What is the filtration efficiency grade?

The efficiency grade is from low to HEPA 14 grade (MERV 19) according to EN779, EN1822 and ASHRAE.

What are the main applications for these filters?

They are suitable for residential, commercial, and industrial use, including air purifiers, HVAC, and medical appliances.

Blue Square HEPA Air Filter Replacement for Holmes Hapf30at Air Purifier Parts

Name: Blue Square HEPA Air Filter Replacement for Holmes Hapf30at Air Purifier Parts
Brand: Nanjing Blue Sky Filter Co., Ltd.
SKU: 868888785

Jiangsu, ChinaNanjing Blue Sky Filter Co., Ltd.

US$2.10-10.10

500 Pieces

Product profile

Customization

Available

Clapboard

without Clapboard

Efficiency

Customized

Model NO.

BS339

Filtration Grade

HEPA Filter

Type

Panel Filter

Type

Filter

Application

Household

Usage

Holmes Air Purifier Parts

Produt Type

Air Purifier HEPA Filter Replacement

Color

White and Blue (Customized)

Size

254X119X36mm

Applicable Models

for Holmes Cap531-U, Cap529-U, Hap240 and So on

Supplier

Nanjing Blue Sky Filter Co., Ltd.

Transport Package

Standard Export Carton

Specification

Trademark

Blue Sky

Origin

Nanjing, Jiangsu

HS Code

8421991000

Production Capacity

50000PCS/Year

Key features

HEPA Filtration Efficiency: Reduces common household dust, pollen, mites, and other particles effectively.

Customizable Design: Color, size, and packaging can be customized to meet specific client requirements.

Wide Compatibility: Compatible with Holmes models including CAP531-U, CAP529-U, HAP240, and more.

Professional Manufacturer: Produced by Nanjing Blue Sky Filter Co., Ltd. with ISO9001 and ISO14001 certification.

Durable Construction: Features a plastic frame, fiberglass media, and seal ring for long-lasting performance.

OEM/ODM Service: Supports full customization from samples or designs for residential and industrial use.

Company profile

Standardized quality controlFlexible CustomizationHigh Repeat Buyers ChoiceProduct Certification

Nanjing Blue Sky Filter Co., Ltd.

Jiangsu, China

CertifiedBusiness Type: Manufacturer/Factory & Trading Company CertifiedR&D Capacity: ODM Service Available & OEM Service Available CertifiedCustomization Options: Customization from Samples, Customization from Designs, etc. CertifiedExport Year: 15 Years CertifiedNearest Port: Shanghai Port, Ningbo PortAverage Response Time: ≤5.99h

AI-Powered supplier vetting

SummaryBlue Sky is explicitly identified as a professional technical supplier providing 3D software design and broad customization services for filtration products. Its engineering and sales teams support product design and development, while quality processes include two inspectors, documented finished-product inspection instructions, raw-material traceability, and quality assurance. It holds ISO9001:2015, ISO45001:2018, ISO14001, and RoHS-related certification capability. Production-related evidence shows gluing, paper folding, and assembly lines, plus in-stock capacity, but no valid manufacturing-capacity contract with associated subcontractors. The supplier lacks an available SDK, overseas agents or branches, overseas warehouses, and overseas showrooms. Lead times are stated as within 15 working days in both peak and off-season. Financial information is limited to year labels and does not substantiate financial strength. Customer-specific cases are not provided.

Supplier typeThe supplier is explicitly described as a professional technical supplier. Its company description identifies a qualified engineering team and integrated filtration-product design and development services, supporting classification as a technical product and solution supplier.

CertificationsThe supplier reports ISO9001:2015, ISO45001:2018, and ISO14001 certifications, together with RoHS product-certification capability. These stated certifications provide explicit evidence of recognized quality, occupational safety, environmental, and product-compliance systems.

R&D capabilityThe supplier provides 3D software design and develops new filtration products, with engineering resources and multiple customization modes. However, it explicitly has no available SDK, so the evidence supports product-design and development capability but not SDK-based innovation or integration capability.

Production capacityProduction evidence includes gluing, paper folding, and assembly lines, in-stock capacity, two quality inspectors, standardized finished-product inspection instructions, and quality assurance with raw-material traceability. Lead times are stated as within 15 working days in both peak and off-season. A limitation is that no valid manufacturing-capacity contract exists with associated subcontractors.

Customization capabilityThe supplier explicitly supports customization from samples, customization from designs, full customization, flexible customization, and minor customization. It also provides 3D software design services and product design and development, indicating broad stated customization coverage.