Draft tests are usually performed by a home energy performance professional with a device called a blower door. This test determines how much air is leaking through cracks and holes in the home’s walls, ceilings, and floors. The blower door equipment uses a strong fan to pressurize or depressurize a house and then measure how drafty it is. While the test is being conducted, the analyst can use an infrared camera to look at the walls, ceilings, and floors, to find specific locations where insulation is missing and air is leaking. Nonharmful smoke sticks can also be used to find air leaks.