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Contact What This Filter Is and Who It Is For This is a cylindrical humidifier filter made by Oltaven for water spray (cold evaporation) humidifiers, combining highly absorbent humidifier paper or…
FILTER MEDIA / ROLLS · SHEETS · DIE-CUT
This is a cylindrical humidifier filter made by Oltaven for water spray (cold evaporation) humidifiers, combining highly absorbent humidifier paper or polymer humidifier fiber with a densely pleated honeycomb structure. It draws water up by capillary action, releases it as vapour into the air stream, and intercepts calcium and magnesium ions in the water to reduce white powder. It is aimed at appliance brands and equipment builders that need a finished, dimensionally customised humidification core for household or commercial machines.
A humidifier filter starts as a sheet of absorbent material, but the sheet alone does not humidify a room. What the user experiences — how much moisture reaches the air, how hard the fan has to work, how long the core lasts before it sags or smells — is decided after the media is chosen. Oltaven sells the finished cylinder, not the roll: the material is pleated, formed into a honeycomb cylinder, given its structural support and, where specified, an anti-microbial coating, then trimmed to the customer's drawing.
The pleating step matters more than it appears. Folding the media into dense pleats packs a large evaporation surface into a small cylinder, so a compact core can present far more wetted area to the airflow than its outer diameter suggests. That is the same trade-off found in any pleated filter: more surface means more capacity at a given resistance, provided the pleats are held open and the material keeps its shape when wet.
Forming and sealing then decide whether that surface stays usable. A water spray filter sits in a water trough for months. If the cylinder loses stiffness when saturated, pleats collapse, channels close and the effective area shrinks. Oltaven's construction is specified for high wet stiffness, so the pleated honeycomb holds its geometry during long immersion instead of softening, collapsing or coming apart.
The base material — humidifier paper or polymer humidifier fiber — controls how quickly water climbs through the pleats and how readily it evaporates. Strong capillary uptake gives fast wicking and vigorous evaporation; a weaker sheet wets slowly and leaves dry zones that contribute nothing. Media choice also affects how the core handles the minerals in tap water.
Pleat count, pleat depth and cylinder diameter together determine the evaporation area and the resistance the fan meets. More, deeper pleats raise area and capacity; packed too tightly, they raise resistance. Because Oltaven cuts pleat count, outer diameter, inner diameter and height to the drawing, these variables are set for the appliance rather than inherited from a stock size.
Wet stiffness keeps the structure open; anti-microbial and anti-mould treatment addresses the smell that develops when a wet core stands in a tank. The filter is also specified to intercept calcium and magnesium ions, limiting the white dust associated with hard water, and to reduce odour from the water tank. Together these determine how long the finished part performs at its rated level.
In each case the same principle applies: the cylinder must wet fast, hold its shape and stay clean over a long immersion period. Different appliances simply impose different diameters, heights and pleat counts.
| Item | Detail |
|---|---|
| Product name | Cylindrical humidifier filter / air purifier humidification core |
| Core humidification material | Highly absorbent humidifier paper or polymer humidifier fiber |
| Core performance | Strong capillary water uptake and rapid water molecule evaporation; intercepts calcium and magnesium ions in water (limits white powder); long-lasting anti-microbial and anti-mould action; reduces water tank odour |
| Physical structure | Dense pleated honeycomb construction for a large evaporation area; high wet stiffness — does not collapse or come apart during long immersion in the water trough |
| Typical end applications | Household cold-evaporation no-mist humidifiers; high-end air purifiers with humidification; industrial constant-temperature and constant-humidity equipment |
| Size and specification customisation | 100% OEM flexible custom manufacturing: outer diameter, inner diameter, height and pleat count of the cylinder, and whether an anti-mould/anti-microbial coating is composited, all manufactured precisely to drawing requirements |
| Quality and certification | Manufactured in a 50,000 m² modern clean plant; ISO 9001/14001 and IATF 16949 quality management systems; national-level CNAS testing laboratory for quality control |
Oltaven's business is OEM/ODM filter development. Over more than 20 years we have accumulated more than 1,000 developed filtration solutions, and custom humidifier cores are built on that base rather than started from scratch each time.
Production runs in a 50,000 m² plant in Zhongshan, Guangdong, China, which includes six cleanrooms totalling 20,000 m². A CNAS-accredited laboratory lets us issue test reports on filtration efficiency, dust holding capacity and resistance. The company holds IATF 16949 (obtained in 2024) together with ISO 9001, ISO 14001 and ISO 45001 system certification, and products meet REACH and RoHS requirements with compliance documents available. Quality control covers IQC, IPQC and OQC across the process, and multiple automated lines support monthly output in the millions of pieces.
To quote accurately we need the device or vehicle model, the size or a drawing, the airflow or water flow involved, the operating conditions and the quantity. Send these through our contact page and our team will respond with a proposal for your humidifier core.
Outer dimensions do not fix resistance. Pleat count, pleat depth and how open the pleats stay when wet determine the free area air passes through. A densely pleated cylinder with high wet stiffness keeps its channels open, so resistance stays closer to design; a core that softens in water closes those channels and resistance rises. Oltaven sets pleat count and material to the drawing so resistance is matched to the appliance.
Pleating packs a large evaporation surface into a small cylinder, so more wetted area meets the airflow than the outer diameter suggests. Combined with strong capillary uptake in the humidifier paper or polymer fiber, water spreads across the surface and evaporates readily. The result is fast wicking with an evaporation area sized to the appliance.
Yes. Oltaven supports 100% OEM custom manufacturing of the cylinder's outer diameter, inner diameter, height and pleat count, and the filter can be supplied with or without a composited anti-mould and anti-microbial coating. Parts are made precisely to drawing requirements, with logo and packaging customisation available through the same OEM/ODM programme.
The core is specified to intercept calcium and magnesium ions in the water, which limits the white powder associated with hard water. It also carries long-lasting anti-microbial and anti-mould action and reduces water tank odour. Actual results depend on local water quality and how the humidifier is used and maintained.
It starts with your device model and the size or drawing, plus airflow or water flow, operating conditions and quantity. From there we confirm the material and coating, produce samples for validation, and agree the drawing, logo and packaging before volume production. Requests can be sent through our <a href="/en/contact">contact page</a>.
MOQ and lead time depend on the specification and are confirmed with the quotation for this humidifier core, so please include your quantity when you enquire. We will state the applicable MOQ, sampling arrangement and production schedule for your drawing before the order is placed.
Replacement depends on water quality and how often the humidifier runs, because mineral loading and wet-dry cycles vary by household or site. The filter is built with high wet stiffness so it holds shape during long immersion, but scale build-up and odour are the practical signals to replace. Confirm the schedule for your model with our team.
Send the device model, size or drawing, airflow or water flow, operating conditions and quantity to our team through the <a href="/en/contact">contact page</a>. We will confirm the sample and quotation route for your specification, and the CNAS laboratory can report on agreed performance points to support your validation.