Usable work surface is more than the outside width
The cupboard’s overall dimensions do not describe all the space available for apparatus. Internal walls, baffles, service fittings and the sash arrangement affect the working area. Use the model drawing and the actual apparatus dimensions.
Show where the operator stands, how vessels are moved and which controls need access. Avoid crowding the opening or obstructing internal airflow paths. Leave the clearances required by the cupboard and apparatus instructions.
Our fume cupboard dimensions guide helps organise the room and equipment measurements. The worktop drawing then turns those dimensions into a usable layout.
Loads and support beneath the surface
List the weight and footprint of each item, including its contents during use. A heavy item on small feet creates a concentrated load. A broad vessel or several items can load a different part of the top and support structure.
Ask for the permitted loading and support requirements of the complete assembly. Confirm the load capacity of the complete top and cabinet, including cut-outs, unsupported edges and supports.
| Item | Record |
|---|---|
| Apparatus | Footprint, weight when loaded and normal position. |
| Access | Operating, cleaning and removal space. |
| Services | Sink, tap, electrical and other required points. |
| Support | Cabinet or frame arrangement and any concentrated loads. |
Material choice for the actual contact conditions
Describe chemicals, concentrations, cleaning products and the possibility of spills. Add hot apparatus and any direct contact with heated vessels. Select the exact surface product using its own material and care information.
Our phenolic vs epoxy resin countertop comparison explains how to compare those material families. The choice should also suit the edge and joint details needed by the cupboard.
Keep the worktop separate from the liner material specification. The surfaces can experience different kinds of contact even within the same enclosure.
Edges, sinks and spill handling
Agree the edge profile and how a spill is intended to be managed. The finished geometry, joints and penetrations determine where liquid can travel. Do not infer a spill capacity without the model’s documented arrangement.
A sink or drip cup changes the usable area and introduces a wetted path through the top. The cut-out, mounting and sealing need to be coordinated before fabrication. See the sink planning guide for material and waste-route questions.
Identify all service penetrations and their location relative to apparatus and the sash. Later drilling or an improvised opening can affect the surface and cupboard construction.
Approve the drawing and keep it current
Review a dimensioned drawing with the apparatus and services in place. Check handedness, access, support and the connection route beneath the top. Confirm that the proposed arrangement matches the equipment and process the laboratory intends to use.
Retain the material details, load information, care instructions and final drawing. After installation, check the finished layout and the appropriate cupboard operating performance before the process starts.
When apparatus or chemicals change, review the layout again. A new instrument can fit on the surface yet create a load, heat or airflow issue that the original arrangement did not have.
Questions about fume hood worktop
Can the top be selected from width and depth alone?
You also need material suitability, loads, support, edge details, cut-outs and operating clearances. The complete layout determines whether the surface serves the task.
Can we add a service hole after installation?
Agree any alteration with the cupboard supplier and responsible project team. It needs to preserve the surface, support, sealing and enclosure requirements.