POWER SWITCH TRANSISTOR-The part responsible for switching off the primary circuit that causes high voltage induction in the secondary winding in an electronic ignition system. PRIMARY SPEED SENSOR-An engine speed sensor located inside the actuator housing on the back of the injection pump.
Costs for green roofs in the United States are estimated to average between $15 to $20 per square foot for all use types, i.e., high density residential, commercial, industrial etc.1 These costs include all aspects of green roof development, from the waterproofing membrane to soil substrate creation to planting.
1 Metal roofs cost anywhere from $3 per square foot to $20 per square foot or more (or $4,500 to $30,000 for a 1,500 square foot roof). 2  Aluminum roofing costs $6 to $12 per square foot ($9,000 to $18,000).  Steel roofing costs $3 to $10 per square foot ($4,500 to $15,000).