Ontario School Safety
Would you look at that. DIY air purifiers are even more cost effective than we initially thought! Looks like filters only need to be changed once during the school year for cr boxes. Which gives school facilities enough time over the summer to officially check each one!
Jim Rosenthal
These tests were done to determine the long term effectiveness of MERV 13 filters in #corsirosenthalboxes. These CR Boxes were used 24/7 in an office/factory. They had about the same efficiency and flow at 10 months. Both the App. J in 52.2 and ISO 16890 miss by a wide margin.