Unfortunately, most furnace filters are slid in place without an airtight seal, which allows air to pass around the filters. This problem is worse for the higher-efficiency MERV filters because of the increase in air resistance.
Common Cause is a network of people working to help rebalance cultural values to create a more equitable, sustainable and democratic society. 1  We are all shaped by our culture.
Fourth, the definition implies that a problem may have more than one root cause. In our early experience investigating and reviewing hundreds of incidents we found that, on the average, incidents had two to three root causes per simple incident (a simple incident is one with one or two causal factors).