aht is a professional testing firm that specializes in on site field testing of H.E.P.A. filters. We perform the on site Dioctyl Phthalate (DOP) test to determine the filtering efficiency of H.E.P.A. filters, and to locate and repair any leaks or correct air flow problems. These tests are quite often required for Negative Air Machines and H.E.P.A. filter equipped vacuums used in environmental abatement projects such as the removal of asbestos, lead, mould, silica, etc.

In addition to our DOP testing services for Negative Pressure Units and HEPA Vacuums, we now offer airflow measurements of these units on site to assist the contractor's site supervisors in determining how much negative pressure is being achieved and the rate of air changes within the abatement site.

No longer do you have to estimate the airflow of your HEPA filtered equipment for project design. Now you can have airflow of your equipment accurately measured on site to assist you with achieving your project goals. All testing is performed with state of the art, calibrated, flow testing equipment, and after testing airflow measurements will be noted on our certification stickers, as well as being detailed in a comprehensive testing report. We can also furnish calibration certificates if required.