Negative air machines are used during cleaning/restoration projects to filter contaminated air, keeping pathogens and dust particles contained while work is being performed. Negative air pressure helps prevent the spread of contamination to other areas of a building. The industry standard is to change the air 6 times per hour. To create this negative pressure, more air has to leave the room than enters it. An air scrubber or negative air machine moves the contaminated air, filters it and exhausts it out of the work area, helping create this negative pressure. Go here
A HEPA air scrubber is a machine that moves the contaminated air and then filters it before expelling it out of a containment or ducting system. Negative air machines take this concept a step further by adding ducting, sealed casing, specific airflow modifications and blower motor speed variations to maintain a closed controlled area and achieve negative pressure inside the space. Typically, a prefilter is used to catch the larger particles, preventing them from making it through the HEPA filter. This extends the life of the more expensive HEPA filter, increasing efficiency.
Optimizing Air Quality: Using a Negative Air Machine Calculator for Effective Solutions
To calculate the number of air changes your negative air machine will produce, start by finding out your building’s volume in cubic feet. To do this, find out the square footage of the building and its interior height, then multiply the total volume by your negative air machine’s CFM (cubic feet per minute) rating. Divide this by 60, the number of minutes in an hour: 171.4 / CFM / 60 = 0.35. Now, you can calculate how many negative air machines you need to rent for your renovation project by dividing this amount by the building’s square footage: 0.35 / sqft = 5-6 units.