Media Taxonomy — Damn Filters

flowchart TD A["Media"] --> B["Standard — 3-ladder"] A --> C["Exotic — single media, no ladder"] A --> D["New — no DFI code"] B --> B1["80/20 · #12 Std · #18 FR"] B --> B2["NF Nano · #24 Std · #25 FR"] B --> B3["SB Spun Bond · #60 Std · #68 FR"] C --> C1["#15 carbon · #21 90/10 glass"] C --> C2["#40 Nomex · #41 Nomex-PTFE"] C --> C3["#62 aluminized · #64 teflon · #65 PTFE"] D --> D1["wide-pleat-nf · spunbond substrate · bands"] D --> D2["nf-on-sb · spunbond substrate · bands"] D --> D3["polyester-felt · cage"]

The DF media catalog (the #12–#68 media codes; #10 Cellulose retired). Folded from vt-note.md (2026-08-20). Canonical media derivation is src/media.py canonical_media() — Option1 Value drives the exotic and wide-pleat codes; the SKU suffix is still the fallback for standard media (Option1 NF/SB labels are NOT yet read — see docs/open-questions.md §2.1).

DF = 80/20

#10 Cellulose (standard paper) is removed from the taxonomy — only #12 80/20 is used in its place. Any "#10" reference is a legacy code, not a live media.

#12 — Blend-80/20% (Cellulose/Polyester), 8020 Std — 23 CFM @ 0.5wg Frazier (Airflow); at 1"wg 92% Dust Spot on 0.5 micron
#18 — Fire Retardant Blend-80/20% (Cellulose/Polyester), 8020 FR — 18 CFM @ 0.5wg Frazier (Airflow); at 1"wg 92% Dust Spot on 0.5 micron

DF = Nano

#24 — Nanoweb, Nano Std — 29 CFM Frazier (Airflow); MERV 15
#25 — Fire Retardant Nanoweb, Nano FR — 29 CFM Frazier (Airflow); MERV 15

DF = Spun Bond

#60 — Polyester-100% (Spun Bond), SBP Std — 28 CFM @ 0.5wg Frazier (Airflow); at 1"wg 60% Dust Spot on 0.5 micron
#68 — Fire Retardant Spun Bond-100% — 28 CFM @ 0.5wg Frazier (Airflow); at 1"wg 60% Dust Spot on 0.5 micron

DF = Exotics

#15 — Carbon Impregnated (Polyester Blend) — 32 CFM Frazier (Airflow); electrical conductivity for Anti-Static; Shot Blasting | Powder Coating
#16 — Farr's Nano FR media
#20 — Meltdown — 28 CFM @ 0.5mg Frazier (Airflow); MERV 16; Carbon Black | Abrasive Blasting | Powder Paint
#21 — 90% Polyester/10% Glass — 25 CFM Frazier (Airflow); 275°F; Grain Dust | Paper Dust | Polishing
#40 — Nomex — 20–40 CFM Frazier (Airflow); 375°F; Chemical Processing | Dryers | Bin Vents
#41 — Nomex PTFE — 4–8 CFM Frazier (Airflow); 375°F; High Burst Pressure 300 PSF
#62 — Aluminized Spun Bond — 25 CFM @ 0.5wg Frazier (Airflow); at 1"wg 60% Dust Spot on 0.5 micron; washable/reusable; anti-static; for high-carbon / explosive-possible processes (grinding, welding)
#64 — Teflon Coated Spun Bond — 28 CFM/sq.ft. @ 0.5wg Frazier (Airflow); 100% Polyester w/ Teflon coating (hydro/oleophobic); at 1"wg 99% Dust Spot on 0.5 micron; Weld Fume, Galvanized/Stainless Welding, Laser Cutting of Oily Parts, Plasma Cutting, Sugars, Wet/Sticky Applications
#65 — PTFE Spun Bond, PTFE SBP — 6–10 CFM @ 0.5wg, 99% Dust Spot on 0.3 micron; near-HEPA efficiencies, washable, top-of-line; NOT for use where hydrocarbons are present; Pharmaceuticals | Cosmetics

New media definitions (no DFI code)

Brand-agnostic codes added where no DFI media grade exists — named by substrate or construction rather than a DFI #-number, so they sit outside the #12–#68 scheme.

wide-pleat-nf — wide-pleat nanofiber ("Nanofiber on Spunbond Polyester" / "Wide Pleat Nanofiber*"). Spunbond substrate → bands construction. Isolated to its own class like an exotic, but not a pure exotic (the wide-pleat aspect is marketed).
nf-on-sb — "Nanofiber on Synthetic": nanofiber on a spunbond/polyester substrate. Spunbond substrate → bands construction. Drop-ship until quote volume justifies stocking.
polyester-felt — "Needled Polyester Felt" (Donaldson Ultra-Tek/Thermo-Tek/High Temp). Not spunbond → cage construction. No home in the standard model.