A clear difference in HFCWO devices. Since therapies can be effective only when patients comply with them, the SmartVestÂ® Airway Clearance System from Electromed stands apart among high frequency chest wall oscillation (HFCWO) devices.
The 2012 USDA Plant Hardiness Zone Map is the standard by which gardeners and growers can determine which plants are most likely to thrive at a location. The map is based on the average annual minimum winter temperature, divided into 10-degree F zones.
Hardiness zones were first developed by the USDA as a guide for selecting appropriate plants for a particular location. It is based on the lowest sustained temperature that a plant can endure. In response to requests for better plant hardiness guidelines, the hardiness map has been updated, not by the USDA but rather the National Arbor Day Foundation.