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Metro fitments • Seattle

Paint Booth Filters for Seattle Shops

PSCAA Regulation III media + NESHAP Subpart GG 3-stage chromate kits for the Boeing supply chain

Seattle is one of the most demanding filter markets in the country, and not because of the weather. The Puget Sound Clean Air Agency runs Regulation III for surface coating with a level of recordkeeping rigor most regions skip, and the regional aerospace supply chain, anchored by Boeing across Renton, Everett, Auburn, and the surrounding tier-supplier base, runs many booths under NESHAP Subpart GG with 3-stage chromate filtration that pushes capture far beyond regulatory minimums. We stock kits sized for both populations: collision booths under PSCAA and aerospace finishing booths under Subpart GG.

Quick answer

Seattle paint booths run under Puget Sound Clean Air Agency Regulation III plus federal NESHAP Subpart GG for aerospace coatings (Boeing supply chain). Filter selection follows two distinct paths: PSCAA-compliant kits for collision shops and 3-stage chromate filtration with HEPA-class final stages for Subpart GG aerospace booths. Subscription delivery records satisfy PSCAA recordkeeping by default.

By Ben Kurtz · Filter Fitment Lead, 20+ years in paint-booth service · Updated May 9, 2026
Find your PSCAA + Subpart GG-ready filter kit

How Seattle shops choose filters

PSCAA Regulation III sets the operating expectations for spray-finishing sources in King, Pierce, Snohomish, and Kitsap counties, the Puget Sound region. Annual reporting, source testing at the larger thresholds, and unannounced inspections are all part of the standard cadence. Inside that envelope, two distinct shop populations operate. Automotive collision shops across the metro size to booth-brand fitments and PSCAA-compliant media classes; the cycle math is moderately affected by Pacific Northwest marine humidity but not dramatically. Aerospace finishing booths, supporting Boeing's commercial and defense programs plus the regional tier-supplier base, operate under federal NESHAP Subpart GG (the chromium aerospace coatings rule), which prescribes a 3-stage filtration approach with HEPA-class final stages and stringent capture documentation. Filter selection in those booths is engineering-driven first and PSCAA-compliant by default. Every kit on this catalog is tagged for the shop archetype it serves.

Climate & replacement cycles

Seattle's climate works on filter cycles in two distinct seasonal modes. The wet season, roughly October through April, sustains relative humidity above 70 percent through most workdays, with a pronounced moisture load on intake pre-filters in any building envelope that does not seal tight. The dry season, June through September, runs sunny and warmer with notably lower humidity, and intake cycles stretch back toward catalog baseline. The marine influence keeps temperature swings narrow year-round; you don't get the brutal humidity of Houston or the dry heat of Phoenix, but you get sustained moderate humidity for half the year that compresses wet-side cycles meaningfully. Aerospace booths under Subpart GG run closer to a fixed engineering cycle independent of climate; collision booths under PSCAA see the seasonal swing and benefit from a subscription that flexes through it.

Seattle pages should center the Boeing supply chain and NESHAP Subpart GG (Aerospace) 3-stage chromate filtration alongside collision.

Regulatory landscape

Three regulatory authorities shape filter purchases in the Puget Sound region. The Puget Sound Clean Air Agency holds primary responsibility under Regulation III for surface-coating sources across the four-county area, with permits administered locally and inspections conducted on a rolling basis. The Washington Department of Ecology sets statewide air-quality rules under WAC 173-400 and handles permits outside the PSCAA service area. Federal NESHAP Subpart GG applies to aerospace coatings facilities under EPA authority, with implementation handled through PSCAA in the Seattle region. Federal OSHA's spray finishing standard 29 CFR 1910.107 covers worker safety; Washington's state OSHA-equivalent (WISHA, administered by L&I) layers state-specific requirements on top. The clean compliance posture for any Seattle shop is a recurring delivery cadence with metro-tagged packing slips, a brief technician install log at the booth, and the relevant spec sheets, Subpart GG capture data for aerospace booths, PSCAA-relevant capture data for collision, on file.

Who buys filters in Seattle

Seattle filter demand concentrates in three distinct populations. The first is the regional aerospace supply chain anchored by Boeing, production at Renton, widebody assembly at Everett, machining and finish at Auburn, plus the tier-1 and tier-2 supplier base scattered across south King and north Pierce counties, with paint booths running under NESHAP Subpart GG and 3-stage chromate filtration. The second is the Puget Sound collision belt, Seattle, Bellevue, Tacoma, Everett, Kent, Renton, Federal Way, Kirkland, Auburn, Redmond, running high-throughput booths under PSCAA Regulation III with the documentation rigor that implies. The third is marine refinishing along the Sound and across Puget Sound shipyard remnants, with intake media chemistry tuned for salt aerosol and continuous moisture exposure. Each archetype draws different kits.

Within Washington

Seattle filter FAQs

What's the difference between a PSCAA-compliant kit and a NESHAP Subpart GG kit?

A PSCAA-compliant kit is sized for the booth brand and model and ships with media whose published capture efficiency satisfies the agency's surface-coating requirements. A NESHAP Subpart GG kit is sized for an aerospace coating booth running 3-stage filtration with HEPA-class final stages and full chromium-capture documentation. The Subpart GG kit costs more per cycle and ships with capture-test data formatted for federal aerospace recordkeeping. The catalog separates them explicitly so you cannot accidentally put a collision-class kit in an aerospace booth.

Does Seattle's wet season really shorten my filter cycle?

On the intake side, yes — meaningfully. A Seattle collision booth running normal volume during October-April typically burns through intake media at roughly 70 to 80 percent of the dry-season cycle length, driven by sustained marine humidity in any building envelope that doesn't seal tight. The dry season runs closer to catalog baseline. Subscriptions auto-flex by season for Puget Sound ZIP codes; aerospace booths on engineering-spec cycles are largely independent of the seasonal swing.

I'm a Boeing tier-2 supplier with a small finish booth — do I still need Subpart GG documentation?

If your booth is being used to apply chromated primers or topcoats covered under the aerospace coatings NESHAP, yes — your shop falls under Subpart GG regardless of size. The catalog flags Subpart GG-rated kits explicitly and includes the capture-test documentation in every shipment. If your booth is not running chromated coatings, the more general PSCAA-compliant kits cover you under Regulation III without the aerospace overhead.

Do you ship next-day to Seattle, Bellevue, Tacoma, and Everett?

Standard shipping reaches all major Puget Sound ZIP codes in one to two business days from our regional warehouse. Next-day is available on select kits to Seattle, Bellevue, Tacoma, Everett, Kent, Renton, Federal Way, Kirkland, Auburn, and Redmond ZIP codes; the cart surfaces the option at checkout when your address qualifies. Subscription deliveries land on the cadence you set with one-click pull-forward for PSCAA inspection windows.

What does PSCAA actually require for paint booth maintenance documentation?

PSCAA expects a current maintenance log accessible at the booth, with filter replacement dates, brand and spec sheet for the installed media, and the technician on each install. Higher-throughput shops face annual source-testing requirements; aerospace coatings shops have separate Subpart GG capture-documentation expectations on top. A subscription with metro-tagged delivery records and the spec sheet on file at the booth covers the recordkeeping baseline by default.

Are there filter differences between a Renton aerospace booth and a Tacoma body shop?

Yes, substantially. Renton aerospace booths covered under Subpart GG run 3-stage filtration with HEPA-class final stages and capture-test documentation in every install record. Tacoma body shops run on PSCAA-compliant media tuned for the booth brand and collision-volume cadence. The two kits are not interchangeable. The catalog separates them explicitly and the Filter Finder routes you to the correct family based on the booth nameplate and the coatings you spray.

Sources

Primary references cited on this page.

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