Pocket count to spec
Matched to housing width & airflow
Pocket & Bag Filters for AHU & HVAC Systems
- G4-F9 Grades, Batch-Tested
- 200,000+ Pieces Monthly Output
- Low MOQ — From 200 pcs
Pocket and Bag Filters for AHU and HVAC Systems
In an AHU, the pocket filter usually sits behind a coarse pre-filter and does the F5–F9 work. We make non-woven and polyester bags from G4 to F9, plus rigid pockets for higher airflow and carbon pockets when odor is part of the spec.
Pocket count, depth and header follow the housing — standard or custom sizes, with batch test reports if you need them.
Pocket Filter Grades: EN 779, ISO 16890 & MERV
| Grade (EN 779) | ISO 16890 | MERV | Typical AHU stage |
|---|---|---|---|
| G4 | Coarse ≥60% | MERV 7–8 | Pre-filtration ahead of fine pocket stages |
| F5 | ePM10 50–60% | MERV 9–10 | First fine stage in compact AHUs |
| F6 | ePM10 60–80% | MERV 11–12 | Supply air stage in comfort HVAC |
| F7 | ePM1 50–65% | MERV 13 | Standard final stage in comfort AHUs |
| F8–F9 | ePM1 65–80% / ≥80% | MERV 14–15 | Final stage or protection ahead of HEPA |
Class cross-references are industry-accepted approximations (EN 779 / ISO 16890 / ASHRAE 52.2 MERV).
Custom Pocket Configurations & OEM Supply
Pocket count, depth, media and header follow the housing. Private-label OEM is also available.
Pocket depth options
Balance dust load & service life
Header frame materials
Aluminum, galvanized, stainless or ABS
Media grades G4-F9
Non-woven, polyester or fiberglass
Private label & branding
Your brand, our production
Packaging & container loading
Optimized for lower freight per unit
Scheduled Supply Program
Lock specifications and pricing once — we schedule production and container loading around your consumption, so your AHUs never wait for filters.
In-House Pocket and Bag Filter Production
Pocket filters are sewn and assembled in our own factory to the specified pocket count, depth and header. Each batch is checked before shipment.
Inside Our Factory →10,000 ㎡Smart factory, cleanroom production
200,000+Pieces / ㎡ monthly output
17+ yearsAir filtration manufacturing
3 daysFree samples · 7–10 day standard lead
Where Our Pocket & Bag Filters Work
Commercial HVAC Filtration
Offices, malls and hotels running AHU banks around the clock — F5-F9 pockets carry the fine stage at low pressure drop and long service intervals.
Food & Beverage Processing Filtration
Dust-heavy processing and packaging halls where filter bags support food-safety compliance — like the polyester bags supplied to a large-scale food plant.
Public Transit Filtration
Metro stations, airports and rolling stock ventilation running 24/7 — long-life pockets with low pressure drop and DIN 5510 fire-rated options.
Production Process
From raw material selection to packaging and shipment, with quality checks at each stage.
Raw Material Selection
Fiber Processing & Blending
Nonwoven Formation & Lamination
Cutting & Shaping
Quality Inspection & Testing
Packaging & Shipment
FAQs
What does a bag filter do in an HVAC system?
It carries the fine filtration stage. In a typical air handling unit a coarse panel pre-filter catches large dust, then the pocket or bag filter — usually F5 to F9 — removes fine particles before air reaches coils, ducts or a final HEPA stage. Multiple deep pockets give it several times the media area of a flat filter, so it holds more dust at lower pressure drop and runs longer between changes.
Pocket filter or bag filter — is there a difference?
No — they are the same construction under two names: a header frame with sewn media pockets, and both terms are used interchangeably across markets. Specify the grade (G4-F9), face dimensions, pocket depth and pocket count, and you'll get a like-for-like quote whichever term you use.
What micron size does an AHU bag filter capture?
Bag filters aren't rated by a single micron cut-off — efficiency is graded against particle-size fractions. Under ISO 16890 an F5 pocket captures 50–60% of ePM10 (particles up to 10 µm), while F7-F9 pockets capture 50% to over 80% of ePM1 (up to 1 µm). Match the grade to the downstream air quality your specification calls for.
Do you make fiberglass and synthetic pocket filters?
Yes. Pocket media options cover non-woven synthetic, polyester and fiberglass, plus activated carbon media for odor and VOC duty. Polyester bags are a frequent choice where hygiene matters — a large-scale food factory runs our polyester fiber filter bags for their low resistance and high dust-holding capacity.
What is your MOQ and lead time for pocket filters?
MOQ from 200 pieces. Free samples ship in 3 days; standard orders in 7–10 working days; bulk or custom orders in 15–20 days, with a green channel for urgent replacements.
Can you build custom pocket counts, depths or header frames?
Yes — pocket count, pocket depth, face size, media grade and header frame (aluminum, galvanized, stainless or ABS) are all production variables, with private label packaging if required. When Midea's filters clogged too fast, our engineers re-tuned the media pore density to raise dust-holding capacity and cut resistance — the same development support is available for OEM programs.
