Mail processing system with a mail hazard screening machine

A mail hazard screening machine comprising:

• i) a mail processing system comprising:
• a mail singulator that singulates mail into a singulated mail piece said mail singulator comprising:
• a singulator belt;
• a loading conveyor for moving a plurality of mail pieces in a mail stack to said singulator belt, wherein said singulator belt moves said singulated mail piece from said mail stack on the loading conveyor;
• an optical panel that moves from a force of the mail stack on the loading conveyor;
• a proximity sensor to detect a position of said optical panel;
• a controller;
• wherein the controller monitors the position of the optical panel and controls a rate of speed of the loading conveyor to prevent compression of the singulated mail piece before said singulated mail piece is fed into the hazard screening machine;
• ii) a pair of compression rollers;
• iii) an enclosure configured around the compression rollers;
• iv) a sampling plenum extending from said enclosure for drawing enclosure air from the enclosure;
• v) a vacuum device coupled with the sampling plenum and configured to maintain a negative pressure in the enclosure by drawing enclosure air from the enclosure;
• vi) an analysis device configured to analyze the enclosure air and detect a hazard material;
• wherein the compression rollers compress the singulated mail piece to expel said hazard material from said singulated mail piece;
• and
• wherein the vacuum device draws air from the enclosure and delivers enclosure air to the analysis device for detection of said hazard material;
• vii) a clean air inlet coupled with the enclosure and configured to direct a flow of clean air into the enclosure.