HVAC Procedure and Performance Guide
TASK : Determine type, size and routing of duct system (including ventilation 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.
- Review job specifications, examine structure and/or read blueprints.
- 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.
- Lay out routing of supply return intake and exhaust air duct.
- Size ducts to provide correct air-flow for each duct run.
- Calculate static pressure requirement for duct system as routed and sized.
- Review layout to determine if structural modifications are necessary to accommodate duct sizes.
- Lay out new routing and resize if structural modifications are not feasible or if static pressure requirements are too high.
- Document selections and prepare sketch that includes balancing dampers at appropriate locations.