Air filtration system and method

A method of providing filtered air to an enclosed space, comprising:

• providing, with a power source, electrical power to a first air feed pump;
• pulling, with the first air feed pump, air from an exterior environment and pushing, with the first air feed pump, pressurized air to the enclosed space;
• providing, with a first filter media positioned between the first air feed pump and the enclosed space, downstream of the first air feed pump, coarse filtration of the pressurized air pumped from the first air feed pump through the first filter media and removing, with the first filter media, particles that are larger than approximately 5 microns from the pressurized air;
• and
• providing, with a second filter media positioned between the first filter media and the enclosed space, downstream of the first filter media, fine filtration of the pressurized air pumped from the first filter media through the second filter media and removing, with the second filter media, particles that are between approximately 1 nanometer and approximately 20 nanometers in size from the pressurized air.

A system for providing filtered air to an enclosed space, comprising:

• a first air feed pump adapted to pull air from an exterior environment and push pressurized air through the system to the enclosed space;
• a first control valve positioned between the first air feed pump and the first filter media, downstream of the first air feed pump, the control valve being adapted to control the flow of pressurized air from the first air feed pump;
• a second air feed pump adapted to pull air from the enclosed space and push pressurized air through the system to the exterior environment;
• a second control valve positioned between the second air feed pump and the exterior environment, downstream of the second air feed pump, the second control valve being adapted to control the flow of pressurized air from the second air feed pump;
• a power source adapted to provide electrical power to the first and second air feed pumps;
• a first filter media positioned between the first air feed pump and the enclosed space, downstream of the first air feed pump, the first filter media adapted to provide coarse filtration of the pressurized air pumped from the first air feed pump through the first filter media and remove particles that are larger than approximately 5 microns from the pressurized air flowing through the first filter media;
• a second filter media positioned between the first filter media and the enclosed space, downstream of the first filter media, the second filter media adapted to provide fine filtration of the pressurized air pumped from the first filter media through the second filter media and remove particles that are between approximately 1 nanometer and approximately 20 nanometers in size from the pressurized air flowing through the second filter media;
• a third filter media positioned between the second air feed pump and the exterior environment, downstream of the second air feed pump, the third filter media adapted to provide fine filtration of the pressurized air pumped from the second air feed pump through the third filter media and remove particles that are between approximately 1 nanometer and approximately 20 nanometers in size from the pressurized air flowing through the third filter media;
• a fourth filter media positioned between the second air feed pump and the third filter media, downstream of the second air feed pump, the fourth filter media adapted to provide coarse filtration of the pressurized air pumped from the second air feed pump through the fourth filter media and remove particles that are larger than 5 microns from the pressurized air flowing through the fourth filter media before the pressurized air passes through the third filter media;
• a first reversing control valve positioned between the second filter media and the enclosed space;
• a reverse air flow path extending between and interconnecting the first control valve to the first reversing control valve;
• and
• a second reverse control valve positioned between the first control valve and the first filter media;
• wherein, the first control valve is selectively actuatable to divert pressurized air flow from the first air feed pump to the reverse air flow path, the first reversing control valve is selectively actuatable to stop air flow to the enclosed space and divert air flow from the reverse air flow path through the second filter media and the first filter media, and the second reverse control valve is selectively actuatable to divert pressurized air flow passing through the first filter media to the environment;
• and
• wherein, when pressurized air flows through the first and second filter media from the reverse air flow path, the pressurized air dislodges particles captured by the first and second filter media and expels particles dislodged from the first and second filter media out of the system to the exterior environment through the second reverse control valve.