Air Purifier True HEPA Filter Cartridge

Product Overview

An air purifier filter (cartridge) is the replacement filter inside an air purifier that stacks a pre-filter, activated carbon and HEPA media together. Baisheng makes replacement filters to order for customers' air purifier models (OEM) — both cylindrical (for example φ200×φ144×290 mm) and flat composite types (for example 475×205×95 mm), HEPA grades H10–H14 — and can apply the customer's own brand label.

Features & Specifications

Type: cylindrical or flat composite, made to order for the customer's air purifier model (OEM) Sizes made so far: cylindrical φ200×φ144×290 mm, φ240/φ165×260 mm, φ350/φ171.5×255 mm; flat composite 475×205×95 mm Layers: pre-filter, activated carbon (or carbon non-woven), HEPA and an antimicrobial layer, combined to suit the model HEPA grade: H10–H14 (for example H12 melt-blown media; H10–H12 are called E10–E12 in the current EN 1822) Processing: about 88–109 pleats, glue on both faces, paper frame, self-adhesive foam, pull handle (depending on the model) Labeling: customer's own brand label available Airflow resistance and service life: provided per selection; CADR is a test value for the whole purifier, not a filter specification

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Detailed Description

An air purifier filter (cartridge) is the set of filter media inside an air purifier that actually cleans the air. It usually stacks a pre-filter that stops larger dust, activated carbon that adsorbs odors, and HEPA media that captures fine particles, built as a cylinder or a flat panel and replaced as a whole once it is dirty. What Baisheng makes is replacement filters made to order for the customer's air purifier model (OEM): we follow the size, layers and HEPA grade of the original filter, rather than selling one ready-made cartridge. We have made both cylindrical and flat composite types, in HEPA grades from H10 to H14, including models carrying the customer's own brand label.

We make both cylindrical and flat types

Yes — both are made to match the original filter. Examples we have made: - Cylindrical: φ200×φ144×290 mm (outer diameter × inner diameter × height, H12 melt-blown media + activated carbon), φ240/φ165×260 mm, φ350/φ171.5×255 mm - Flat composite: 475×205×95 mm, with the pre-filter, carbon non-woven, HEPA and antimicrobial layers stacked and pleated together Size, layers and grade are all set by the customer's model. When replacing filters for the same model, ordering to the specification of the original filter is the safest choice.

What layers are inside a cartridge?

A typical combination has three or four layers, each with its own job: the pre-filter takes the big stuff, the carbon takes odors, and the HEPA takes fine particles.

Layers in a composite air purifier filter

Cylindrical and flat types (made to the customer's model)

Schematic, not to scale. Number, order and thickness of layers and the HEPA grade depend on the customer's model; cylindrical filters usually have no antimicrobial layer.

- Pre-filter: stops hair, lint and larger dust, protecting the media behind it - Activated carbon (or carbon non-woven): adsorbs odors and some gases; it does little for particles - HEPA media: captures fine particles; the grade is chosen per model from H10–H14 — the cylindrical filter above, for example, uses H12 melt-blown media - Antimicrobial layer: added to flat composite filters at the customer's request HEPA and carbon can go into the same cartridge: a cylindrical filter combines both in one cylinder, while a flat filter stacks the layers and pleats them together. Each extra layer adds airflow resistance, so the number and thickness of layers must suit the space and fan of the original machine.

How is it made, and can it carry our brand?

Taking the flat composite type as an example, the process is roughly: - Pleating: the media is folded into about 88–109 pleats (depending on size) - Glue on both faces to hold the pleats in shape - Paper frame - Self-adhesive foam, which is compressed when the filter is installed so air cannot leak around the edges - Pull handle for easy removal and replacement We can apply the customer's own brand label: we have shipped models carrying a customer's English label, and some customers reorder the same composite filter on a regular basis.

True HEPA, HEPA-type, EN 1822 H classes: who defines each?

These terms all appear on air purifier filters, but they are not one system: only "HEPA" (US) and the EN 1822 H classes (Europe) have real definitions, while nobody governs "True HEPA" or "HEPA-type".

Term	Who defines it	How it is judged
HEPA	Defined by the US Department of Energy (DOE), adopted by the US EPA	Efficiency ≥ 99.97% on 0.3 μm particles
True HEPA	No regulation or certification body; a marketing term	No common test method; used to set a product apart from "HEPA-type"
HEPA-type / HEPA-like	No standard definition	No threshold; efficiency depends on the figure the maker states
EN 1822 H classes (H13, H14, etc.)	European standard EN 1822	Overall efficiency measured at the most penetrating particle size (MPPS), then classified

Note that since its 2009 revision, EN 1822 calls H10–H12 E10–E12 (EPA, efficient particulate air filters) and reserves the name HEPA for H13 and up. The air purifier trade and older specifications still often write H10–H12; this page keeps that usage, and it refers to the same classes. So when ordering replacement filters, rather than writing "True HEPA", state the grade you need, or the efficiency together with its test conditions, so both sides mean the same thing.

CADR and P4 / F4 are numbers for the whole purifier

They are not filter specifications. CADR (clean air delivery rate) and CCM (cumulative clean mass; P1–P4 for particles, F1–F4 for gaseous pollutants such as formaldehyde) are test metrics in China's national standard GB/T 18801 for the whole air purifier. The results depend on the fan, the air path and how well the housing seals, so the same filter gives different numbers in different machines. What can be specified for the filter itself is its size, layers, HEPA grade and materials. We make filters to the original machine's specification and do not label filters with CADR or CCM.

Frequently Asked Questions

Are the CADR, P4 and F4 figures on an air purifier filter the filter's own specifications?

No. CADR and the CCM grades (P1–P4 for particles, F1–F4 for gaseous pollutants such as formaldehyde) are test metrics in China's GB/T 18801 for the whole air purifier. They depend on the fan, air path and housing seal, so the same filter gives different numbers in different machines. What you can specify for the filter itself is size, layers, HEPA grade (we have made H10–H14) and materials.

Can you ship the filters under our own brand, with our label?

Yes. We have shipped air purifier filters carrying a customer's English brand label, and some customers regularly reorder the same composite filter. When you ask for a quote, tell us the label content, size and where it goes, together with the filter specification and quantity.

Can you make both cylindrical and flat filters? What information do you need?

We have made both. Cylindrical examples include φ200×φ144×290 mm and φ350/φ171.5×255 mm; a flat composite example is 475×205×95 mm. Please send the original filter (or photos with measured dimensions): outer diameter, inner diameter and height for a cylinder, or length, width and thickness for a flat filter, plus the layers, HEPA grade and quantity.

Can HEPA and activated carbon be combined in one filter?

Yes — this is the most common design for air purifier filters. A cylindrical filter can combine, for example, H12 melt-blown media and activated carbon in one cylinder; a flat filter stacks the pre-filter, carbon non-woven, HEPA and antimicrobial layer and pleats them together, as in our 475×205×95 mm model. More layers mean more airflow resistance, so the layers and thickness must suit the space and fan of the original machine.

We want to label our filter "True HEPA". Is there an official certification to apply for?

No. No regulation or certification body governs "True HEPA"; it is a marketing term makers use to set themselves apart from "HEPA-type". What is clearly defined is HEPA as set by the US Department of Energy (DOE): efficiency ≥ 99.97% on 0.3 μm particles. Europe also has the EN 1822 H classes, measured at MPPS with a different method. When ordering, we suggest stating the grade you need, or the efficiency together with its test conditions.