To begin the process of certification, we go to the individual Air Handlers and traverse the unit for airflow on both the supply and return in order to calculate the outside(fresh) air percentage.

The next step is to measure the room size to get the area in cubic feet which we use to calculate fresh air changes for hour.

Readings are taken with a Flow Hood of both the supply and exhaust. Readings are also taken in the Ante room, if applicable. Using these readings we calculate fresh air changes and total air changes per hour for the room.

Then we take a pressure relationship using an electronic manometer between the Patient room and the Ante room, and between the Ante room and the corridor. At this time adjustments to air flows are made as needed to get the room to a point that meets State Regulations.

Space Pressurization Measurements and Adjustments

To set up the space pressurization requirements to meet the engineering design, it is imperative to start at the lowest differential area.

You must remember to always measure the pressure with reference to the outside air pressure of the project.

After the initial area is set, the test and balance engineer moves to the next higher pressure requirements. Again reference to the outside air pressure.

Verify there is enough supply air volume and pressure before again moving to a higher differential requirement. To achieve the higher differential to meet the design requirements, the return or exhaust must be reduced and the tightness of the area reviewed.

As the requirements for higher differentials are to be met, the rooms must be tested and reviewed for air tightness. If the higher pressure differentials cannot be met, the rooms must be tested with Air Doors and/or smoke candles and/or infrared cameras and the leaks sealed in order to meet the design criteria. Inspection of electrical and mechanical penetrations must be sealed with caulk.