Junair · Downdraft
Junair 7 Series
Filter kit, alternatives, and current pricing for the 7 Series.
Fitment data is being verified. Our team is still cross-referencing manufacturer specs for the 7 Series. Confirm filter sizes with WERCS before ordering: request a fitment confirmation.
Junair model • 7 Series
Junair 7 Series Filter Program
Ceiling intake, floor exhaust, and AMU media for Junair's flagship downdraft, sized to your booth through a fitment check before anything ships.
Junair builds spray booths in the UK and trades as JBI in some markets, and the 7 Series sits at the head of that range. It is the booth Junair points collision and refinish buyers to when they want the full-specification downdraft rather than a cost-trimmed package. That matters for filters: flagship downdrafts get worked hard. Shops buying at the top of the ladder run higher throughput and tighter finish standards, which shortens intake cycles and makes a documented, repeatable filter program worth setting up properly from the first change.
Quick answer
The Junair 7 Series is a downdraft spray booth at the top of Junair's booth range, documented in the manufacturer's current catalog. As a downdraft, it draws heated make-up air through ceiling diffusion media and pulls overspray down through floor-level exhaust arrestor. The working filter program is ceiling intake panels or blanket media, exhaust arrestor pads or rolls at the floor, and pre-filter media in the air handling unit. This model is in our verification queue, so we confirm your panel and pad sizes through a fitment check or quote before bulk ordering rather than shipping assumed dimensions.
How 7 Series shops choose filters
Intake side. In a downdraft like the 7 Series, the ceiling plenum is the last filtration stage before air reaches the panel you are painting, so ceiling media quality shows up directly in the finish. Full-ceiling diffusion media in this class of booth is typically a synthetic blanket or panel set with a tacky downstream face to hold fine dust. Because our record for this model does not document panel counts or dimensions, we do not quote ceiling sizes from assumption. Send the nameplate and a ceiling grid photo, or measure one panel, and the fitment check locks the spec.
Exhaust side. Floor-level exhaust arrestor does the heavy lifting on overspray capture. Fiberglass arrestor pad is the usual starting point, with polyester arrestor as the step up when high-solids or waterborne work loads fiberglass faster than the change cycle wants. Undersized or badly seated exhaust media is the fastest way to push a downdraft out of pressure balance, so exhaust sizes go through the same confirmation step as the ceiling.
AMU pre-filter. Heated downdrafts run pre-filter media ahead of the burner and fan in the air make-up unit. It is the cheapest media in the booth and it protects the most expensive hardware. If your 7 Series runs an AMU, include its pre-filter in the same fitment check so the whole booth cycles on one plan.
Regulatory landscape
Most body shops spraying automotive coatings in a 7 Series fall under EPA NESHAP Subpart HHHHHH (the 6H rule), which requires spraying in a filtered enclosure and maintaining exhaust filtration per manufacturer guidance, with records. OSHA 29 CFR 1910.94(c) governs spray finishing ventilation, and clogged exhaust media that drags down airflow is a 1910.94 problem before it is a finish problem. NFPA 33 treats overspray accumulation as fire load, so a scheduled change cycle with documented dates covers the fire code posture and the 6H paper trail in one habit.
Who runs the 7 Series
The 7 Series shows up first in higher-volume collision repair shops, where the booth is the production bottleneck and filter deliveries need to run on a fixed cadence, not reorder-when-empty. Second, dealership body shops whose OEM certification programs expect name-brand booth equipment maintained to spec, where a delivery record doubles as the maintenance log. Third, quality-focused independents refinishing late-model vehicles, where the owner picked the flagship booth deliberately and expects the consumables program to match it.
7 Series filter FAQs
Which filters does a Junair 7 Series actually take?
As a downdraft, it runs ceiling intake diffusion media, floor-level exhaust arrestor, and pre-filter media in the air make-up unit. The exact panel dimensions and counts vary with booth size and configuration, and this model is still in our verification queue, so we confirm sizes against your specific booth through a fitment check before shipping a bulk order.
Why is there a fitment verification step instead of a listed kit?
The 7 Series entry in our catalog comes from the manufacturer's published range, not yet from field-verified slot measurements. Rather than guess dimensions and ship the wrong media, we ask for a nameplate photo and a measurement or two. Once confirmed, reorders lock to that record.
How often should I change ceiling media in a booth like this?
There is no universal number: paint volume, shop dust load, and pre-filter condition all move it. Change ceiling media on a schedule based on spray hours, watch the manometer for rising pressure drop, and tighten the interval if dirt nibs appear in finishes. Exhaust arrestor usually cycles faster than the ceiling.
Can I use the same exhaust media as a cross-flow booth?
The media families overlap (fiberglass and polyester arrestor are common to both), but downdraft exhaust sits in floor pits or basement grids and is sized differently from a cross-flow's rear exhaust wall. Buy by confirmed slot dimension and media type, not by booth-brand assumption.
Does a loaded exhaust filter explain overspray settling back on panels?
Often, yes. When floor exhaust media loads up, downward airflow slows, the booth drifts toward positive pressure, and overspray hangs in the air instead of being pulled down. Change the exhaust arrestor first and recheck pressure balance; if it persists with fresh media, the cause is mechanical and worth a service call.
Sources
Primary references cited on this page.
- Junair 7 Series manufacturer product pagehttps://www.junair-spraybooths.co.uk/products/spray-booths/
- EPA 40 CFR Part 63 Subpart HHHHHH (NESHAP 6H)https://www.epa.gov/stationary-sources-air-pollution/national-emissions-standards-paint-stripping-and-miscellaneous
- OSHA 29 CFR 1910.94(c), Ventilation: spray finishing operationshttps://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.94