Heat And Moisture Exchange Filters（HMEF）

Product Overview

Heat and Moisture Exchange Filters (HMEFs) combine high-efficiency electrostatic bacterial and viral filtration with passive airway humidification in a single, lightweight device. Engineered for use in anesthesia circuits, mechanical ventilation systems, and respiratory therapy applications, each HMEF captures and returns heat and moisture from the patient’s exhaled breath while simultaneously blocking airborne pathogens from entering the breathing circuit.

By integrating two critical respiratory-care functions into one compact housing, Weishan Tech HMEFs eliminate the need for separate heated humidifiers and stand-alone breathing filters. This reduces circuit complexity, lowers consumable costs, and minimizes dead space — all without requiring external power or distilled water. The result is a streamlined, infection-conscious breathing circuit suitable for operating rooms, intensive care units, emergency departments, and field hospitals.

Core Technical Specifications

Parameter	Specification
Filtration Type	Electrostatic media with hygroscopic HME layer
Bacterial Filtration Efficiency (BFE)	≥ 99.999%
Viral Filtration Efficiency (VFE)	≥ 99.99%
Moisture Output (at VT 500 mL)	≥ 33 mg H₂O/L
Moisture Output (at VT 1000 mL)	≥ 30.8 mg H₂O/L
Temperature Output (at VT 1000 mL)	≥ 31°C
Tidal Volume Range	150–1500 mL (adult); 50–300 mL (pediatric)

Key Benefits for Medical Distributors

Dual-Function Design Reduces SKU Complexity

Each HMEF replaces two separate components — a breathing filter and an HME — allowing distributors to simplify inventory management, reduce warehouse space requirements, and offer a consolidated solution to procurement departments at hospitals and clinics.

Competitive Pricing with OEM/ODM Flexibility

Weishan Tech operates its own ISO 13485-certified manufacturing facility, enabling direct-from-factory pricing without intermediary markups. Custom branding, private-label packaging, and tailored product configurations (e.g., pediatric vs. adult models, with or without gas sampling port) are available for volume orders.

Proven Regulatory Compliance

All HMEFs carry CE marking and are manufactured under ISO 13485 quality management systems.

Frequently Asked Questions (FAQ)

Q: What is the difference between an HME and an HMEF?

A: An HME (Heat and Moisture Exchanger) provides passive humidification only, capturing warmth and moisture from exhaled breath and returning it during inhalation. An HMEF (Heat and Moisture Exchange Filter) adds an electrostatic or pleated filtration layer, combining humidification with bacterial and viral protection in a single device.