heating

    

   Distributed burner layout ensures consistent temperature distribution over the full 3m vertical specimen mounting area, eliminating local overheating and guarantee repeatable test results for large-size fire doors and partition panels.
4. Closed-loop auto temperature & pressure dual control

    

   Automatically tracks the standard ISO-style time-temperature curve; real-time exhaust linkage adjusts furnace pressure to strictly meet 5min/10min pressure thresholds, with automatic overpressure protection.
5. Integrated computer automatic data acquisition

    

   Real-time recording of furnace temperature, furnace pressure and multi-point specimen backside temperature; auto curve generation, data storage and export, one-click complete test without constant manual supervision.
6. Universal external vertical specimen mounting wall

    

   One-piece external installation frame fits all standard vertical test samples including fire doors, fire windows, glass partition and full-size roller shutter panels, convenient specimen disassembly and replacement.
7. Compatible dual fuel supply (Natural Gas / LPG)

    

   Flexible fuel selection adapts to different factory gas supply conditions; proportional gas mixing ensures stable, uniform flame output without fluctuation.
8. Connected industrial flue gas dust removal system

    

   Rear mechanical exhaust pipeline can be directly linked to existing workshop waste gas treatment equipment, complying with environmental protection emission standards during long-term batch testing.