Expect to pay $35-$55 per linear foot (including labor and materials) Doesn't include engineering design and commissioning/start up costs. This amounts to an average of $1,000-$5,000 for a typical home. An average single-family home needs anywhere from 30 to 90 linear feet of ducting, but the specific total length depends on your home's unique layout.
Mechanical Engineer expert in HVAC Systems and Duct Working - Can design and construct systems to pressure classifications between - 3 in.w.g to 10 in. w.g (-750 Pa to 2500 Pa), although systems operating at much higher pressures and temperatures are also possible to design/construct, subject of course to much higher Cost Factors,
The engineering would roughly be 10% of the total installation cost, which includes:
a, Material Selection
b. Methods of Construction
c. Economics of Duct Systems
d. Duct System Layout
e. Calculation of System Pressure Losses
f. Fan Dimensioning and Section
g. Duct Permissible Leakage
h. Acoustic (Noise and Vibration) Considerations
i. Testing, Adjusting and Balancing.
j. Proper Support Selection, Construction and Placement.
Materials, equipment and construction methods must be chosen w.r.t systems's first costs and life cycle costing. Good design is of paramount importance with emphasis on energy conservation, trying to strike proper balance between duct sizes chosen and the spaces allocated and duct system pressure losses (fan power /costs).
Please contact me to discuss project in more detail.