Marathon Finishing · Downdraft
Marathon Finishing Full Downdraft
Filter kit, alternatives, and current pricing for the Full Downdraft.
Required filters
Recommended kit for this booth
3 matched filters across 3 slots.
Complete kit total · $527.71
Intake side (clean air going in) (2 slots)
AMU pre-filter
Pleated AMU pre-filter panel · 20x72
Special order · 1–2 weeksAFT 3-Ply Link Prefilter 25x72
BFP-PP-AFT-3PL-2072· 60–90 day cycle$183.87
Ceiling intake
Ceiling diffusion polyester · 48x57.5
Special order · 1–2 weeksFiltrair FF560GX 48x56 Ceiling Diffusion (PA560G-10)
BFP-CD-FILTRAIR-4856· 30–60 day cycle$282.00
Exhaust side (overspray coming out) (1 slot)
Pit exhaust
Fiberglass exhaust arrestor · 20x20
Special order · 1–2 weeksAFT 15-gram Fiberglass Pad 20x20
BFP-FG-AFT-15G-2020· 7–14 day cycle$61.84
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Marathon Finishing Full Downdraft Filter Fitments
Marathon's Full Downdraft sits in the production-collision and industrial-finishing tier of the Marathon airflow-design lineup. It carries broad collision-shop footprint across the Marathon dealer channel, independent shops, multi-location groups, and dealership body shops that selected Marathon for the airflow-design flexibility and US-origin manufacturer support. Marathon's brochures are form-gated rather than direct-download, so the verified-fitment record draws from authorized-distributor parts cross-references plus accumulated dealer-relationship data.
Quick answer
The Marathon Finishing Full Downdraft is Marathon's full-downdraft offering from the airflow-design series, ceiling-plenum diffusion intake plus exhaust-pit pad media in a closed-enclosure downdraft configuration. Source confidence on this fitment is authorized-dealer cross-reference, kit ships with quote-back form to upgrade to field-verified before subscription auto-renews.
How Full Downdraft shops choose filters
Intake side. Ceiling-plenum diffusion intake using polyester or fiberglass diffusion media filling the full-area ceiling panel grid above the work zone. The Marathon Full Downdraft's ceiling configuration is documented in the authorized-dealer parts catalogs; the verified-fitment record draws from those references with quote-back paste-backs upgrading the row to field-verified over time.
Exhaust side. Pit-mounted exhaust pad media in the floor-grate exhaust pit. Fiberglass-arrestor pad is the dominant spec across the Full Downdraft installed base; polyester-arrestor as the upgrade for higher-solids and waterborne. The new 25-entry filter media taxonomy on this site distinguishes 12 exhaust types, fiberglass-arrestor, polyester-arrestor, accordion-paper, paper-mesh, pocketed-paper, cube-overspray-arrestor, tower-exhaust-pocket-bag, plus five more, alongside 9 intake types and 4 specialty types. The Full Downdraft kit names its specific exhaust slug per pit position.
Slot expectations queued for re-mapping. The booth-model slot expectations row for the Marathon Full Downdraft is currently flagged in our verification queue as pending re-mapping against the new 25-entry media taxonomy (the platform expanded from 9 to 25 media types on 2026-05-09). The kit you receive is correct, we're updating the metadata record, not the physical fitment.
Cycle math. Industrial finishing on a Marathon Full Downdraft typically runs ceiling intake every 30-50 days and exhaust-pit pad every 75-110 days under normal volume; collision-shop deployments compress those numbers, exhaust-pit at 7-21 days under high-production tempo. AMU pre-filter cycles 60-90 days. Subscriptions auto-tune by ZIP and throughput profile.
Regulatory landscape
Marathon Full Downdraft installations face the standard regulatory framework, state DEP authority, regional AQMDs, federal OSHA spray-finishing standards (29 CFR 1910.94). Independent collision shops typically fall into NESHAP Subpart HHHHHH 6H Area Source category; industrial finishing operations may face Subpart-specific applicability depending on the coatings sprayed. Verified-fitment kits maintain the original capture rating; the catalog separates aerospace-rated kits from collision and standard-industrial kits explicitly.
Who runs the Full Downdraft
Three populations dominate the Marathon Full Downdraft installed base. First, mid-to-high-volume independent collision shops that picked Marathon for the airflow-design flexibility plus US-origin manufacturer support. Second, multi-shop collision groups that standardized on Marathon Full Downdraft across production-tier locations. Third, industrial-finishing operations doing equipment, fabrication, or specialty-product coating where the full-downdraft airflow profile matched the coating spec. Each archetype draws different cycle cadences from the same fitment family.
Full Downdraft filter FAQs
How do I confirm I have a Marathon Full Downdraft versus a different airflow design?
The Marathon nameplate names the airflow configuration explicitly, "Full Downdraft" is distinct from reverse airflow, side downdraft, modified downdraft, front airflow, and open face. The Filter Finder accepts a nameplate photo plus four interior shots including the ceiling and the floor pit for verified-fitment matching.
What's the source confidence on this fitment, and what does that mean for me?
**Distributor-cross-ref (authorized-dealer cross-reference)**, kit ships with quote-back form to upgrade to field-verified. The first kit shipment includes a measurement quote-back form. When you paste back your verified measurements, the record upgrades to field-verified and your subscription locks in. If your measurements differ from the cross-ref data, we ship a corrected kit at no charge.
Why don't I see Marathon brochures available as direct downloads?
Marathon distributes their brochure documentation through a form-submission system on their website rather than as direct PDF downloads. Our verified fitments compile data from authorized-distributor parts cross-references plus accumulated dealer-relationship data; the kit ships with the relevant capture-efficiency data for your verified booth model.
Is the AMU pre-filter included in the Full Downdraft subscription?
It's a separate subscription cadence. AMU pre-filter at 60-90 days; ceiling diffusion at 30-50 days for industrial finishing or 30-45 for high-production collision; exhaust-pit pad at 7-30 days. Subscriptions deliver each position on its own calibrated schedule.
Can I run waterborne basecoat through a Marathon Full Downdraft?
Yes, full downdraft is the airflow configuration most accommodating to waterborne. The ceiling-down airflow sweeps overspray cleanly into the pit pad. Polyester-arrestor as the upgrade exhaust media often makes sense for waterborne shops; the catalog separates the SKUs.
What if my Marathon Full Downdraft installation pre-dates the current dealer cross-references?
Older Marathon Full Downdraft installations still have direct fitment matches in the modern equivalents in most cases. The Filter Finder photo set plus nameplate identification routes pre-cross-ref installations to the closest verified fitment family with a quote-back upgrade path.
Sources
Primary references cited on this page.
- Marathon Finishing Systemshttp://marathonspraybooths.com/
- Authorized-Dealer Parts Cross-Reference (authorized-dealer cross-reference)internal:distributor-cross-ref-2026-04
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