Spray painting is one of the fastest and most effective ways to achieve a professional finish. Whether you're refinishing a vehicle, repainting cabinetry, applying industrial coatings or completing a restoration project, the quality of the result depends on more than just the paint and spray gun.
Fumes, overspray and poor airflow can all impact the finish, create unnecessary waste and make the work environment less safe and less productive.
Understanding how to manage these challenges will help you achieve better results while creating a cleaner, more efficient workspace.
Why Spray Painting Creates Fumes
Most paints, primers and coatings contain solvents that release Volatile Organic Compounds, commonly known as VOCs, during application and curing.
These VOCs are what create the familiar paint smell. They can also accumulate quickly when spray painting takes place in enclosed spaces with inadequate airflow.
The stronger the concentration of fumes, the more difficult and unpleasant the working environment becomes. This is especially common in garages, workshops, temporary spray areas and confined spaces where fresh air is limited.
The solution is not simply opening a door and hoping for the best. Effective ventilation and extraction systems are designed to remove contaminated air and replace it with clean air, helping to maintain a safer and more comfortable workspace.
Ventilation Versus Extraction
The terms ventilation and extraction are often used interchangeably, but they perform different functions.
Ventilation focuses on moving air through a space. Fresh air is introduced while stale air is removed.
Extraction targets contaminants at their source, removing fumes, vapours or overspray before they can spread throughout the work area.
In many spray painting applications, the most effective setup combines both.
Ventilation helps maintain overall air quality while extraction systems capture airborne contaminants before they become a problem.
Choosing the Right Ventilation Fan
Not every spray painting environment requires a permanent spray booth. Portable ventilation systems offer a practical solution for workshops, garages and onsite work where flexibility is important.
General purpose ventilation fans are ideal for moving large volumes of air through workspaces. They can be used to remove stale air, introduce fresh air or improve overall airflow during painting projects.
For many applications, a portable fan combined with ducting can dramatically improve working conditions and reduce the build up of fumes.
The key is ensuring airflow moves contaminants away from the operator and out of the work area rather than simply circulating them around the room.
View Our Ventilation Fans Here
When Do You Need an EX Rated Fan?
If you're working with solvent based paints and coatings, a standard ventilation fan may not be suitable. Solvent vapours can create potentially hazardous environments where ignition sources must be carefully controlled.
This is where EX rated ventilation fans come into their own.
EX rated fans are specifically designed for use in hazardous environments and should always be paired with suitable flame retardant ducting.
If you're unsure whether your application requires an EX rated solution, it's always worth seeking advice before starting the job.
View Our Explosion Proof Ventilation Fans Here
Understanding Overspray
Overspray occurs when paint particles fail to land on the intended surface and drift into the surrounding environment.
Excessive overspray will increase material costs, create additional clean up work and contaminate nearby surfaces. It also contributes to poor air quality by increasing the amount of airborne paint particles in the workspace.
The more overspray you create, the harder your ventilation and extraction systems need to work.
How to Reduce Overspray
Reducing overspray starts with good spray painting technique.
Using the correct spray tip is one of the most important factors. A tip that is too large can apply more material than necessary and increase waste.
Maintaining the correct spray distance is equally important. Holding the gun too far from the surface can increase overspray while reducing transfer efficiency.
Pressure should also be carefully adjusted to suit the coating being applied. Excessive pressure can create unnecessary atomisation and increase airborne paint particles.
Small adjustments in setup can often result in noticeable improvements in finish quality and material usage.
Capturing Overspray At The Source
One of the most effective ways to control overspray is to capture it before it spreads throughout the workspace.
Portable filter boxes and overspray extraction systems are specifically designed for this purpose. These systems draw contaminated air through filtration media that captures paint particles before cleaner air is discharged.
They are particularly useful for:
Automotive refinishing
Cabinet and joinery spraying
Onsite repainting projects
Industrial maintenance work
DIY spray painting projects
For workshops without access to a dedicated spray booth, portable overspray extraction systems can provide a practical and cost effective alternative.
View Our Filter Box Range Here
Using Activated Carbon Filters for Odour Control
Ventilation and extraction remove most airborne contaminants, but solvent odours can still linger in enclosed spaces. Activated carbon filter media helps reduce odours from paints, solvents, adhesives and other chemicals by adsorbing vapours as air passes through the filter.
Used alongside ventilation and extraction systems, it can provide an additional layer of air quality control in workshops, spray painting areas and confined workspaces.
View Our Carbon Filtration Here
Don't Forget Humidity
One challenge often overlooked during spray painting is humidity. During winter, many New Zealand workshops experience increased moisture levels due to cold temperatures and reduced airflow. Excess humidity can affect drying times, contribute to condensation and impact the quality of some finishes.
In certain environments, dehumidifiers can help create more stable conditions for spray painting, particularly when combined with effective ventilation and extraction.
Managing airflow and moisture together often delivers better results than focusing on temperature alone.
Better Airflow Means Better Results
Successful spray painting is about controlling the entire environment, not just the coating being applied.
A combination of effective ventilation, targeted extraction and good spray painting technique can help:
Improve air quality and reduce fumes
Minimise overspray and lower material waste
Improve finish quality
Create a cleaner workspace
At Millin, we supply a wide range of ventilation fans, EX rated fans, ducting, overspray filter boxes and extraction systems designed to help painters create safer, cleaner and more productive work environments.
If you're planning a spray painting project and need advice on airflow, extraction or overspray control, our team is always happy to help.