ELECTRICAL REQUIREMENTS VENTING REQUIREMENTS ■■ To supply the required 3- or 4-wire, single phase, 120/240 Determine vent path: ■■ Select route that will provide straightest and most direct path outdoors. ■■ Plan installation to use fewest number of elbows and turns. ■■ When using elbows or making turns, allow as much room as possible. ■■ Bend vent gradually to avoid kinking. ■■ Use as few 90° turns as possible.