![]() ![]() Example #1: Remediation in a 18′ x 26′ x 14′ warehouseįor this example we will calculate the number of air scrubbers required for a remediation job. Let’s put it all together with a clear example. We got started by saying this was simple, but there’s a lot of math going on up there. This will tell us how many air scrubbers we need for the job.Ĭalculating the Number of Air Scrubbers for a Job by Hand Finally, we will divide the desired number of air changes per hour by the rate at which one of our scrubbers changes the air.To do so, we divide 60 minutes by the time it takes to change the air once (from step 2). Now that we know how long it takes for the air scrubber to change the air once, we will use that to determine how many times the air will be changed each hour of operation.To do so, we will divide the room’s cubic feet from step 1 by the CFM of one air scrubber. Next we will calculate how long our air scrubber takes to change the air one time.It is the length multiplied by the width multiplied by the ceiling height. The equation for that calculation is above. We will first calculate the size of the room in cubic feet.To arrive at the number of air scrubbers needed for a remediation, restoration or other job, use the following steps: Make sure your calculations use cubic feet or any air scrubber calculations will be off dramatically! Sample Calculations Tip: Cubic feet and square feet are very different numbers. This calculation tells us the cubic footage of the room. When calculating the height, you need only account for the height to the ceiling. For each room in a home or building, multiply the room length, width and height. In addition to knowing how many air changes are desired, we’ll need to know the size of the area being cleaned. Size of the Building, Room or House in Cubic Feet An industry standard is six air changes per hour, but there are several factors that could warrant increasing or decreasing that number. Some say, even for mold remediation, four air changes per hour is adequate. ACH, ACPH, or APH (Air Changes per Hour)Ī key aspect in remediation and restoration is understanding how many air changes per hour are required to adequately clean the air. It is also a standard way of classifying the efficiency or duty cycle of an air scrubber or negative air machine. Air Scrubber CFM (Cubic Feet per Minute)ĬFM stands for cubic feet per minute. Negative air pressure is key to containing dirt, dust, fumes, fungus, mold, smoke and other particles from the environment. That’s the job you’ll rely on the air scrubber for. Simply stated, to create negative air pressure more air needs to leave a room than is entering it. However, it is worth noting that more often, oxygen depletion is not always the main concern for poorly ventilated enclosed space, but more of CO2 accumulation.In order for an air scrubber to remove contaminants from an environment, we need to create negative air pressure. To estimate the duration that the oxygen level can last for a given space, refer to the calculator below. Without a proper ventilation, the oxygen level in a concealed 10m2 room of 2.5 m height can only last up to 1.5 days with room occupancy of 5 in moderate level of activities. The same air recirculates through the AC system over and over again. Surprisingly, most split air conditioners do not introduce any fresh air into the room it is cooling. Fresh Air Change relates to the air volume flow of fresh air into the room through a fan or the air-conditioning system. Exhaust Air Change relates to the air volume flow of air out of the room through the action of an exhaust fan. ![]() Supply Air Change relates to the total mixed air volume flow of recirculating and fresh air into the room through an air-conditioning system. The concept of air change can also be equated to airflow, CFM of Supply, Exhaust, or Fresh Air.
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