Air Duct Calculator
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Hart & Cooley - Air Duct Calculator Flexible Duct Friction Loss Calculator 1. Enter Friction Loss (inches of water), Duct Airflow (CFM), Duct Length and the number of bends. 2. Read Duct Diameter (inches) and Duct Velocity (FPM). Friction Loss (inches of water) 1.60
Duct Airflow (CFM) 2000
Duct Length (feet) 100
90o Bends (quantity)
45o Bends (quantity)
180o Bends (quantity)
Duct Diameter (inches) 11.9
Duct Velocity (FPM) 2591
90o Bends (quantity)
45o Bends (quantity)
180o Bends (quantity)
Friction Loss Per 100' of duct (inches of water) 1.60
Duct Velocity (FPM) 2548
90o Bends (quantity)
45o Bends (quantity)
180o Bends (quantity)
Duct Diameter (inches) 12
Friction Loss Per 100' of duct (inches of water) 0.87
90o Bends (quantity)
45o Bends (quantity)
180o Bends (quantity)
Duct Diameter (inches) 12
Duct Velocity (FPM) 2548
90o Bends (quantity)
45o Bends (quantity)
180o Bends (quantity)
Friction Loss Per 100' of duct (inches of water) 0.87
Duct Velocity (FPM) 2548
1. Enter Round Duct Diameter (inches), Duct Airflow (CFM), Duct Length and the number of bends. 2. Read Friction Loss (inches of water) and Duct Velocity (FPM). Duct Diameter (round) (inches) 12
Duct Airflow (CFM) 2000
Duct Length (feet) 100
Sheet Metal Duct Friction Loss Calculator 1. Enter Duct Airflow (CFM), Duct Velocity (FPM), Duct Length and the number of bends. 2. Read Round Duct Diameter (inches) and Friction Loss (inches of water). Duct Velocity (FPM) 2548
Duct Airflow (CFM) 2000
Duct Length (feet) 100
1. Enter Friction Loss (inches of water), Duct Airflow (CFM), Duct Length and the number of bends. 2. Read Duct Diameter (inches) and Duct Velocity (FPM). Friction Loss Per 100' of duct) (inches of water) 0.87
Duct Airflow (CFM) 2000
Duct Length (feet) 100
1. Enter Round Duct Diameter (inches), Duct Airflow (CFM), Duct Length and the number of bends. 2. Read Friction Loss (inches of water) and Duct Velocity (FPM). Duct Diameter (round) (inches) 12
Duct Airflow (CFM) 2000
Duct Length (feet) 100
Equivlent Rectangular Duct 1. Enter Round Duct Diameter. 2. Enter the Desired Length of the Rectangular Duct. Round Duct Diameter Rectangular Duct Length
Approximate Dynamic Loss Coefficients Rectangular Duct Width
(Inches)
(Inches)
(Inches)
16
14
14
Main Duct Residential 900 fpm Commercial 1,300 fpm Industrial 1,800 fpm
Equivlent Round Duct Diameter 1. Enter the Length of the Rectangular Duct. 2. Enter the Width of the Rectangular Duct. Rectangular Duct Length (Inches) 14
Rectangular Duct Width (Inches) 14
Maximum Recommended Supply Velocity Branch 600 fpm 900 fpm 1,000 fpm
Round Duct Diameter (Inches) 16 Copyright © 2004 by Hart & Cooley, Inc. All Rights Reserved.
Duct Airflow (CFM) 2000
Duct Length (feet) 100
90o Bends (quantity)
45o Bends (quantity)
180o Bends (quantity)
Duct Diameter (inches) 11.9
Duct Velocity (FPM) 2591
90o Bends (quantity)
45o Bends (quantity)
180o Bends (quantity)
Friction Loss Per 100' of duct (inches of water) 1.60
Duct Velocity (FPM) 2548
90o Bends (quantity)
45o Bends (quantity)
180o Bends (quantity)
Duct Diameter (inches) 12
Friction Loss Per 100' of duct (inches of water) 0.87
90o Bends (quantity)
45o Bends (quantity)
180o Bends (quantity)
Duct Diameter (inches) 12
Duct Velocity (FPM) 2548
90o Bends (quantity)
45o Bends (quantity)
180o Bends (quantity)
Friction Loss Per 100' of duct (inches of water) 0.87
Duct Velocity (FPM) 2548
1. Enter Round Duct Diameter (inches), Duct Airflow (CFM), Duct Length and the number of bends. 2. Read Friction Loss (inches of water) and Duct Velocity (FPM). Duct Diameter (round) (inches) 12
Duct Airflow (CFM) 2000
Duct Length (feet) 100
Sheet Metal Duct Friction Loss Calculator 1. Enter Duct Airflow (CFM), Duct Velocity (FPM), Duct Length and the number of bends. 2. Read Round Duct Diameter (inches) and Friction Loss (inches of water). Duct Velocity (FPM) 2548
Duct Airflow (CFM) 2000
Duct Length (feet) 100
1. Enter Friction Loss (inches of water), Duct Airflow (CFM), Duct Length and the number of bends. 2. Read Duct Diameter (inches) and Duct Velocity (FPM). Friction Loss Per 100' of duct) (inches of water) 0.87
Duct Airflow (CFM) 2000
Duct Length (feet) 100
1. Enter Round Duct Diameter (inches), Duct Airflow (CFM), Duct Length and the number of bends. 2. Read Friction Loss (inches of water) and Duct Velocity (FPM). Duct Diameter (round) (inches) 12
Duct Airflow (CFM) 2000
Duct Length (feet) 100
Equivlent Rectangular Duct 1. Enter Round Duct Diameter. 2. Enter the Desired Length of the Rectangular Duct. Round Duct Diameter Rectangular Duct Length
Approximate Dynamic Loss Coefficients Rectangular Duct Width
(Inches)
(Inches)
(Inches)
16
14
14
Main Duct Residential 900 fpm Commercial 1,300 fpm Industrial 1,800 fpm
Equivlent Round Duct Diameter 1. Enter the Length of the Rectangular Duct. 2. Enter the Width of the Rectangular Duct. Rectangular Duct Length (Inches) 14
Rectangular Duct Width (Inches) 14
Maximum Recommended Supply Velocity Branch 600 fpm 900 fpm 1,000 fpm
Round Duct Diameter (Inches) 16 Copyright © 2004 by Hart & Cooley, Inc. All Rights Reserved.
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