What is a duty point?
The airflow and pressure at which a fan operates in the real system, where the fan curve crosses the system curve. Fans are selected for that point, not for nominal catalogue size.
HVAC
HVAC Systems & Industrial Ventilation
Industrial fans, ventilation and smoke-control systems, selected from the duty point, engineered, automated and installed.
01Overview
Supply and engineering from one team
The HVAC department combines fans and control equipment with the engineering that sizes them: heat load, airflow, smoke control and CFD verification, followed by control programming and measured commissioning.
Request a quote →02We supply and engineer
Fans, ventilation and smoke control
Equipment and engineering are delivered together, so the fan that is installed is the fan that was calculated.
Industrial Fans & Ventilation Systems
Axial, radial, jet and smoke-extraction fans selected from the duty point, with Ex-proof and acoustic options.
View details →
HVAC & Smoke-Control Engineering
Heat-load, airflow and smoke-control calculations, CFD simulation, ventilation control and commissioning, with fans and control panels supplied by Powersense.
View details →03Delivery process
From requirements to handover
- 01
Heat load and ventilation rates
Indoor conditions and outdoor-air rates are set under EN 16798-1 or ASHRAE 62.1, and loads are calculated for each zone.
DeliverableDesign criteria, heat-load summary - 02
Duty point and fan selection
Airflow and system pressure loss define the duty point, and the fan is selected where its curve meets the system curve.
DeliverableFan selection sheet - 03
Smoke-control concept
Extraction rates, make-up air and temperature class are defined under the EN 12101 series and the fire-safety concept.
DeliverableSmoke-control concept, scenario matrix - 04
CFD verification
Airflow and smoke movement are simulated in the real geometry to confirm fan positions and escape-route conditions.
DeliverableCFD report - 05
Control and automation
Fan starters, dampers and detector signals are integrated in a control panel that runs each ventilation scenario.
DeliverableControl narrative, I/O list - 06
Commissioning and balancing
Airflow is measured against the design, each scenario is tested with the fire alarm and the results are recorded.
DeliverableCommissioning report
04Standards
International standards applied
These standards form the technical basis for design and equipment selection. The exact set is confirmed for each project against the national regulations in force.
- EN 16798-1Energy performance of buildings: indoor environmental input parameters for ventilation design.
- ASHRAE 62.1Ventilation and acceptable indoor air quality: minimum outdoor-air rates.
- EN 12101-3Smoke and heat control systems: specification for powered smoke and heat exhaust ventilators.
- ISO 5801Fans: performance testing using standardised airways.
- ISO 13350Fans: performance testing of jet fans.
- EN 14986Fans designed for use in potentially explosive atmospheres: design requirements.
05Project types
Typical project types
- Car parks and underground garages
- Industrial facilities
- Commercial kitchens and malls
- Hotels and hospitals
- Hazardous (Ex) areas
- Plant and technical rooms
06Technical notes
Technical notes and FAQ
When are Ex-proof fans required?
In areas classified as hazardous under IEC 60079-10-1. The fan and motor category must suit the zone, as set out in EN 14986 and the ATEX Directive.
