Look beyond the roof penetration
Mark nearby air intakes, opening windows, occupied areas and neighbouring buildings on the site information. Include roof shapes and access routes that affect the proposed location.
The designer needs to assess how the exhaust disperses under the relevant conditions. A convenient penetration point alone does not resolve that assessment.
Prepare the site information
| Information | Include |
|---|---|
| Process | Exhaust composition and operating pattern. |
| Duty | Airflow under the proposed operating states. |
| Building | Plans, elevations, roof arrangement and air intakes. |
| Surroundings | Nearby buildings and occupied or public areas. |
| Access | Inspection, support and maintenance arrangements. |
Coordinate the fan and outlet
The discharge arrangement contributes to the complete extraction design. Review it with the duct route, fan selection and controls, including any variable-volume operating conditions.
Our pressure-drop guide helps define the system boundary. The fan guide and fitting schedule help prepare the corresponding equipment information.
Keep the final arrangement documented
- Retain the assessed discharge location and design basis.
- Show the final outlet and support details on the drawings.
- Identify access and inspection responsibilities.
- Record relevant operating conditions at handover.
- Review later building or ventilation changes that affect the discharge.
Nearby construction, new air intakes or an altered process can change the original assumptions. Include those changes in the review before modifying the installation.