The Series-GS filtered fume hoods can be manufactured in a special DF (DOWN-FLOW) configuration specifically designed to protect personnel from airborne particulate matter, including highly hazardous substances. Typical applications include soil/ground and waste sample preparation activities, handling of pharmaceutical compounds, or any preparatory process in which significant dust release may occur.

This special configuration features a working chamber entirely made of AISI 304 stainless steel with SB finish (optional versions are available in AISI 316, including BA super mirror finish). Thanks to its electrical conductivity, the stainless steel structure eliminates electrostatic adhesion of particles to the internal surfaces of the chamber, thereby facilitating decontamination at the end of each work cycle.

The work surface is equipped with a double-bottom structure with removable gridded panels directly connected to the internal plenum. This design generates an airflow pattern directed toward the work surface while maintaining the horizontal airflow typical of traditional chemical fume hoods toward the rear of the chamber.

The presence of the gridded surface creates a negative-pressure interspace where heavier particulate matter is confined, keeping the work surface cleaner and easier to decontaminate.

The system can also be equipped with an extractable spray nozzle for washing all internal vertical surfaces. Water is conveyed into the double-bottom chamber, where a drain outlet allows safe collection.

Equipped with an onboard filtration system, when operating in recirculation mode the unit provides personnel protection without the construction and energy costs associated with complex ducted ventilation systems for exhausting air outside the building. However, if safety requirements demand external exhaust, the same unit can also be configured for ducted operation with filtered air discharge.

Dust filters, vapor filters, or combinations of both can be installed, allowing the hood to be adapted for virtually any application. The system can also be structurally integrated with BIBO (Bag-In/Bag-Out) systems for safe filter replacement in controlled contamination environments.

Functional flexibility

The whole GS-Series fume cupboard range can work within three different modes:

  • R-MODE: 100% recycle mode. The fume cupboard is equipped with filtration system and fan and recycle lab-air without affectin the ventilation system of the lab
  • FE S/M-MODE: filtration+exhaust mode with embedded fan. The fume cupboard is equipped with filtration system and fan and works exhausting the air thorugh a duct collard in a exhausting-pipe using on-board fan but keeping at the same time the filtration system on board. This solution simplifies the installazion of the unit as no remote-fan is required.
  • FE-C/M-TH-MODE: filtration+exhaust mode with embedded fan and THIMBLE connection to the ventilation system. The fume cupboard is equipped with embedded filters and fan; the filtered air is conveyed outside through a thimble connection linked to an existing ventilation duct equipped with an auxiliary remote blower as well. This solution allow to decouple the containment of the hood from the design point of the ventilation system.
  • FE C/M-MODE: filtration+exhaust mode with remote fan. The fume cupboard is equipped with filtration system and works exhausting the air thorugh a duct collard in a exhausting-pipe using a frequency-conveter-controlled fan but keeping at the same time the filtration system on board. This solution allow to fit installation-sites where long-exhausting pipes are present and where total negative pressure is strictly required from the working area within the unit up to the external. According to exhaust-system layout the fume cupboard can even be equipepd with a parzialization valve.

CE marking

  • 2006/42/UE Machinery Directive
  • 2014/35/UE Low Voltage Directive (50-1000 V)
  • 2014/30/UE Electromagnetic Compatibility Directive
  • 2011/65/UE ROHS Directive

The control panel of the fume cupboard (TIMELOG) allow a real-time showing of  main functional parameters such as:

  • air face velocity and exhausting flow rate
  • residual time to next filter or prefilter replacement/control (two different timers)
  • working opening height
  • air temperature
  • warming-up cycle with self-testing routint of the prefilter saturation level

The TIMELOG allow the showing of the following alarms:

  • air face velocity below the safety-threshold
  • working opening height above maximum
  • air-temperature beyond maximum level for a good absorption capacity
  • expired filter/prefilter estimated lifetime
STANDARDS

The entire range of hoods in DF configuration features the same functional characteristics as the GS-Series filtration fume hoods:

    • BS7258:1994 – Laboratory fume cupboards: specification for safety and performance
      Containment and face air-velocity test
    • BS7989:2001 – Specification for recirculatory filtration fume cupboards
      Retention capacity and efficiency test of the activated carbon filtration system installed on a recirculating fume cupboard. The reference chemicals used within this standard are: isopropyl alcohol, ammonia, formaldehyde and sulfur dioxide
    • ANSI/ASHRAE110:1995 – Method of Testing Performance of Laboratory Fume Hoods
      Containment and face air-velocity test
    • DIN 12924

Furthermore, the whole range of GS-Series is manufactured according to EN14175-2 requirement, and it is provided with conformity declaration certificate.

All models have been tested and certified to EN14175-3 and EN14175-6 both at 0.3 and 0.5m/s face velocity.

CONSTRUCTION
  • RAL7015 coloured epoxy-powder MICROFREE® antimicrobial coated aluminium aerodynamic shaped uprights
  • INOX AISI304 stainless steel frame
  • Frontal counterweighted sliding sash with double-rope suspension made with 3+3 PVB safety glass
  • Worktop and grids made in INOX AISI304
  • Electrical system IP44 with magneto-thermic switch protection
  • Embedded fan electronically controlled with full VAV sytem
  • Exhausting system connection through 250mm diameter manifold

DIMENSION

Three different width and two different depth are available:

  • 1200/1500/1800mm external width
  • 750/900mm external depth
  • 2406mm external height