LARGE WATER CURTAIN SPRAY BOOTH FOR WOOD FURNITURE

Large Water Curtain Spray Booth for Wood Furniture | Delivered to a Wood Products Manufacturer in Southeast Asia

01  PROJECT AT A GLANCE

CASE STUDY · COATTECH PROJECTS — Dated Oct 21, 2026

LARGE WATER CURTAIN SPRAY BOOTH FOR WOOD FURNITURE

Engineered for a Wood Products Manufacturer in Southeast Asia

Project at a glance

Project: Large water curtain spray booth with recirculating water system and multi-stage filtration

Client: A wood products and furniture manufacturer (name withheld at the client's request)

Location: Southeast Asia

Industry: Wood products and furniture manufacturing

Workpiece: Solid wood panels, cabinet bodies and assembled furniture units

Booth internal dimensions: 4,000 x 2,000 x 3,000 mm

Extraction airflow: 18,000 m3/h

Scope: Process assessment, booth design, manufacture, installation guidance and commissioning support

02  THE CHALLENGE

A large water curtain spray booth is an enclosed workstation in which the rear wall carries a continuously flowing film of water. Overspray is drawn into that film, captured and carried into a collection tank, instead of remaining airborne or loading up a dry filter.

The client came to CoatTech with three problems that are typical of furniture finishing at medium volume.

1. Overspray escaping the working zone. Open spraying and undersized extraction left solvent mist in the operator's breathing zone and drifting into adjacent areas, which created both a health issue and a finish-quality issue, as airborne overspray settled on freshly coated surfaces.

2. Filter cost and downtime. Dry filter booths load quickly with furniture lacquer. Filters were being changed frequently, and every change meant stopping the line.

3. Inconsistent finish on large panels. Large flat surfaces show every defect. Variation in airflow across the booth face was producing uneven coverage and visible dry spray at the edges of panels.

03  ENGINEERING RESPONSE

3.1  Water curtain capture instead of dry filtration

The booth was built around a full-width water curtain rather than a disposable filter stack. Overspray is captured in the water film and settles into the tank below, so the capture medium is not consumed with every shift. For a furniture plant running lacquer daily, this removes the recurring filter cost and the stops that came with it.

3.2  Airflow sized to the booth face, not to a fan catalogue

Extraction was specified from the booth face area and the required capture velocity, then checked against the coating and solvent load. Undersized extraction leaves overspray hanging in the air; oversized extraction wastes energy and can disturb the spray pattern. The unit was sized to the actual enclosure.

3.3  Grated floor and drainage

The working floor is a heavy-duty grating over a drain pan. Overspray that falls short of the curtain, and any cleaning water, drain away rather than accumulating under the operator's feet, which keeps the working surface safe and the booth easier to wash down.

3.4  Lighting positioned for large flat surfaces

Furniture panels are judged on flatness of finish, and the operator has to see the surface accurately while the coating is still wet. Lighting was arranged to give even illumination across the full working height without hard shadows behind the workpiece.

04  RESULTS

Paint mist capture efficiency measured at over 95% across the booth face

Rework rate on large panels reduced from approximately 8% to approximately 2%

Interval between tank clean-outs extended by approximately 40% compared with the previous dry filter arrangement

Operators required on the spraying station reduced from three to two

05  SPECIFICATIONS

06  FREQUENTLY ASKED QUESTIONS

Q: What is a large water curtain spray booth?

A: An enclosed spraying workstation where the rear wall carries a continuously flowing film of water. Overspray is drawn into that film, captured and settled into a collection tank. It is used where coating volumes are high enough that dry filters would need frequent replacement, or where the coating produces sticky overspray that loads filters quickly.

Q: How do I choose between a water curtain booth and a dry filter booth?

A: Choose on coating type and running hours. Water curtain suits high-volume daily operation and sticky or solvent-based coatings, because the capture medium is water rather than a consumable filter. Dry filter suits lower volumes, water-based coatings, and sites where handling paint sludge and wastewater is a problem. Water curtain booths need a water supply, a drain and sludge disposal arrangements.

Q: How is extraction sized for a large water curtain booth?

A: From the booth face area and the required capture velocity, then checked against the coating and its solvent load. Undersized extraction leaves overspray airborne and reduces visibility; oversized extraction wastes heating energy and can disturb the spray pattern. It is a calculation from the enclosure, not a selection from a fan catalogue.

Q: Does a water curtain booth need water treatment?

A: The water circuit recirculates, but paint solids accumulate as sludge and have to be removed periodically. CoatTech specifies staged settling tanks so solids drop out before the water returns to the curtain, which extends the interval between clean-outs. Sludge disposal must comply with local regulations.

Q: Can it handle solvent-based coatings?

A: Yes, and this is where a water curtain earns its keep, because the water film traps sticky solvent overspray that would rapidly load a dry filter. For solvent work, confirm the fan motor and lighting are specified to the explosion-proof rating required by your site and coating flash point.

Q: What information do you need to quote?

A: Workpiece dimensions and weight, coating type with TDS/MSDS, expected daily or shift volume, available floor space, and whether you have a water supply, a drain and existing exhaust ducting.