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.
cause. 1  anything producing an effect or result. 2  a person or thing acting voluntarily or involuntarily as the agent that brings about an effect or result: drinking was the cause of his downfall. 3  a reason, motive, or ground for some action, feeling, etc.; esp., sufficient reason: cause for complaint.