Ductless Fume Hoods

Features

The Esco Ascent Ductless Fume Hoods provide protection to both
laboratory personnel and the environment from toxic fumes and
are quickly becoming a viable alternative to conventional fume
hoods.
Unlike conventional fume hoods, these hoods filter out chemical
fumes and recycle air directly back to the laboratory, providing
energy savings, personnel and environmental protection,
convenience as you do not have to deal with complicated ducting
systems, and mobility, as ductless hoods are independent systems
which do not require connection to extraction systems.
Esco ductless fume hoods are independently tested by INVENT-UK
for the ability to filter contaminated air with efficiency and retention
capacity as required by the British Standard BS 7989 and French
Standard AFNOR NF X 15-211. Fume containment and airflow
uniformity meet the requirements of ASHRAE 110-1995, BS 7258,
EN 14175-3 and AFNOR NF X 15-203. The Esco combination of
effective containment and safe carbon filtration opens new, cost
effective applications for fume hood technology in laboratories
of the 21st century. 

• The "GREEN" solution
  - Environmentally friendly
  - Does not discharge toxic gases to the environment
  - Saves energy, and reduces total carbon footprint
  
• Safe carbon filtration
  - Compliance to international standards
  - Proprietary NanocarbTM activated carbon technology
  - Industry-unique dual diffuser system on our
  
• Ascent Max fume hoods optimizes carbon filter life
  - Optional VOC sensor system on our Ascent Max
  hoods detects filter saturation
  - FiltraCheckTM service to qualify your application's
  suitability for a ductless solution
  - Chemical Guide provides list of chemicals with
  specific suitability and safety data
  
• Low cost
  - No ductwork required
  - No exhaust system required
  - Saves the need for elaborate make-up air systems,
  in turn saving running costs required to condition
  make-up air
  
• Convenience
  - No installation hassle
  - Mobile, flexible and easily relocatable

 Airflow

• Ductless fume cabinets provide operator and environment protection from toxic vapors, gases and fumes.
• The inflow moves from the ambient environment into the work zone through the cabinet front opening, with an average velocity of 0.5 m/s or 100 fpm. Additional inflow air taken through the AutoPurge perforations at the back of the work zone prevents fume accumulation for better operator protection.
• Negative pressure is created in the cabinet's work zone, with no outflow created to compromise operator safety.
• The inflow flushes the entire work zone of the cabinet; within the main chamber of the cabinet, negative pressure (relative to the ambient environment) is maintained so that no chemical fumes or vapors escape the work zone.
• Air is taken through a pre-filter and an activated carbon filter mounted in the interior. The pre-filter is built-in with the activated carbon filter, prolonging carbon filter life by removing large particulates before the they enter the carbon filter. The carbon filter removes all fumes from the exhaust air stream; filtered clean air is exhausted directly back to the room from the top of the cabinet.
• The ductless fume cabinet can be remotely exhausted to the external atmosphere via a non-airtight thimble ducting system (optional), providing additional protection for the operator from volatile toxic chemicals used in high amounts, which normally would not be completely removed by the exhaust filter.