Method and apparatus for ensuring air quality in a building, including method and apparatus for controlling a working device using a handheld unit having scanning, networking, display and input capability

A method for withdrawing air from a room, purifying the withdrawn air, and then returning the purified air back into the room, the method comprising:

• providing an air filtration unit comprising:
• a housing configured to be mounted to a surface of the room;
• an air inlet formed in the housing;
• an air outlet formed in the housing;
• a passageway extending through said housing and connecting the air inlet to the air outlet;
• a filter disposed in the passageway for purifying the air in the passageway;
• a suction fan disposed within said passageway for drawing air from the room into the air inlet through the filter and out of the air outlet to the room;
• and
• at least one of (i) a first sensor for monitoring proper function of at least one of the fan and the filter, and (ii) a second sensor for monitoring the ambient air of the room;
• and
• operating the air filtration unit so as to (i) withdraw air from the room, (ii) purify the withdrawn air by capturing at least one substance to the filter, and (iii) return the purified air to the room.