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Fume Extraction System

PRIMARY HOOD (SIDE SUCTION HOOD)

A side suction hood is a vital element of the primary fume extraction system in an induction furnace, specifically engineered to effectively capture hazardous smoke, metallic fumes, and fine dust generated during critical operations such as charging and poking. Positioned strategically at the side of the furnace opening, it targets emissions at their point of origin, where turbulent release of pollutants is most intense due to material impact and manual intervention. Unlike overhead systems alone, the side suction hood is designed to handle lateral dispersion of fumes, creating a localized negative pressure zone that prevents contaminants from escaping into the shop floor environment. It is typically integrated with a high-capacity ducting network, induced draft fans, and dust collection units such as bag filters or scrubbers, ensuring efficient transport and filtration of pollutants. Engineered with optimized hood geometry, adequate face velocity, and heat-resistant materials, the system ensures maximum capture efficiency even under fluctuating operating conditions. This not only enhances worker safety and visibility but also minimizes environmental impact, supports compliance with stringent emission norms, and contributes to overall operational reliability and cleanliness within the plant.

ADVANTAGES

Efficient fume capture at source
Enhanced worker safety
Regulatory compliance
Improved visibility and access
Optimized airflow
Integration with filtration systems
Reduced equipment contamination
Operational efficiency
Cost-effective solution

SECONDARY HOOD (SHED HOOD)

The Secondary Shed Hood is an essential component of an induction furnace’s fume management system, specifically engineered to capture fugitive emissions generated during critical processes such as slagging and tapping. Installed at the shed or roof level, the hood is strategically positioned to cover the entire furnace operating area, creating an effective containment zone for rising smoke, dust, and metallic fumes that naturally escape upwards due to thermal buoyancy. By intercepting these emissions before they disperse into the shop floor or adjacent work zones, the shed hood significantly reduces occupational exposure, improves visibility, and minimizes contamination of the plant environment. Designed with optimized hood geometry and sufficient capture velocity, it works in tandem with the primary side suction and top hoods to provide a comprehensive fume extraction solution. The system typically integrates with high-capacity ducting, induced draft fans, and filtration units such as bag filters or electrostatic precipitators, ensuring that captured pollutants are efficiently conveyed and treated. Beyond protecting workers and maintaining regulatory compliance, the Secondary Shed Hood enhances overall plant hygiene, reduces maintenance of surrounding equipment, and contributes to safer and more efficient furnace operations.

ADVANTAGES

Captures fugitive emissions effectively
Covers entire furnace operating area
Reduces spread of fumes to shop floor
Enhances worker safety
Improves air quality in surrounding zones
Works in conjunction with primary hood
Minimizes equipment contamination
Supports regulatory compliance
Maintains cleaner and safer plant environment

DOGHOUSE HOOD (ENCLOSURE HOOD)

The Dog House Hood is a specialized fume extraction solution designed to provide comprehensive containment and removal of hazardous emissions during critical induction furnace operations such as melting, superheating, charging, and slag removal. Unlike side or top hoods, the Dog House Hood fully encloses the furnace area on all sides, forming a controlled environment that maximizes the capture of smoke, dust, and metallic fumes generated throughout the furnace cycle. Its robust structural design ensures minimal leakage, maintaining a consistent negative pressure within the enclosure to effectively draw fumes toward the connected ducting system. The hood is typically constructed from heat-resistant materials and engineered with optimized geometries to handle turbulent and high-temperature emissions, while integrated with high-capacity fans and dust collection systems like bag filters for safe disposal or filtration. By fully encapsulating the furnace, the Dog House Hood not only significantly improves worker safety and shop-floor air quality but also enhances operational efficiency by preventing emission spread to surrounding equipment and work zones. This makes it an indispensable component in plants aiming for maximum fume control, regulatory compliance, and improved furnace performance.

ADVANTAGES

Full enclosure of furnace area
Maximum fume capture during all operations
Effective for melting, superheating, charging, and slag removal
Prevents emission spread to shop floor
Enhances worker safety
Improves air quality around furnace
Reduces contamination of nearby equipment
Supports regulatory compliance
Maintains consistent negative pressure for efficient extraction

PRIMARY + SECONDARY HOOD (HYBRID HOOD)

Centralized Welding Fume Extraction System

The Primary Hood is installed directly above the furnace area and serves as the first line of defense in capturing high-temperature fumes, smoke, and metallic vapors generated during intensive operations such as melting and superheating. Designed to withstand extreme temperatures, the primary hood efficiently collects emissions at the point of generation, preventing their immediate escape into the surrounding shop floor. Complementing this, the Secondary Hybrid Hood is installed above the primary hood and is engineered to capture fugitive emissions that are released during intermittent furnace operations like tapping, slagging, and material charging. The hybrid design combines elements of a top hood and a shed-type enclosure, ensuring both vertical and lateral containment of rising fumes. Together, the primary and secondary hoods form an integrated fume extraction system: the primary hood handles continuous, high-temperature emissions, while the secondary hybrid hood addresses sporadic and escaping pollutants, providing comprehensive coverage of the furnace area. This dual-hood arrangement not only enhances worker safety and indoor air quality but also improves plant hygiene, regulatory compliance, and operational efficiency, minimizing exposure risks and protecting both personnel and equipment from harmful particulate deposition.

ADVANTAGES

Combines continuous and fugitive fume capture
Provides comprehensive coverage of furnace area
Maximizes worker safety
Reduces emissions on shop floor and surrounding zones
Enhances operational efficiency
Minimizes equipment contamination
Supports regulatory compliance
Maintains cleaner and safer plant environment
Optimized airflow for consistent fume extraction

PRIMARY + DOGHOUSE HOOD (HYBRID HOOD)

The Primary + Doghouse Hood (Hybrid Hood) is an advanced fume extraction solution that combines the strengths of both the Primary Hood and the Doghouse Hood to provide maximum containment and removal of hazardous emissions from an induction furnace. The primary hood, installed directly above the furnace, captures the high-temperature fumes and smoke generated continuously during melting, superheating, and charging, ensuring immediate containment at the source. Enclosing the furnace area on all sides, the Doghouse Hood adds an additional layer of protection by intercepting fugitive emissions produced during operations such as slag removal, tapping, and intermittent charging, which may escape conventional hoods. This hybrid configuration creates a fully controlled environment, maintaining consistent negative pressure to draw fumes efficiently into the connected ducting system, while preventing dispersion into the shop floor or surrounding work zones. Constructed with heat-resistant materials and optimized geometry, the hood can handle turbulent and high-velocity fumes, and is typically integrated with induced draft fans, ducting, and high-efficiency filtration units such as bag filters or electrostatic precipitators. By combining the continuous capture efficiency of the primary hood with the full-enclosure containment of the Doghouse Hood, the hybrid system ensures enhanced worker safety, regulatory compliance, and operational hygiene, while minimizing equipment contamination and maintaining a cleaner, safer working environment.