Accudraft · Semi-downdraft
Accudraft MX Semi Downdraft
Filter kit, alternatives, and current pricing for the MX Semi Downdraft.
Required filters
Recommended kit for this booth
3 matched filters across 3 slots.
Complete kit total · $54.85
Intake side (clean air going in) (2 slots)
AMU pre-filter
Pleated AMU pre-filter panel · 20x25x2
In stock · ships in 24hPleated AMU Pre-Filter Panel 20" x 25" x 2"
BFP-AMUP-20X25X2· 60–90 day cycle$14.95
Ceiling intake
Ceiling diffusion polyester · 20x25
In stock · ships in 24hCeiling Diffusion Polyester Panel 20" x 25"
BFP-PCD-20X25· 30–60 day cycle$14.95
Exhaust side (overspray coming out) (1 slot)
Exhaust Wall
Accordion / Andreae paper · 20x20
Special order · 1–2 weeksAccordion Paper Baffle Arrestor 20" x 20"
BFP-ACCP-20X20· 14–28 day cycle$24.95
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Accudraft MX Semi Downdraft Filter Fitments
The MX Semi Downdraft (often referenced as the MX300 in dealer-channel parts catalogs) is Accudraft's small-shop and cost-conscious answer to the full-downdraft MX. The semi-downdraft airflow geometry, intake at the ceiling, exhaust through a partial floor pit with side wall returns, reduces the slab and pit work required for installation and lowers the entry cost. The fitment family is distinct from the full-downdraft MX and the verified record draws from authorized-dealer cross-references with provenance disclosed up front.
Quick answer
The Accudraft MX Semi Downdraft is the cost-positioned alternative to the full MX Downdraft, partial pit exhaust with side returns, a smaller intake-ceiling panel set, and a fitment family that's distinct from the full-downdraft MX. 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 MX Semi Downdraft shops choose filters
Intake side. The MX Semi Downdraft's ceiling plenum is smaller than the full-downdraft MX, with a reduced panel count matched to the booth's airflow. Polyester or fiberglass diffusion media fills the panels. We don't fabricate ceiling dimensions, the verified-fitment record draws from authorized-dealer cross-references and is confirmed by the nameplate plus a ceiling-panel photo. The AMU pre-filter on the semi-downdraft is typically a single-stage panel.
Exhaust side. The semi-downdraft airflow geometry uses a partial exhaust pit plus side-wall return media. The catalog default for the pit position is fiberglass arrestor pad; the side-wall returns typically take a paper-mesh or accordion-paper media depending on the original-equipment configuration. The 25-entry filter media taxonomy on this site distinguishes the 12 exhaust types, fiberglass-arrestor, polyester-arrestor, accordion-paper, paper-mesh, pocketed-paper, cube-overspray-arrestor, tower-exhaust-pocket-bag, plus 5 more, alongside 9 intake types and 4 specialty types. The MX Semi Downdraft's verified-fitment kit names the specific media-type slug per slot.
Slot expectations are queued for re-mapping. A note on transparency: the booth-model slot expectations row for the MX Semi Downdraft in our database is currently flagged in the 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. Smaller-shop MX Semi Downdraft installations typically run intake-ceiling at 45-60 days, AMU pre-filter at 75-100 days, exhaust pad at 90-120 days under typical low-to-moderate volume. The semi-downdraft airflow loads the exhaust pad differently than full-downdraft, particle distribution is less uniform, which the calibrated cycle accounts for.
Regulatory landscape
MX Semi Downdraft installations run under regional AQMD or state-DEP authority for VOC and HAP control plus federal OSHA spray-finishing standards (29 CFR 1910.94). Most semi-downdraft installations are in 6H Area Source category under NESHAP Subpart HHHHHH, which requires booth operation and maintenance per manufacturer specification with documented filter changes. The semi-downdraft's capture-efficiency rating is typically slightly below the full-downdraft equivalent, the OEM specification ships with each fitment kit so your compliance documentation matches the as-built configuration.
Who runs the MX Semi Downdraft
Two populations dominate the MX Semi Downdraft installed base. First, smaller independent collision shops where capital and slab-prep cost ruled out the full-downdraft MX, the semi-downdraft fits a tighter footprint and a tighter budget. Second, secondary-bay installations in larger shops where the primary booth is a full-downdraft and the semi-downdraft handles overflow, prep work, or smaller jobs.
MX Semi Downdraft filter FAQs
How do I confirm I have an MX Semi Downdraft versus a full MX Downdraft?
The exhaust pattern is the giveaway. Full MX Downdraft uses a pit running the full booth length with the entire booth floor as a grated exhaust surface. MX Semi Downdraft uses a partial pit (typically center-section only) plus side-wall return grilles. The nameplate confirms; the Filter Finder accepts a photo of the booth floor.
What's the source confidence on this fitment, and what does that mean for me?
**Distributor-cross-ref**, currently. That means the kit dimensions and slot count come from authorized-dealer parts cross-references in our authorized-dealer cross-reference import, high-confidence but not yet 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.
Does the semi-downdraft give me worse finish quality than a full downdraft?
In practice, on collision-class repaint work, the difference is small if the booth is properly maintained and the cycle stays current. The full-downdraft has a slight edge on uniformity for large panels and full-vehicle work; the semi-downdraft is fully adequate for most spot and panel repaints. Filter loading affects finish quality more than the airflow geometry difference does.
Can I upgrade my MX Semi Downdraft to a full downdraft?
Not without major slab and pit work, the full-downdraft requires a full-length pit and a different intake-ceiling configuration. Most shops considering an upgrade replace the booth entirely rather than retrofit. The MX Semi Downdraft has a solid working life on its original configuration.
My side-wall return grilles are getting clogged faster than the pit pad, why?
Particle distribution in semi-downdraft airflow concentrates more material at the side returns than at the pit center. This is normal. Subscriptions for the MX Semi Downdraft cycle the side-return media independently from the pit pad to account for the pattern.
Is the MX Semi Downdraft suitable for waterborne paint work?
Yes, with the polyester arrestor upgrade on the pit pad and a tighter cycle on the side-return media. Waterborne work loads the side returns faster than solvent-based work; the calibrated subscription cadence accounts for this when you specify waterborne at signup.
Sources
Primary references cited on this page.
- Accudraft, Paint Booth Manufacturerhttps://www.accudraftpaintbooths.com/
- Authorized-Dealer Parts Cross-Reference (authorized-dealer cross-reference)internal:distributor-cross-ref-2026-04
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