<p>This Architectural drawing is layout of Drain pipe and Vent pipe of Bathroom. Drainage pipes carry waste out of your home to either the city sewer or a septic tank. Vent pipes supply fresh air to each plumbing fixture in the house, which helps the system move water through the drainage pipes each time a toilet is flushed or a sink is drained. Drain pipes allow water and waste to flow out of your home and into the sewer system. A water or supply line brings the water in and lets you fill your sinks, bathtubs and washing machine. <strong>A plumbing vent pipe works alongside your drain pipes, except it doesn't carry water</strong>. <strong>For pipes that have a diameter of 3 inches the distance is 6 feet and for a 4-inch pipe the most it should be away from the vent is 10 feet</strong>. Keep in mind that toilets have their own traps so there is no need to have one on the drain line, but it still must have a vent. Without getting too far into building science, a general plumbing rule of thumb is that every drain needs a trap, and <strong>every trap needs a vent</strong>. All those traps and drains are designed to prevent sewer gas from entering your home. For more Details and Information Download the Drawing File.</p>