Heat build-up in a large facility is not always simply a comfort issue. When internal temperatures rise around machinery, production areas or occupied work zones, the effects can extend into day-to-day operations and the conditions people work in.
Machinery, production processes, solar gain and external conditions can all contribute to internal heat loads. The impact can also vary significantly across the same building, particularly where high ceilings, equipment, racking and enclosed areas create different thermal conditions. Understanding where heat develops and what part of the operation it affects provides a better starting point than treating the entire facility as one temperature problem.
How heat can affect day-to-day operationsÂ
The significance of heat depends on what is exposed to it and for how long. Conditions around a production line, storage area or physically demanding workstation can differ considerably, even within the same facility.
Heat build-up can have implications across several areas of an operation:
Worker conditions
Higher temperatures can increase heat exposure, particularly where work is physically demanding or employees spend extended periods near heat-generating equipment.
Machinery and equipment
Ambient temperatures around machinery can be considerably higher than elsewhere in the building, particularly where equipment operates continuously or heat becomes concentrated within enclosed areas.
Production processes
Some processes can both generate heat and be affected by surrounding conditions, creating localised areas that may require closer attention.
Storage environments
Materials and products with specific temperature requirements may be affected where storage areas experience sustained or uneven heat.
Ventilation and cooling demand
As internal heat loads increase, existing ventilation or cooling systems may need to manage conditions beyond those originally considered.
Importantly, air temperature alone does not determine heat risk. Safe Work Australia identifies factors such as humidity, air movement, radiant heat, physical workload, clothing and duration of exposure as relevant when assessing work in heat.
Heat build-up should therefore be considered in the context of people, processes and operating conditions, rather than simply whether a facility feels warm.
Where heat develops and why it matters
Heat loads can develop differently across a facility depending on production activity, equipment, building design and external conditions. Identifying the source is important because a localised machinery heat load presents a different operational challenge from warm air accumulating across an entire building.
| Heat condition | Operational consideration | Potential response |
| Machinery and process heat | Can create concentrated hot zones around equipment and work areas | Source control, targeted air movement or extraction |
| Heat across large open areas | Can affect conditions over a broad production or warehouse floor | Wider air circulation |
| Warm air accumulating at roof level | Can create significant temperature differences vertically | High-level extraction or destratification |
| Steam or process-generated heat | Heat may be concentrated close to a specific process | Local extraction where appropriate |
| Solar and seasonal heat | Can add to existing internal heat loads during warmer conditions | Review ventilation requirements as conditions change |
| Increased production loads | More machinery or longer operating hours can increase heat generation | Reassess whether existing ventilation remains suitable |
Why large facilities present a greater challenge
Large buildings create a particular problem: conditions are rarely uniform from one end of the facility to the other.
A production line may generate significant heat while an adjacent storage area remains relatively unaffected. High-ceiling spaces can experience temperature stratification, while racking, mezzanines and enclosed areas can create distinct thermal zones within what appears to be one open building.
This means three questions become particularly useful:
Where is the heat concentrated?
Identify processes, machinery and building areas experiencing consistently higher conditions.
Who or what is exposed?
Separate occupied work areas from equipment, storage and process zones rather than treating them as having identical requirements.
Is the problem localised or building-wide?
A localised source may call for a different response from heat accumulating throughout a large open building.
Fanquip has previously explored the related issue of temperature stratification in its article on using wall fans to distribute heat in large facilities. That article focuses specifically on heat distribution, whereas the operational assessment here considers whether accumulated heat needs to be controlled at the source, redistributed or removed.Â
Where ventilation fits into heat management
Ventilation can form part of the response once the nature of the heat problem is understood. The important distinction is between moving air within the facility and removing heated air from it.
For work areas requiring more localised air movement, Fanquip Air Circulators are available in pedestal, utility and wall-mounted arrangements. These provide different ways of introducing air movement into specific work areas or larger spaces.
Where the requirement extends across a much larger open area, a high-volume solution can provide broader coverage. Fanquip’s cooling range includes large-format fan equipment alongside its more targeted circulation products.
Extraction serves a different purpose. Where accumulated heated air needs to leave the building, Roof Fans or other extraction solutions may form part of the system.
Safe Work Australia similarly identifies engineering controls such as ventilation, local exhaust ventilation, increasing air movement and isolating or insulating heat sources as potential measures for managing heat, depending on the circumstances.
The takeaway here is not that fans solve every heat problem. Ventilation is one control, and its role depends on the heat source and the operational conditions being managed.
Planning for changing heat loadsÂ
One of the easier heat-management issues to overlook is change.
A facility may have adequate ventilation when first commissioned, but the operating environment does not remain fixed. Additional machinery, longer production hours, new racking, extensions or increased throughput can change both the amount of heat being generated and where it occurs.
A useful review therefore looks beyond whether the existing fans are still operating:
- Has production increased? More equipment utilisation can increase the internal heat load. Â
- Has new machinery been installed? New equipment can create additional localised heat sources. Â
- Has the layout changed? Racking, partitions and production lines can create new thermal zones. Â
- Have operating hours increased? Longer equipment run times can change how heat accumulates during a shift. Â
- Are seasonal conditions exposing a previously minor issue? External heat can amplify an existing internal heat load. Â
This is where the operational perspective becomes particularly important. The ventilation equipment may still be functioning correctly while the conditions it was originally selected for have changed.
Fanquip has previously covered cooling strategies specifically for manufacturing facilities and food processing plants. Those resources can provide application-specific guidance, while this article remains focused on recognising heat as an evolving operational issue.
Ultimately, the starting point should be to establish what is generating the heat, what part of the operation is being affected and whether the conditions have changed. From there, circulation, extraction, source control or another engineering measure can be considered based on the actual problem.
FAQs
Heat becomes more significant when it begins affecting occupied work areas, equipment environments, production processes or other temperature-sensitive activities. Temperature alone does not determine workplace heat risk; factors such as humidity, radiant heat, air movement and physical workload also need consideration.Â
They can support heat management where increased air movement is appropriate. Air Circulators redistribute air within a space, while extraction equipment removes air from the building. The appropriate approach depends on the source and location of the heat. Â
No. Heat may originate from a specific process, accumulate at high level or be affected by external conditions. In some cases, source control, insulation, extraction or other engineering measures may be more appropriate than simply increasing general air movement.
Significant changes to machinery, production levels, operating hours, building layout or facility use can justify reviewing whether the original ventilation arrangement still reflects current conditions.