KNOKOO-Fume Hood

I. Product Overview

The Fume Hood is a critical front-end component responsible for source-level pollutant capture in air filtration systems. Its structural design directly determines contaminant collection efficiency and overall system energy consumption.
This product is primarily categorized by material and shape, enabling precise adaptation to different operating conditions. Detailed specifications are outlined below.

II. Core Material Performance Comparison

1. Silicone Material

• Temperature Resistance
  Stable operating range from –60°C to 300°C, with short-term tolerance up to 350°C.

• Chemical Resistance
  Capable of withstanding highly corrosive media, including 98% concentrated sulfuric acid, 40% hydrofluoric acid, and strong alkaline environments up to pH 14, making it suitable for harsh industrial conditions.

• Flexibility & Mechanical Strength
  Shore hardness 50A–80A, allowing up to 30% bending deformation, enabling seamless integration with irregular equipment such as robotic welding torches.

• Transparency
  Semi-transparent appearance with 40%–60% light transmittance, suitable for airflow observation in non-high-definition monitoring scenarios.

• Service Life
  Anti-aging formulation ensures a lifespan of 3–5 years. Resistant to high-pressure water jet cleaning, minimizing replacement frequency.

• Maintenance Cost
  Localized damage can be repaired using a 250°C hot air gun, allowing thermal patch repair with low maintenance cost and improved operational economy.

2. PC (Polycarbonate) Material

• Temperature Resistance
  Stable operation from –40°C to 135°C, with short-term resistance up to 150°C.

• Chemical Resistance
  Excellent compatibility with water-based cutting fluids and food-grade oil mist. Susceptible to corrosion from organic solvents such as acetone and chloroform.

• Rigidity & Impact Strength
  Rockwell hardness R118, impact strength >80 kJ/m², offering outstanding rigidity and collision resistance.

• Transparency
  High transparency with >88% light transmittance, providing near-glass clarity—ideal for precision operation monitoring.

• Service Life
  Typical lifespan of 2–3 years, extendable up to 5 years with UV-resistant coating. Requires dedicated cleaning agents to prevent surface scratching.

• Maintenance Cost
  Once cracked or broken, the hood must be replaced entirely, resulting in relatively higher maintenance costs.

III. Material Selection Recommendations

• High-Temperature / Corrosive Environments
  Silicone fume hoods are strongly recommended. Their 300°C heat resistance and exceptional chemical tolerance make them the optimal choice for welding, chemical processing, and other demanding applications.

• Moderate-Temperature / Clean Environments
  PC fume hoods offer superior cost-effectiveness. Their ultra-high transparency makes them ideal for food processing, laboratories, and cleanroom applications requiring clear visual monitoring.

• Flexibility vs. Rigidity Requirements
  Silicone hoods excel in flexible deformation and adaptability to irregular equipment, while PC hoods provide superior rigidity and are better suited for impact-resistant applications.

• Economic Considerations
  Silicone hoods have a higher initial cost but offer longer service life and lower maintenance expenses, making them more economical over long-term use.
  PC hoods have lower upfront cost but shorter lifespan and higher replacement costs, suitable for short-term or low-frequency usage scenarios.

IV. Core Shape Performance Comparison

1. Rectangular Fume Hood

• Design Features
  Rectangular or square structure with right-angle edges, delivering robust and stable structural integrity.

• Coverage Area
  Standard coverage area of ≥1 m², suitable for capturing pollutants over large emission zones.

• Airflow Distribution
  Forms a uniform negative pressure field, ensuring efficient and consistent capture of widely dispersed fumes and particulates.

2. Round Fume Hood

• Design Features
  Cylindrical or hemispherical structure with streamlined curved surfaces to reduce airflow resistance.

• Coverage Area
  Typical diameters range from 0.3 m to 0.8 m, ideal for targeted capture of point-source emissions.

• Airflow Distribution
  Concentrated central suction provides strong localized capture, enabling precise extraction of pollutants at the source.

V. Shape Selection Recommendations

1. Applications for Rectangular Fume Hoods

• Industrial Welding
  Robotic welding stations and large-scale welding production lines requiring efficient coverage of extensive fume generation areas.

• Commercial Kitchens
  Large cooking ranges and frying equipment, ensuring effective capture of dispersed cooking oil fumes.

2. Applications for Round Fume Hoods

• Laboratory Environments
  Fume cupboards and laboratory workbenches for precise capture of hazardous gases generated during chemical experiments.

• Precision Processing
  Laser engraving machines and small welding equipment, enabling focused extraction of locally generated fumes.