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.
Common cold facts. 1  The common cold is caused by many different viruses. 2  The common cold is transmitted by infected airborne droplets or by direct contact with infected secretions. 3  Being in cold weather does not cause the common cold.