Portable air filter device and method

A method of filtering an air exiting a vent, comprising:

• contacting a surface surrounding a vent with an attachment surface of at least one portable air filter, wherein the portable air filter comprises a frame, the attachment surface, and a planar filter, wherein the planar filter is flush with a rear side of the frame;
• adhering the attachment surface to the surface surrounding the vent such that the at least one portable air filter eclipses the vent;
• and
• wherein the at least one portable air filter is configured to reduce a concentration of contaminants in the air.

An air filtration device comprising;

• a frame, at least one planar air filter disposed within a rear interior perimeter of the frame, and an attachment material disposed on an exterior surface of the frame;
• the attachment material configured to removably adhere the frame to a surface surrounding a ventilation outlet;
• the frame sized and shaped to surround and receive an entirety of the ventilation outlet, whereupon the frame being secured to the surface surrounding the ventilation outlet;
• wherein the planar air filter is flush against the ventilation outlet;
• and
• wherein the planar filter is flush with a rear side of the frame.