Follow the air through the system
- Room air enters the cupboard through the working opening and other designed air paths.
- The enclosure’s shape and internal features guide air around the working area.
- The exhaust fan draws air through the duct system.
- The system discharges outside through its designed outlet.
- The laboratory needs an appropriate supply of replacement air.
The aim is to draw chemical fumes and vapours away from the operator during the assessed task. The system needs to suit the substances, apparatus and room conditions in which it is used.
The sash is part of the airflow arrangement
The movable front panel gives access to the work. Its operating position forms part of the cupboard’s assessed arrangement. Use the labelled working position and the model instructions.
Different Calibre designs manage changes in the opening differently. Smoothflow has a bypass grille above the sash. SashDrive uses sash position to regulate exhaust fan speed. The Calibre model comparison explains the starting points for choosing between the ranges.
The fan works with the route
A fan needs to deliver the required duty through the connected system. Duct length, fittings and other components affect that arrangement. Identify the cupboard and the existing fan before discussing a replacement.
We pair the TD250 with Student cupboards and the D250 with Smoothflow and SashDrive. Our fan-selection guide helps you collect the existing model, controls and route information for an enquiry.
The room affects the working opening
Air supplied to the room replaces air extracted by the cupboard. Doors, nearby movement and ventilation outlets can also disturb airflow around the opening. The room and cupboard should therefore be reviewed together.
Keep airflow paths clear and follow the approved operating procedure. If the cupboard alarms or its behaviour changes, use the laboratory’s response procedure and record what happened. We can discuss servicing or testing for the installed system.
Our replacement-air guide helps gather the building information. Use the positioning checklist when discussing doors, traffic and nearby air outlets.