Ducts diameter and cross sectional area circular ducts and cross sectional areas.
Standard rectangular duct sizes mm.
Sizing is based on airflow needs per cubic foot per minute as well as velocity.
Spiral ducts dimensions standard dimensions.
Rectangular rectangular or square ducting comes in standard sizes ranging from 3 by 7 inches to 35 by 40 inches.
Maximum size of duct or pipe through steel joists k series joists and maximum size of ducts and pipes.
Rectangular air ducts velocity diagram velocity diagram for rectangular air ducts metric units.
The standard dimensions of ducts and fittings range between 130 mm and 2500 mm for any side length.
Enter an internal duct size this must be limited to a maximum aspect ratio of 5 1 for the results to be valid the resulting vel ocity and pressure drop per unit length are displayed in the blue box.
Rectangular 10 3750 400 1000 2000 the air tightness classes are specified in the table below.
Equivalent diameter rectangular and circular hvac ducts equivalent diameter for rectangular and circular ducts air flows between 100 50000 cfm maximum size of duct or pipe through steel joists k series joists and maximum size of ducts and pipes.
The ducts and fittings below and above these sizes are available on request.