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.
Hobbies: cats, history enactment, behavioral psychology. A direct cause is when you can determine beforehand the result: for example a car accident makes a dent on the car, or injures the passengers. An indirect cause is a chain of effects, that are difficult or impossible to predict.