High-Efficiency HVAC Reference Filter with Multi-Layer Nanofiber Composite Media

Topics Covered

Introduction to HVAC Reference Filter
Elmarco’s Reference Design
Design Parameters
     Nanofiber Coating
     Composite Media
     Final Filter
Properties of HVAC Reference Filter

Introduction to HVAC Reference Filter

HVAC reference filter from Elmarco is engineered to show the performance of novel nanofiber products and to corroborate concept feasibility in all crucial design and production steps. The reference filter with multi-layer nanofiber composite media offered by Elmarco delivers outstanding properties in the filter category.

Elmarco’s Reference Design

Elmarco’s reference design shows the way of using nanofibers within a composite structure to obtain optimum targets for capacity, pressure drop and efficiency in gradient air filtration. According to third party tests, the filter medium does not show any impact from discharge for ASHRAE 52.2J or EN779.

The nanofiber layer endures an IPA and KCL challenge and delivers mechanical filtration at pressure drop levels comparable to electrets type media. Commercially available materials are used in the fabrication of the reference filter using commonly used production processes. The MERV 15 / F9 reference product paves the way for filter manufacturers and media makers to achieve further improvement based on these results.

Design Parameters

The multilayer composite media concept provides designers several design levers to achieve optimized final filter design. To fulfill required performance, it is possible to optimize design levers in all three key production stages:

Nanofiber Coating

  • Polymer selection based on application conditions
  • Tuning of fiber diameter and basis weight to achieve performance targets
  • Optimization of solution and process to increase production throughput
  • Adhesion treatment optimization based on final properties
  • Fabricated using Elmarco’s needle-free Nanospider electrospinning technology

Composite Media

  • Material selection based on fiber properties, basis weight, pore structure, and stiffness
  • Selection and optimization of the lamination and bonding processes
  • Rapid prototyping of media to meet performance

Final Filter

  • Design parameters of self supported media
  • Media pleat design
  • Selection and optimization of the pleating process

Properties of HVAC Reference Filter

The properties of HVAC Reference Filter are listed in the following table:

Properties English Metric
Nominal face velocity 492fpm 10m/s
Initial pressure drop 0.33 in wg 82Pa
Efficiency rating per ASHRAE 52.2: 2007 MERV 15 at 1968cfm >95% F9
Efficiency rating per ASHRAE 52.2: 2007 App. J MERV 15A at 1968cfm >95% F9
Dust holding capacity 300g at 1.5 in wg 300g at 375Pa
Media area 172ft2 16 m2
Nominal dimensions (H x W x D) 24 x 24 x 12” 610 x 610 x 305mm
Filter type High efficiency mini-pleat V-bank filter High efficiency mini-pleat V-bank filter

Nanofiber composite media delivers greater dust holding capacity and superior mechanical filtration efficiency at lower pressure drop. Figure 1 shows dust holding capacity and initial resistance of Elmarco’s HVAC reference filter.

Figure 1. Outstanding Properties of Elmarco’s HVAC Reference Filter


Elmarco is the industry's first supplier of industrial scale nanofiber production equipment. Partnerships with global industrial leaders and universities form the foundation for success of the company. Elmarco's unique Nanospider™ technology is designed for ease of use, scalability, modularity and flexibility in producing the highest quality nanofibers.

Nanospider™ technology is a patented, needle-free high voltage, free liquid surface electrospinning process. The technology is based upon the discovery, that it is possible to create Taylor Cones and the subsequent flow of material not only from the tip of a capillary, but also from a thin film of a polymer solution.

The technology enabled Elmarco to build industrial scale production equipment with out nozzles, needles or spinnerets.

Nanospider™ technology allows the production of nanofibers from polymers solved in water, acids or bipolar solvents as well as from melted polymers and is suitable for the production of organic and inorganic fibers. This versatile technology is easily adapted to a variety of process parameters for the optimization of the specific properties of the produced nanofibers.

This information has been sourced, reviewed and adapted from materials provided by ELMARCO.

For more information on this source, please visit ELMARCO.

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