Basic Example: Pipe Slopes A $100\text{mm}$ sanitary pipe runs $15\text{m}$ at $2\%$ slope. Stack invert is $10.000\text{m}$. Find start invert.

Intermediate Example: Vent Stacks A dashed line connects a trap to a vertical pipe going through the roof.

Advanced Example: Water Supply Fixture Units (WSFU) A bathroom has a flush valve WC (10 WSFU), a lavatory (2 WSFU), and a shower (2 WSFU).

Basic Example: Wiring Layouts 3 lights connected by solid lines, a dashed line with an arrow, and a switch $S_3$.

Intermediate Example: Panel Schedules A circuit is labeled 20A, 1-pole. The load is $1800\text{W}$ at $120\text{V}$.

Advanced Example: Voltage Drop A 120V circuit runs $150\text{ft}$ to a $12\text{A}$ load. Max allowable drop is $3\%$.

Basic Example: HVAC Airflow A main duct is $800 \times 400\text{mm}$. Velocity is $5.0\text{m/s}$. Find $Q$ ($m^3/s$).

Intermediate Example: Duct Reductions A duct reduces from $800\times400$ to $600\times400$ after a branch takeoff.

Advanced Example: Return Air Plenums No return ducts are drawn in an office with a drop ceiling.