In modern commercial HVAC infrastructure, primary filtration serves as the first line of defense. The Pre Pleat 40 20x25x4 format represents a major evolution in air filtration technology. It transitions facilities away from shallow 1-inch or 2-inch panel filters towards deep-pleat geometries that dramatically optimize mechanical filtration efficiency and dust holding capacity (DHC).
A MERV 8 rating (under ASHRAE 52.2 standards) ensures the interception of particulate matter between 3.0 and 10.0 microns, including pollen, dust mites, and lint. By utilizing an extended surface area, the 4-inch deep configuration offers up to five times the media surface area of standard filters. This yields a lower initial pressure drop, reduces energy consumption in air handling units (AHUs), and extends the service life of expensive secondary HEPA filters downstream.
Compared to shallow alternatives, the 20x25x4 primary pre-filter reduces dynamic resistance. This allows variable-frequency drive (VFD) fan motors to run at lower speeds while maintaining target CFM volumetric flow rates. The result is a measurable reduction in operational expenditure (OpEx) and carbon footprint across commercial properties.
Procurement departments in multinational enterprises, hospital systems, and data center clusters face distinct challenges when sourcing air filtration solutions at scale. Supply chain resilience, cost-to-performance ratios, and adherence to international environmental compliance standards (such as ISO 16890 and ASHRAE 52.2) are critical indicators during vendor evaluations.
Purchasing managers look beyond the unit cost. They analyze filter lifespans, shipping volume optimization, and energy costs. The 20x25x4 filter minimizes replacements, lowering labor cost overheads.
Industrial applications require cleanroom verification and flame-retardant standard matching (UL 900 Class 1 or 2). Our production pathways guarantee that materials are safe and certified.
Global HVAC brands rely on OEM partners to manufacture high-capacity filters matching their specifications. This includes customized pleat counts, wire support grids, and frame branding.
Shenzhen Snow Peak Clean Technology Co., Ltd. is an integrated high-tech enterprise, specialized in air filtration products research and development, production, sales, import and export trade. We produce and supply: Pre-filter, pocket filter, HEPA filter, chemical filter; replacement HEPA filter, car cabin air filter, humidifier filter; pocket filter media, melt-blown composite filter media, and other high-performance filter materials; provide high quality air purification solutions and products for indoor air pollution control and air conditioning systems of civil and industrial buildings, microelectronics, pharmaceutical, laboratory, school, hospital clean room etc.
Combined with self-developed patented technology, our sterilizing antiviral HEPA filter can effectively filtrate fine particles, so that PM2.5 concentration down to 10 micrograms/m3, 5 times better than national standard; effectively inhibit the breeding of microorganisms, sterilization rate up to 99.9%, and no secondary pollution, removal of H1N1 virus efficiency as high as 99.99%.
Having 15 years of international air purification technology experience as the background, our company has standardized production workshop, dust-free filter workshop and first-class technology of HEPA filters production line and inspection line, independent research and development of fully automatic air filter production line, equipped with AMADA CNC punch and CNC bending machine as well as many other advanced high-end equipment, provide a strong guarantee for production and quality of air filtration and purification products.
By digitizing our supply chain and integrating robotic automation, we ensure that every OEM Pre Pleat 40 filter maintains consistent dimension control, uniform pleat spacing, and secure media-to-frame sealing. This keeps performance high and reduces structural failures under variable air volumes (VAV).
The architectural design of the Pre Pleat 40 air filter utilizes a synthetic media blend, hot-melt laminated to a corrosion-resistant galvanized wire mesh support. This construction prevents media sagging or warping under variable air currents. It is enclosed in a moisture-resistant, heavy-duty beverage board frame.
| Performance Parameters | Technical Value / Standard | Engineering Benefit |
|---|---|---|
| Nominal Dimensions | 20" x 25" x 4" (Actual: 19.5" x 24.5" x 3.75") | Standard fit for universal commercial AHU filter racks. |
| Filter Grade / Rating | MERV 8 (ASHRAE 52.2) / ISO Coarse 70% | Captures >70% of PM10 particles, extending HEPA lifetime. |
| Initial Resistance | 0.15 in. w.g. @ 300 FPM / 0.22 in. w.g. @ 500 FPM | Reduces energy consumption by decreasing static load. |
| Final Recommended Resistance | 1.0 in. w.g. (250 Pa) Max | Ensures replacement cycle scheduling based on delta-P. |
| Filter Media Composition | 100% Synthetic Hydrophobic Gradient Polyolefin | Resists microbial growth and maintains structure when wet. |
| Enclosure Frame Type | Wet-Strength Moisture-Resistant Cardboard/Beverage Board | Maintains stiffness under high humidity conditions. |
| Maximum Operating Temperature | 200°F (93°C) | Suitable for extreme industrial return-air systems. |
Depending on the local environment and air quality, the Pre Pleat 40 20x25x4 filter serves different operational needs:
In pharmaceutical cleanrooms and semiconductor fabrication plants, the 20x25x4 pre-filter is installed in the air intake handlers. It filters out large particulates, preventing premature clogging of secondary sub-micron HEPA and ULPA filters.
Large office complexes and data server facilities use deep pleat filters to handle high volumes of outdoor air circulation. This maintains Indoor Air Quality (IAQ) and protects sensitive server electronics from outdoor particulates and soot.
Hospital HVAC systems rely on pre-filtration to capture larger biological particles. Using Snow Peak's sterilizing antiviral technology downstream of the primary Pre Pleat 40 stages provides extra protection for patients.
The primary differences lie in the surface area, dust holding capacity (DHC), and lifetime. A 4-inch deep Pre Pleat 40 20x25x4 filter has approximately 4.5 to 5 times the filtration surface area of a 1-inch or 2-inch panel. This larger surface area means lower initial air resistance, a higher capacity to capture dust, and a service life of up to 6 months (compared to 1 to 2 months for shallow panels). This reduces maintenance cycles and disposal costs.
Yes. As an OEM manufacturer, Shenzhen Snow Peak Clean Technology Co., Ltd. can customize pleat density, frame material (beverage board, galvanized steel, aluminum, or plastic), and the wire grid backing. This allows us to adjust the filter to meet specific air volume and pressure requirements in customized HVAC equipment.
Under the ASHRAE 52.2 standard, a MERV 8 pre-filter is designed to capture 70% or more of particles in the 3.0 to 10.0-micron range (like pollen, mold spores, and large dust particles). While it is not designed to capture fine PM2.5 particles on its own, it plays a key role as a pre-filter by removing larger dust particles. This protects and extends the life of downstream high-efficiency filters (like MERV 13 to HEPA) that capture sub-micron particles.
To prevent air bypass, we hot-melt glue the entire edge of the filter pack directly to the inside of the frame. This continuous seal prevents air from bypassing the media. Additionally, our automated gluing and cutting machinery ensures precise dimensions, resulting in a tight fit within standard air handler filter racks.
Synthetic media is highly durable and does not shed fibers into the airstream. It is naturally hydrophobic, meaning it does not absorb moisture, which prevents mold and bacteria growth on the filter. It also resists damage during handling, shipping, and installation compared to fragile fiberglass media.
Snow Peak
