Level 1 work generally does not require an enclosure unless Infectious Control Procedures are necessary.

It is inclusive of a total of no more than 10 square feet of abated material. Personnel performing the abatement work wear a Tyvek suit, a Half Face respirator and hand and eye protection They lay drop sheets below the work area and have a HEPA vacuum present for the work. Once the material has been abated, they perform the necessary cleaning and remove the site controls.

Level 2 abatement work requires an enclosure.

Level 2 denotes that the materials to be removed are in between 10 and 100 square feet. It is generally accepted that the personnel performing the work should be wearing a Full Faced respirator, a Tyvek suit and hand protection. Depending on the size of the enclosure, either a HEPA vacuum or negative air machine must be present to provide negative air pressure. Once the material has been abated, the site personnel will perform a general cleaning and upon inspection, will take down the enclosure.

Level 3 abatement work always requires an enclosure, a two chambered decontamination area and negative air machines.

Level 3 denotes that the materials to be removed are in excess of 100 square feet. The personnel performing the work must wear a Full Faced respirator, hand protection and a Tyvek suit. Once the material has been removed, the personnel carry out a detailed cleaning of the area. It is also imperative that an environmental consultant perform an air quality test prior to the dismantling of the enclosure.