Telescopic Spray Booth Maintenance: Filter Change Intervals, Fabric Care and Running Costs

Provided by Lin Cong, Technical Director, MUSI Technology · Published October 1, 2026 · Last reviewed October 1, 2026

Quick answer: Keep a differential pressure gauge across the filter wall and change the labyrinth paper filters at about 250 Pa; replace glass-fibre bags when their resistance reaches the same value; change activated carbon by solvent load and the RCO catalyst at about 8,000 hours; inspect fabric, fold guards, rails and drive wheels weekly; and budget running cost from fan power (45-75 kW), drive power during travel and filter consumption.

Interior of a telescopic spray booth with dry paint-mist filter wall, ceiling lighting and yellow rail-mounted columns
Interior with the dry filter wall and ceiling lighting; the gauge across the wall sets the filter change interval.

Filter wall

Labyrinth paper filters hold 14-18 kg of paint per square metre and are changed when the pressure drop reaches about 250 Pa, not on a calendar. Glass-fibre bags behind them start at 7-40 Pa and are changed at 250 Pa. Spent filters are paint-contaminated waste. Oil-film units are drained and refilled on a schedule set by paint volume.

Treatment unit

Carbon cassettes are swapped when the outlet sampling shows breakthrough; keeping a spare set lets the swap happen while the fan runs. UV lamps are replaced by hours. In an RCO the honeycomb carbon regenerates itself and the palladium-platinum catalyst is replaced at about 8,000 hours; the temperature probe, dilution damper and flame arrestor are checked at each service.

Enclosure, rails and drives

Weekly: walk the rails and clear anything the sweeper missed, check the fabric for tears and paint build-up at the folds, confirm the fold guards are in place. Monthly: test both limit switches at each end and the drive interlock, check chain tension on the twin drive wheels, look at the gearbox oil level. The rubber-sheathed cables last five to eight years; replace at the first sign of cracking. The fabric is a wear item replaced after several years depending on solvent exposure and sunlight.

Item Change when Driver
Paper filters at 250 Pa on the gauge paint volume
Glass-fibre bags at 250 Pa paint volume
Carbon cassettes at breakthrough solvent load
RCO catalyst about 8,000 h operating hours
UV lamps by lamp hours operating hours
Fabric several years solvent, UV
Cables 5-8 years flexing cycles

How to estimate running cost

Fan power dominates: a 75 kW fan for 8 hours a day at a power factor of 0.8 is the number most plants start from; a VFD cuts it while filters are new. Drive motors run only during travel, a few minutes per batch. Add lighting (about 1 kW), filter consumption from the paint volume, and carbon or catalyst on their intervals. An RCO adds its start-up heater but saves carbon replacement, which is why it wins on daily painting.

FAQ

Can the filters be cleaned and reused? No; paper and glass-fibre media are single-use.

How do I know the carbon is spent? Outlet sampling, or a fixed interval calculated from paint and thinner consumption.

Does the booth need lubrication? Gearbox oil and drive chains; the frames have plain guides that only need to be kept clean.

What spares should be on site? One set of paper filters and bags, spare Ex LED units, a limit switch, and a drive chain.

Where MUSI Technology fits

MUSI supplies filter media, carbon and catalyst for the booths it installs and includes the maintenance schedule in the handover manual. Product details, typical sizes and the quotation checklist are on the telescopic mobile spray booth page.

Provided by Lin Cong, Technical Director, MUSI Technology

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