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Rohner · Mixing room

Rohner Paint Mixing Room

Filter kit, alternatives, and current pricing for the Paint Mixing Room.

Rohner model • Paint Mixing Room

Rohner Paint Mixing Room Filter Fitments

Every gallon that goes through your booth gets opened, reduced, and stirred somewhere first. The mix room's whole contribution to finish quality happens before the gun is loaded: filtered makeup air keeps airborne dust off open containers and mixing cups, while constant extraction keeps vapor concentration low enough to be safe to occupy and legal to operate. Because it draws air around the clock in most shops, the intake media accumulates plant dust steadily even though nothing is sprayed inside. It is the easiest filter in the shop to forget, and one of the more consequential.

Quick answer

A paint mixing room is not a spray booth, and its filters do a different job. The Rohner Paint Mixing Room is a ventilated enclosure for storing, mixing, and staging coatings: a continuously exhausted 1,200 CFM space that keeps solvent vapors diluted and swept out while filtered intake air keeps dust away from open paint. Rohner builds it in an 11-variant family, from 6 to 12 feet wide and 6 to 18 feet deep at 8 feet of interior height, running on ordinary 115V single-phase power. There is no overspray in a mix room, so the consumable program is intake filtration rather than exhaust arrestor media.

By BoothFilterPro Editorial · Filter Fitment Desk · Updated Jul 15, 2026
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How Paint Mixing Room shops choose filters

Intake side. Intake filtration is the whole consumable story here. Air pulled into the room passes through panel media that strips plant dust before it reaches open coatings, scales, and mixing equipment. As that media loads, airflow through the room drops, weakening vapor dilution, and the filter begins bleeding accumulated dust directly upstream of open paint.

No exhaust media to buy. Nothing is atomized in a mix room, so there is no overspray and no arrestor stage; the extraction path moves vapor, not particulate. That makes the room's filter spend small and easy to bundle onto the same recurring order as your booth media.

Sizing. With 11 variants across the family (6' to 12' wide, 6' to 18' deep), intake panel dimensions differ by configuration. Our record for this model comes from Rohner's catalog documentation and sits in the verification queue, so include your room's footprint or nameplate in a fitment check and we will confirm the panel spec before you standardize the reorder.

Regulatory landscape

Mix rooms are primarily a fire-code subject. NFPA 33 addresses mixing rooms used with flammable and combustible materials, including continuous mechanical ventilation, and your local fire authority will generally expect the ventilation running whenever the room holds open product. OSHA's flammable liquid and ventilation rules point the same direction: enough airflow to keep vapor concentrations down, which a plugged intake filter quietly undermines. On the EPA side, NESHAP 6H is about spray application, not mixing, though a maintained and documented mix room supports the same inspection file. The compliance risk is discovering the ventilation has been starved for months because nobody owned the panel change.

Who runs the Paint Mixing Room

Collision repair shops are the biggest population: a mix room next to the booth is standard in any modern refinish layout. Industrial finishing operations that batch-mix primers and topcoats for production runs use the deeper variants as combined mixing and staging rooms. And multi-booth shops, where one mix room feeds two or three booths, run the room's ventilation continuously all shift, which shortens intake media life compared with a single-booth shop even though the room itself sees no more spraying. In every case the room runs on common 115V single-phase power, so it often outlives booth upgrades around it.

Paint Mixing Room filter FAQs

Is a paint mixing room the same thing as a small spray booth?

No. A spray booth captures atomized overspray with exhaust filtration; a mixing room is a ventilated enclosure that manages solvent vapor and keeps dust off open coatings. Nothing should ever be sprayed in a mix room, and it consumes intake media only.

How often should mix room intake filters be changed?

On a calendar, because loading is gradual and visual inspection misleads. Many shops pair the mix room panel change with every second booth intake change as a simple rule, then adjust if the room runs continuously or the plant is dusty.

Does a dirty intake filter really affect paint quality if nothing is sprayed in the room?

Yes, two ways. Loaded media begins shedding trapped dust into the room's airstream, directly above open cans and mixing cups, and reduced airflow lets dust settle rather than sweep through. Contamination picked up in the cup shows in the finish just as surely as booth-side dirt.

Which size Rohner mix room do I have, and does it matter for ordering?

It matters for panel dimensions. The family spans 11 sizes from 6 to 12 feet wide and 6 to 18 feet deep, and our fitment record for this model is catalog-documented pending field verification. Send the room's footprint or a nameplate photo with a fitment check and we will confirm the intake panel spec.

Do fire codes actually require the ventilation to run all the time?

NFPA 33 expects mechanical ventilation for mixing rooms holding flammable and combustible materials, and most local fire authorities interpret that as ventilation operating whenever open product is present, with many shops simply running it continuously. Just remember that continuous runtime shortens the intake media cycle.

Sources

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