METHOD OF FILTERING AIR

• US 20140331859A1
• Filed: 05/09/2014
• Published: 11/13/2014
• Est. Priority Date: 05/09/2013
• Status: Active Grant

• Current Assignee: The Procter & Gamble Company
• Original Assignee: The Procter & Gamble Company
• Inventors: GRUENBACHER, Dana Paul, SCHROECK, Steven James, LEON, Jessica Elizabeth, DAL BO, Paolo, SCHOBER, Uwe
• Granted Patent: US 9,573,088 B2
• Time in Patent Office: Days
• US Class Current: 95/26
• CPC Class Codes: B01D 2273/30 Means for generating a circulation of a fluid in a filtration system, e.g. using a pump or a fan
• CPC Class Codes: B01D 46/02 Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
• CPC Class Codes: B01D 46/44 controlling filtration
• CPC Class Codes: F24F 1/0071 with means for purifying supplied air perfuming or deodorising means F24F1/008
• CPC Class Codes: F24F 13/28 Arrangement or mounting of filters
• CPC Class Codes: F24F 8/108 using dry filter elements
• CPC Class Codes: Y02A 50/20 Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

A method for filtering air of about 1 to about 10 microns particles at a greater than 40% filtering efficiency is provided. The method includes providing an air filtering device comprising a base, a fan functionally attached to the base, an air filter releasably attached to the base, and a substantially air impermeable outer sleeve; and activating the device for at least about 20 minutes.

Claims

1. A method of filtering air comprising the steps of:

a. providing an air filtering device in a room, wherein said device comprises

a base having an air inlet and an air outlet;

a fan functionally attached to said base, wherein said fan moves about 70 to about 150 CFM of air through said air outlet, at about 15 to about 25 Pa of pressure, when said fan is activated;

an air filter in air flow communication with said air outlet;

a substantially air impermeable outer sleeve comprising a first open end, a second open end, and an air flow path therebetween, wherein said outer sleeve is in air flow communication with said air outlet and is releasably attached to said base at said first open end, and wherein said outer sleeve envelops said air filter around its longitudinal axis;

wherein the exit velocity of a volume of air exiting said second open end of said outer sleeve is about 0.6 to about 2.6 m/s when said device is activated; and

b. activating said device for a period of at least about 20 minutes whereby greater than 40% of particulates of about 1 microns to about 10 microns are removed from the air in said room.

3. The method of claim 1 or 2 wherein said room is about 22 m³ to about 45 m³.

4. The method of claim 1 or 2, wherein said room is about 28 m³ to about 34 m³.

5. The method of claim 1 or 2, wherein said activating step removes greater than 70% of particulates of about 1 to about 10 microns are removed from the air in said room.

2. A method of filtering air comprising the steps of:

a. providing and air filtering device in a room, wherein said device comprises;

a base having an air inlet and an air outlet;

a fan functionally attached to said base, wherein said fan is capable of moving air through said air outlet;

an air filter bag in air flow communication with said air outlet and comprising an air flow surface area from which air exits said air filter bag when said device is in use;

a substantially air impermeable outer sleeve comprising a first open end, a second open end, and an air flow path therebetween, wherein said outer sleeve is in air flow communication with said air outlet, and wherein said outer sleeve envelops said air filter bag around its longitudinal axis and defines a spatial gap between said air filter bag and said outer sleeve;

wherein the air flow rate in said air flow path is about 70 to about 100 CFM and the pressure drop of said device bag is less than about 8 Pa; and

b. activating said device for a period of about 20 minutes, whereby greater than 40% of particulates of about 1 to about 10 microns are removed from the air in said room.