Updated September 2026.
Open any air purifier box in Delhi today and you'll see the same word on almost every one: HEPA. Most now add a letter and a number next to it: H13 vs H14. It doesn't settle the matter on its own. The two grades come from a real European test standard, they aren't marketing filler, but the H13 vs H14 gap is smaller than the price gap between the machines that carry them, and it isn't the letter that decides whether a room actually clears.
This is the H13 vs H14 question stripped down: what the letters mean, where the numbers come from, when paying for the jump is worth it, and when it's just a bigger sticker on the same box.
What does H13 HEPA actually mean?
H13 is a European filter class that must stop at least 99.95% of the hardest particle size to catch, tested to the standard EN 1822. That standard doesn't test at a convenient round number. It tests at the most penetrating particle size, or MPPS, the exact size a filter is worst at catching, somewhere around 0.1 to 0.2 microns depending on the filter medium (Camfil, Wikipedia's HEPA summary of the standard). A filter that passes at MPPS has already passed at every larger particle size that matters indoors, dust, pollen, most bacteria, the coarse end of smoke.
H13 is also the grade that shows up on almost every mid range home air purifier sold in India now, including most of what we stock. It isn't a downgrade from something better as standard. It's the entry point into true HEPA performance, and for a home it covers the great majority of what's actually floating around a Delhi flat.
What does H14 HEPA mean, and how much better is it than H13?
H14 must stop at least 99.995% of the same hardest particle size, under the same EN 1822 test. Written as a fraction that's easier to picture: H13 lets through at most 5 particles out of every 10,000 tested at MPPS. H14 lets through at most half of one. That's a real, verified tenfold cut in the leak rate, not a rounding difference (Camfil).
A tenfold cut sounds decisive until you put it next to what's actually in a Delhi living room in November, which is closer to a flood than a leak. Both grades are already stopping more than 99.9 percent of what hits them. The difference matters most where the air starts near-sterile and has to stay that way, an operating theatre, a cleanroom, a pharmaceutical line. It matters far less in a room where the front door opens onto a dusty corridor every twenty minutes.
Is the "true HEPA, 99.97%" on some boxes the same test as H13 or H14?
No, and mixing the two is the single most common confusion in this category. The 99.97% figure comes from a separate American standard, the US Department of Energy definition, which tests at a fixed particle size of 0.3 microns. EN 1822, the standard behind H13 and H14, tests at whatever the MPPS turns out to be for that specific filter, generally smaller than 0.3 microns and harder to catch (Wikipedia's HEPA summary of the standard, C-Air Filtration's H13 spec sheet). So a filter honestly rated H13 under EN 1822 has, if anything, been tested at a tougher point than a filter that only carries the American 99.97% claim. Neither number is fake. They're just answers to two different exam questions, and a box that quotes one without saying which standard it used isn't telling you enough to compare it against a competitor's box.
Does an H14 air purifier actually clean a Delhi room faster than an H13 one?
No. Clean Air Delivery Rate, not the filter's letter grade, decides how fast a room clears. CADR measures the volume of clean air a machine pushes out per hour. A well sized H13 machine with a strong CADR will clear a smoky room faster than a weak H14 machine, every time, because speed is a fan and airflow question, not a filtration-percentage one. We've written the full room sizing maths, with the formula and worked examples for Delhi flats, in our guide to the best air purifier for Delhi pollution. Read that first if you haven't sized a room yet. The filter grade only decides what fraction of the air that passes through gets caught. It says nothing about how much air passes through in the first place.
Does an H14 filter cost more to run than an H13 one?
Usually yes, because the denser media that gets H14 its extra leak protection also resists airflow more. A fan has to work harder to push the same volume of air through a tighter mesh. That's not a guess about our stock, it's the reason filter manufacturers market low resistance HEPA products as a selling point in their own right, Camfil's own commercial range includes a line built specifically to claw back the airflow that denser H14 style media otherwise costs (Camfil's low resistance HEPA filter line). In a home purifier that usually shows up as a slightly louder machine at the same airflow, or a pre filter that clogs sooner in Delhi's dust load and needs a rinse more often through the bad months. It's a real cost, just a small and manageable one, not a reason to avoid H14 where you actually need it.
Who actually needs H14 instead of H13?
A small group with a specific reason, not most households. H14 earns its keep for someone recovering from lung surgery, an infant with a serious respiratory condition, a family member on immunosuppressants, or a home doing renovation work that's kicking up construction dust and paint fumes on top of the usual Delhi load. For a normal household managing a normal Delhi winter, an H13 unit sized correctly for the room, and actually run for the hours it needs to run, gets closer to clean air than an undersized H14 unit ever will. If you're shopping for a bedroom or living room and nobody in the house has one of those specific conditions, put the H13 vs H14 question second, and put room size and CADR first.
Does India certify air purifiers the way Europe does with H13 and H14?
India has its own standard, but it doesn't require the EN 1822 letter grade at all. The Bureau of Indian Standards publishes IS 17531:2021, the specification for portable electric indoor air purifiers sold here, and it covers CADR test methodology, safety and ozone emission limits (IS 17531:2021, Bureau of Indian Standards). A machine can meet that Indian standard without ever printing "H13" or "H14" anywhere on the box, which is exactly why so many Indian listings lean on softer marketing phrases like "true HEPA" or "medical grade" instead of a number you could actually check. When a listing does print H13 or H14, that's a manufacturer choosing to be tested against the harder European bar voluntarily, and it's worth treating as a point in the product's favour.
Which H13 or H14 air purifier should I buy?
All four of these are H13 or H14 HEPA, in stock, and sized differently, so pick by room rather than by brand. Prices move through the year, so these are the bands each one sits in rather than a figure that'll be stale by the next update.
Honeywell Air Touch V2, under Rs 10,000
H13 HEPA, a 250 m³/h CADR and a real time PM2.5 display, quiet enough at its low setting for a bedroom overnight. The straightforward starting point if you just need one room covered before winter.
Honeywell Air Touch P2, mid Rs teens
Steps up to 550 m³/h CADR with an added UV LED stage, Wi-Fi and app control. The drawing room answer for a flat where the front door opens onto the rest of the house all evening.
Honeywell Air Touch U2, under Rs 30,000
650 m³/h CADR, still H13, built for an open plan living and dining floor rather than one bedroom. The ionizer and UV LED stages are extras layered on top of the HEPA and carbon filtration doing the actual work, treat them as a bonus rather than the reason to buy.
Sharp DW-J20FM-W, mid Rs 30,000s
Our H14 pick, and the one case where we'd actively point a shopper toward the higher grade. It combines H14 HEPA filtration with 20 litres a day of dehumidification on one plug point, built for a ground floor or basement room that turns damp in the monsoon and filthy in November, the two problems that tend to arrive together in older Delhi construction. If your reason for wanting H14 is a health condition rather than a damp room, ask us for the plain H14 options we can special order, since this specific unit's second job is moisture control.
Three ways people get the HEPA grade wrong
- Paying up for H14 without a reason to. Unless someone in the house has a specific medical reason or you're clearing renovation dust, that budget is better spent on a bigger CADR in H13.
- Trusting the word HEPA alone. A box that says HEPA without a letter grade or a standard hasn't told you anything you can check. Ask which standard and which class before you compare two products on filtration.
- Assuming the higher letter always wins the H13 vs H14 comparison. An undersized H14 machine loses to a correctly sized H13 machine in a real room, because CADR and room size decide speed, and the grade only decides what fraction of that air gets caught.
Where can I buy a HEPA air purifier online in Delhi NCR?
You can buy an air purifier online from us with delivery across Delhi NCR, or bring your room dimensions into the showroom and we'll work out CADR and filter grade with you on the spot. We've sold both sides of the H13 vs H14 argument into this city long enough to know which one actually gets asked for again the following winter, and it's rarely the more expensive letter.