HVAC system air filter

• US 10,434,466 B2
• Filed: 12/18/2015
• Issued: 10/08/2019
• Est. Priority Date: 03/25/2015
• Status: Active Grant

• Current Assignee: K & N Engineering Incorporated
• Original Assignee: K & N Engineering Incorporated
• Inventors: Williams, Steve, Wall, Jere James
• Primary Examiner(s): Clemente, Robert
• Application Number:
  US14/974,092
• Publication Number:
  US 20160279562A1
• Time in Patent Office: 1,390 Days
• CPC Class Codes: B01D 2257/708 Volatile organic compounds V.O.C.'s
• CPC Class Codes: B01D 39/083 of organic material
• CPC Class Codes: B01D 41/04 of rigid self-supporting filtering material
• CPC Class Codes: B01D 46/79 by liquid process
• CPC Class Codes: B01D 53/0407 Constructional details of adsorbing systems
• CPC Class Codes: B01D 53/323 by electrostatic effects or by high-voltage electric fields
• CPC Class Codes: B03C 3/017 Combinations of electrostatic separation with other processes, not otherwise provided for
• CPC Class Codes: B03C 3/155 Filtration
• CPC Class Codes: B03C 3/41 Ionising-electrodes
• CPC Class Codes: B03C 3/47 flat, e.g. plates, discs, gratings
• CPC Class Codes: F24F 8/108 using dry filter elements
• CPC Class Codes: F24F 8/117 using wet filtering
• CPC Class Codes: F24F 8/125 using wet filter elements
• CPC Class Codes: F24F 8/192 by electrical means, e.g. by applying electrostatic fields or high voltages
• CPC Class Codes: F24F 8/20 by sterilisation
• CPC Class Codes: Y02A 50/20 Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

An apparatus and a method are provided for a heating, ventilation, and air conditioning (HVAC) system air filter for a building ventilation system. The HVAC system air filter comprises a supportive frame configured to orient the HVAC system air filter within the building ventilation system. A composite filter medium retained within the supportive frame comprises a cotton gauze portion and an electrostatic portion. The cotton gauze portion is configured for treatment with a filter oil composition to enhance airflow and filtration of air flowing through the composite filter medium. The electrostatic portion is configured to electrostatically attract and agglomerate airborne molecular contaminants and volatile organic compounds (VOCs) as small as 0.001 microns in diameter. In some embodiments, the composite filter medium comprises substances configured to release a fragrance into air passing through the composite filter medium.

Claims

1. A heating, ventilation, and air conditioning (HVAC) system air filter to remove airborne molecular contaminants and volatile organic compounds (VOCs) from air within building spaces, comprising:

a supportive frame comprising a shape and a size configured for orienting the HVAC system air filter within a HVAC system of a building; and

a filter medium retained within the supportive frame and configured to remove the airborne molecular contaminants and volatile organic compounds from air flowing through the HVAC system, wherein the filter medium comprises a cotton gauze portion comprising at least one layer of cotton gauze disposed between two epoxy-coated aluminum wire screens, the at least one layer of cotton gauze being configured for treatment with a filter oil composition to cause tackiness of microscopic fiber strands comprising the filter medium.

2. The HVAC system air filter of claim 1, wherein the filter oil composition comprises a first portion comprising paraffinic oil by volume of the composition, a second portion comprising polyalphaolefin (PAO) by volume of the composition, and a third portion comprising red dye by volume of the composition.

3. The HVAC system air filter of claim 1, wherein an electrostatic portion of the filter medium is configured to electrostatically attract and agglomerate particle contaminants within the air flowing through the HVAC system.

4. The HVAC system air filter of claim 3, wherein the electrostatic portion of the filter medium comprises a central screen configured to be electrically charged, the central screen being covered on each side by at least one layer of fibers capable of being electrically polarized, each of the at least one layer of fibers being covered by a grounded wire screen, wherein upon positively charging the central screen the at least one layer of fibers polarizes particle contaminants within the air flowing through the HVAC system, thereby causing the contaminants to be electrostatically entrapped within the at least one layer of fibers.

5. The HVAC system air filter of claim 3, wherein the electrostatic portion of the filter medium comprises at least some fibers that are treated with a coating of antimicrobial molecules configured to destroy microbes, the antimicrobial molecules comprising positively charged molecules distributed around the entire circumference of each of the at least some fibers and configured to cooperate with polarized fibers within the filter medium.

6. The HVAC system air filter of claim 5, wherein the positively charged molecules are configured to electrostatically capture negatively charged microbes and volatile organic compounds as small as substantially 0.001 microns in diameter within the air flowing through the HVAC system.

7. The HVAC system air filter of claim 3, wherein the filter medium is configured to electrostatically entrap particle contaminants and release a fragrance into the air flowing through the ventilation system, the filter medium comprising antimicrobial molecules configured to destroy entrapped particle contaminants, the filter medium comprising at least one substance configured to release the fragrance into air passing through the filter medium, wherein the at least one substance is located downstream of the antimicrobial molecules so as to avoid destruction of aromatic molecules by the antimicrobial molecules.

8. A heating, ventilation, and air conditioning (HVAC) system air filter for a building ventilation system, comprising:

a supportive frame configured to orient the HVAC system air filter within the building ventilation system; and

a composite filter medium comprising a cotton gauze portion and an electrostatic portion configured to electrostatically attract and agglomerate airborne molecular contaminants and volatile organic compounds (VOCs) within air flowing through the building ventilation system, the composite filter medium being retained within the supportive frame, wherein the supportive frame includes a plurality of ridges extending from the supportive frame, and wherein each of the plurality of ridges is shaped as a triangle having a flat top.

9. The HVAC system air filter of claim 8, wherein the electrostatic portion comprises a positively charged central screen, the central screen being covered on each side by at least one layer of polarized fibers, each of the at least one layer of polarized fibers being covered by a grounded wire screen, wherein the positively charged central screen and the at least one layer of fibers polarizes particle contaminants within the air flowing through the building ventilation system, thereby entrapping the particle contaminants within the at least one layer of polarizable fibers.

10. The HVAC system air filter of claim 9, wherein the electrostatic portion comprises at least some fibers that are treated with a coating of positively charged molecules configured to electrostatically capture and destroy negatively charged microbes and volatile organic compounds as small as substantially 0.001 microns in diameter within the air flowing through the building ventilation system.

11. The HVAC system air filter of claim 8, wherein the composite filter medium comprises at least one substance configured to release a fragrance into air passing through the composite filter medium, wherein the at least one substance is located downstream of the electrostatic portion so as to avoid destruction of aromatic molecules by the electrostatic portion.

12. The HVAC system air filter of claim 8, wherein the cotton gauze portion comprises at least one layer of cotton gauze configured for treatment with a filter oil composition to enhance airflow and filtration of air flowing through microscopic fiber strands comprising the composite filter medium.

13. The HVAC system air filter of claim 12, wherein the filter oil composition comprises a first portion comprising paraffinic oil by volume of the composition, a second portion comprising polyalphaolefin (PAO) by volume of the composition, and a third portion comprising red dye by volume of the composition.