Introduction
Indoor air looks clean. It isn’t.
Every room holds dust particles, bacteria, PM2.5, pollen, and in some cases — virus-sized particles small enough to pass through a standard filter without slowing down. You can’t see them. But your lungs do catch them.
Delhi’s average PM2.5 level sits around 92 µg/m³ — nearly 18x the WHO safe limit. Inside homes, offices, and hospitals, the air can be just as bad or worse, depending on ventilation.
A HEPA filter is one of the few technologies proven to remove these particles reliably. Not reduce. Remove.
At Fiilters, we manufacture both HEPA H13 and HEPA H14 filters in Delhi — built to ISO 9001 certified, used by hospitals, pharmaceutical cleanrooms, IT offices, and home air purifiers across India.
This guide covers everything you need to know about both grades: how they work, what they filter, where each one belongs, and why buying direct from a Delhi manufacturer matters.
What Is a HEPA Filter?
HEPA stands for High-Efficiency Particulate Air.
A HEPA filter is a dense, pleated mat of fine glass fibres. Air passes through it. Particles do not — or most of them don’t, depending on the grade.
How it works — 4 mechanisms
1. Impaction Larger particles (above 1 micron) can’t follow airflow curves. They travel straight and hit a fibre. They stick.
2. Interception Mid-size particles follow the airflow but pass close enough to a fibre to get caught. No collision needed.
3. Diffusion Tiny particles (below 0.1 micron) move randomly — Brownian motion. This random path increases the chance of hitting a fibre.
4. Sieving Very large particles simply can’t fit through the gaps between fibres.
At 0.3 microns, particles are hardest to catch — small enough to escape impaction, large enough to avoid diffusion. This is called the Most Penetrating Particle Size (MPPS). HEPA ratings are always measured at this worst-case size.
EN 1822 Standard
The international standard for HEPA filters is EN 1822 standard, published by the European Committee for Standardization. It classifies filters from H10 to U17. In India, this is the benchmark used by pharmaceutical, hospital, and cleanroom procurement teams.
H13 and H14 are the two grades most commonly used in commercial and medical applications.
HEPA H13 Filter — Full Explanation
HEPA H13 filters 99.95% of particles at 0.3 microns.
That means for every 10,000 particles that enter the filter, at most 5 pass through. In practical terms — the air coming out is clean enough for hospitals, labs, and commercial buildings.
Particle size reference
| Particle | Size |
|---|---|
| PM2.5 | 2.5 microns |
| Bacteria | 0.5 – 5 microns |
| Pollen | 10 – 100 microns |
| Tobacco smoke | 0.01 – 1 micron |
| Virus (airborne) | 0.02 – 0.3 microns |
| Mold spores | 1 – 30 microns |
H13 handles all of these effectively — including the smaller virus-range particles, because even at 0.3 microns the 99.95% rating applies.
Where H13 works best
- Hospitals and clinics — wards, OPDs, general patient areas
- Corporate offices — HVAC systems in multi-floor buildings
- Schools and colleges — classrooms with 30–50 occupants
- Home air purifiers — room units rated 200–500 CADR
- Commercial kitchens — grease + PM2.5 combination environments
- IT server rooms — dust control for sensitive equipment
H13 is the right choice when you need clean air at scale, without the pressure drop or cost that comes with H14.
Browse our HEPA H13 filter range for available sizes, frame types, and bulk pricing.
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HEPA H14 Filter — Full Explanation
HEPA H14 filters 99.995% of particles at 0.3 microns.
That’s 10x better than H13. For every 100,000 particles entering the filter, at most 5 pass through.
The difference sounds small on paper. In a surgical OT or a pharma cleanroom — where airborne contamination can mean a failed batch or a post-op infection — that difference is significant.
Individual leak testing
Under EN 1822, H14 filters require individual leak testing — every single filter, not just batch samples. Each unit is tested using a particle counter and aerosol generator before it leaves the production line.
H13 filters use overall efficiency testing. H14 uses individual scan testing. This distinction matters when procurement teams review compliance documents.
Where H14 is required
- Pharmaceutical cleanrooms — ISO Class 5 and above
- ICU and operating theatres — surgical environments where bacteria count is regulated
- Semiconductor fabrication — particulate-free air for chip manufacturing
- Biotech and research labs — BSL-2 and BSL-3 containment areas
- Defense and aerospace — controlled-environment assembly lines
H14 isn’t for every building. It’s for environments where contamination has a direct cost — product failures, infection risks, regulatory non-compliance.
See our HEPA H14 filters — individually tested, ISO 9001 Certified Manufacturing | Quality Tested Before Dispatch
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H13 vs H14 — Comparison Table
| Parameter | HEPA H13 | HEPA H14 |
|---|---|---|
| Filtration efficiency (MPPS) | ≥ 99.95% | ≥ 99.995% |
| Leakage allowance | ≤ 0.05% | ≤ 0.005% |
| Test method (EN 1822) | Overall efficiency | Individual scan test |
| Pressure drop | Lower | Higher |
| Airflow resistance | Moderate | High |
| Cost | Moderate | Higher |
| Replacement cycle | 12–24 months | 12–18 months |
| Best environment | Offices, hospitals, homes | Pharma, OT, cleanrooms |
| Compliance requirement | General healthcare, LEED | GMP, ISO Class 5–7, NABH |
| Custom sizes available | Yes | Yes |
Which one should you choose?
If you’re setting up a commercial HVAC or hospital ward — H13 is the right grade. If your environment is regulated under GMP, ISO cleanroom standards, or surgical protocols — H14 is what the compliance auditor will ask for.
This section is the most searched question in the HEPA filter category in India. Both grades are manufactured at our Delhi facility.
Benefits of HEPA H13 Filter
H13 filters deliver measurable results across multiple environments.
Allergy and asthma relief. H13 removes pollen, dust mites, pet dander, and mold spores — the four most common indoor allergens. For asthma patients, clean air reduces trigger frequency.
PM2.5 removal. Delhi’s PM2.5 problem is well-documented. At 2.5 microns, these particles sit well within H13’s filtration range. A properly installed H13 system can reduce indoor PM2.5 by 80–95%.
Bacteria and virus control. Most airborne bacteria (0.5–5 microns) and many aerosolized virus particles are captured at H13 efficiency. Post-COVID, this has become a procurement requirement in many corporate offices.
Chemical-free filtration. No UV, no ionization, no ozone. H13 filters particles mechanically. The output is clean air — no byproducts.
Home and commercial use. H13 works in both standalone room purifiers and large AHU/HVAC systems. It’s the most widely used HEPA grade in India because it balances filtration efficiency with airflow and cost.
Benefits of HEPA H14 Filter
H14 is the standard where contamination control is a compliance requirement, not a preference.
Hospital-grade air quality. Operating theatres need air that meets specific CFU (colony-forming unit) counts per cubic metre. H14 is the filter grade that gets environments there. NABH-accredited hospitals routinely specify H14 for OT and ICU air handling units.
Pharmaceutical GMP compliance. Schedule M under India’s Drugs and Cosmetics Act requires cleanroom air to meet defined ISO classes. H14 is the filtration grade that supports ISO Class 5 (100 CFU/m³ or cleaner) environments. Without it, a GMP audit will flag the facility.
Individual-tested quality. Every H14 filter we manufacture is scan-tested before dispatch. You receive a test report with your order — not a batch certificate, a unit-level certificate.
Contamination prevention at scale. In semiconductor or biotech manufacturing, one contaminated batch can cost lakhs. H14 filters remove particles that H13 allows through. The cost of the filter is small relative to the cost of a failed production run.
Who Uses HEPA Filters in India?
Demand for HEPA filtration has grown significantly in the last 5 years — driven by AQI awareness, post-COVID ventilation upgrades, and pharma sector expansion.
Hospitals are the largest segment. From multi-specialty chains in Delhi NCR to district hospitals in Tier 2 cities, H13 and H14 filters are now part of standard AHU specifications.
Pharmaceutical companies buy H14 in volume — for manufacturing cleanrooms, QC labs, and packaging areas. GMP audits and FDA inspections make filter documentation non-negotiable.
IT offices in Gurugram, Noida, and Delhi have retrofitted existing HVAC systems with H13 filters following indoor air quality studies showing productivity links to PM2.5 exposure.
Schools in Delhi NCR — where outdoor AQI regularly crosses 200 — have started installing H13 units in classrooms after state-level guidelines on indoor air quality for children.
Home users buying room purifiers expect H13-grade filters as standard. Replacement filter demand from this segment has grown 3x since 2020.
Delhi’s AQI context: The city recorded 92 µg/m³ annual average PM2.5 in recent years — well above the national safe limit of 40 µg/m³. This drives both institutional and consumer demand for HEPA filtration year-round, not just during winter smog season.
Our Manufacturing Process
Every HEPA filter starts with the filter media.
Media sourcing. We use glass microfibre media that meets EN 1822 raw material specifications. Media is tested for uniformity, fibre diameter, and baseline efficiency before it enters production.
Pleating. The media is machine-pleated to increase surface area within a fixed frame size. More surface area means lower pressure drop for the same efficiency — which means less load on your blower or AHU motor.
Sealing. Pleated packs are sealed into aluminium, galvanized steel, or MDF frames using hot-melt or polyurethane sealant, depending on the application. Pharmaceutical units require PU sealant for chemical compatibility.
Leak testing.
- H13 filters: overall efficiency test using aerosol photometer
- H14 filters: individual scan test across the entire filter face, per EN 1822 Part 5
Documentation. Each filter ships with an efficiency test certificate. H14 filters include individual scan test reports with particle count data.
Compliance. Our facility operates under ISO 9001 quality management. Filter production follows EN 1822 methodology. We supply test documentation accepted by pharma auditors, hospital accreditation bodies, and cleanroom consultants.
Custom sizes are available across both grades — non-standard frame dimensions, special depth requirements, and OEM configurations for air purifier manufacturers. View our full filter range to see all product categories.
Why Buy HEPA Filter Direct from a Delhi Manufacturer?
Factory-direct pricing. No distributor margin. No importer markup. You pay the production cost plus our margin — that’s it. For bulk orders, pricing is negotiated directly with our production team.
Custom sizes. Standard catalogue sizes don’t fit every AHU. We manufacture to drawing — any frame material, any depth, any pleat count you specify. Turnaround for custom orders is 7–10 working days.
OEM supply. Air purifier brands, HVAC contractors, and hospital engineering teams source filters from us under their own branding. We handle production, testing, and labelling. You handle distribution.
Pan India delivery. We ship from Delhi to Mumbai, Bengaluru, Chennai, Hyderabad, Pune, and all Tier 2 cities. For bulk orders, we coordinate freight-forward logistics.
Technical support. Our team can review your AHU specifications and recommend the right filter grade, frame type, and replacement schedule. This is not a sales call — it’s an engineering conversation.
Frequently Asked Questions
What is the difference between H13 and H14 HEPA filter?
H13 filters 99.95% of particles at 0.3 microns. H14 filters 99.995%. H14 also requires individual scan testing per EN 1822, while H13 uses overall efficiency testing. H14 is the right grade for pharmaceutical cleanrooms, operating theatres, and ISO Class 5–7 environments. H13 covers hospitals, offices, and homes.
Which HEPA filter is best for hospitals in India?
General wards and OPDs: H13 is sufficient and cost-effective. Operating theatres and ICUs: H14 is required, and NABH accreditation documents typically specify it. If you’re unsure, share your AHU specs and we’ll confirm the right grade.
Can HEPA H13 filter remove PM2.5?
Yes. PM2.5 particles are 2.5 microns — well within H13’s filtration range. H13 removes 99.95% of particles at 0.3 microns (the hardest size to filter), so PM2.5 is captured at even higher efficiency.
Do you manufacture custom size HEPA filters?
Yes. We manufacture H13 and H14 filters in any frame size, depth, or material. Standard lead time for custom orders is 7–10 working days. Send us your drawing or AHU specification and we’ll quote.
What is EN 1822 standard?
EN 1822 is the European standard that classifies and tests high-efficiency air filters (HEPA and ULPA). It defines test methods, efficiency classifications (H10 to U17), and documentation requirements. It’s the standard used by pharma auditors, hospital accreditation bodies, and cleanroom consultants in India.
How often should HEPA filters be replaced?
H13: every 12–24 months depending on air quality and usage hours. H14: every 12–18 months, with individual retest recommended if pressure drop increases significantly. Pharmaceutical and hospital environments typically follow a fixed schedule regardless of visual condition.
Conclusion
HEPA H13 and H14 filters solve different problems. H13 gives you clean air for everyday commercial and healthcare environments. H14 gives you the filtration precision that regulated industries require.
Both are manufactured at our Delhi facility — pleated, sealed, tested, and documented to EN 1822 standards.
If you know what you need, contact us for a quote. If you’re unsure which grade fits your application, share your AHU specifications or room use case and our team will recommend the right filter.
- WhatsApp: 96255 55709
- Email: bafcustomercare@gmail.com
- Website: fiilters.com
- Factory: 197/3, Gali No. 3, Padam Nagar, Sarai Rohilla, Delhi, 110007, India
Fiilters is an ISO-certified air filter manufacturer based in Delhi, India. We manufacture HEPA H13, HEPA H14, bag filters, pre-filters, carbon filters, and custom filtration solutions for industrial, pharmaceutical, and commercial applications.