Here's how: 1  Stand with your feet shoulder-width apart and knees bent slightly. 2  Lean forward, placing your hands just above your knees. 3  Round your back so that your chest is closed and your shoulders are curved forward.  Then arch your back so that your chest opens and your shoulders roll 1  back. Repeat several times.
Typically this count is between 100,000 and 300,000 shutter actuations, with the latter limit associated with the EOS-1D models. In fact, the Camera Shutter Life Expectancy Database is a really neat user-based site for DSLR models of several brands, including Canon.
Most exterior shutters are made of wood or vinyl, and come in a variety of styles. Storm (hurricane) shutters are used in areas where hurricanes can break exposed glass. Wooden or vinyl exterior window shutters in stock sizes cost $20-$200 per pair of panels. Price depends on materials, size, and brand name. Home improvement stores like Home Depot carry exterior window shutters in a range of styles.