The recurring question in large-structure finishing projects is not what size the chamber should be. It is how many chambers there are — and the answer comes from the process, not the catalogue.
Running separate prep and paint cells is not an organisational preference. Preparation, stripping and inspection precede coating, and each stage has different air and extraction requirements.
What actually differs between the stages
Preparation generates dust, particulate and stripping residue. Spraying generates overspray and solvent vapour. Extraction sized for one is not sized for the other, and filtration chosen for one is consumed quickly by the other.
| Item | Preparation stage | Coating stage |
|---|---|---|
| What is extracted | Dust, particulate, stripping residue | Overspray and solvent vapour |
| Filtration | Stop and pre-filtration | Up to three-stage bag and high-efficiency filtration at 98% |
| What governs configuration | Surface cleanliness before spraying | Spray environment and air change |
| Cost of combining | Dust remains airborne during spraying | Filtration consumed before its service interval |
Separation does not always mean two buildings
Separation means the two stages do not share one environment on one set of requirements. That can be achieved with a dedicated preparation chamber carrying its own extraction ahead of the coating chamber, or through a different air-handling arrangement — the process decides, not a general rule.
For that reason the chamber count is defined after the stages are reviewed, never before.
What the decision costs either way
Two chambers mean more floor area and two air-handling systems. One chamber means less area and a weaker result in one of the stages. The trade sits upstream of the purchase decision and turns on throughput and on whether stripping is routine or occasional.
Frequently asked questions
Can a facility start with one chamber and add the second later?
It can, provided the area and the electrical supply are prepared for the extension from the outset. The decision belongs to the site survey stage, because stack and duct positions change with the count.
What information sets the chamber count?
The process stages as they run today, the number of parts per cycle, and the available site area. Those three build the concept.
Does the preparation chamber use the same range?
A preparation chamber belongs to the prep stations and mixing rooms family and carries its own extraction requirements. The coating chamber follows the published paint booth range up to 24,000 mm long.
Read also
Next step
Send your process stages as they run today and the number of parts per cycle, and we will come back with a one- or two-cell concept built around them. Talk to a specialist. More detail on the aerospace, marine and rail industry page.