Twin air curtain system and method for using same

An air curtain system comprising:

• a first air stream;
• and
• a second air stream;
• wherein the first air stream is directed to flow in a first direction, wherein the second air stream is directed to flow in a second direction, and wherein the first direction and the second direction are substantially parallel;
• wherein the first air stream is configured to recirculate within an essentially closed loop system;
• and
• wherein the second air stream is configured to pull in air from atmosphere.

A system for testing a gas or vapor, the system comprising:

• a chamber configured to at least partially contain the gas or vapor, the chamber including an opening;
• and
• an air curtain system comprising:
• a first channel;
• a second channel adjacent and parallel to the first channel, the second channel including an inlet and an outlet;
• a first blower configured to direct airflow through the first channel;
• and
• a second blower configured to direct airflow through the second channel;
• wherein the first channel is configured to form an essentially closed loop such that the first blower recirculates air through the first channel;
• wherein the first channel has a first opening adjacent to the opening of the chamber, wherein the first channel has a second opening adjacent to the second channel, and wherein the second channel has an opening configured to open to atmosphere.