A duct exercise specifies a friction rate of 0.15 inch of water column per 100 feet and an equivalent length of 75 feet, already including fittings. What pressure loss does this segment contribute at that rate?
- A0.1500 inch of water column
- B0.2000 inch of water column
- 0.1125 inch of water column
- D11.2500 inches of water column
Where to look it up
Explicit exercise assumptions; not a universal code requirement.
Why C is correct
Pressure loss = 0.15 × 75/100 = 0.1125 inch of water column. This is an assigned design rate, not a universal IRC limit; equivalent length already includes fittings, so do not add them again.