PPG07 – Determine Type Size and Routing of Duct System ( Including Air Intake and Exhaust Ducts)

STANDARD OF PERFORMANCE

Duct system must be sized to deliver required air-flow to spaces quietly and without excessive pressure losses.  Duct system must be designed to minimize structural modifications.  All calculations must be based upon approved data and formulas.

PERFORMANCE GUIDE

1. Review job specifications, examine structure and/or read blueprints.
2. Determine the
   • type or combination of types of duct required.
   • Location of air-handling equipment and duct connections.
   • Size and location of registers, air intake and exhaust.
   • Allowable duct velocities in system for noise consideration.
   • Static pressure capabilities and horsepower of fan.
3. Lay out routing of supply return intake and exhaust air duct.
4. Size ducts to provide correct air-flow for each duct run.
5. Calculate static pressure requirement for duct system as routed and sized.
6. Review layout to determine if structural modifications are necessary to accommodate duct sizes.
7. Lay out new routing and resize if structural modifications are not feasible or if static pressure requirements are too high.
8. Document selections and prepare sketch that includes balancing dampers at appropriate locations.