Allowable Duct Length
Calculates maximum allowable
This easy-to-use, flexible tool calculates maximum allowable duct length to hit
a given delivered cfm airflow level based on basic inputs: CFM required, fan
model, duct diameter, duct type (flex or rigid) and number of elbows. One
of its many convenient applications is the ability to demonstrate on-the-spot
2015 IRC code compliance without field testing or the use of complex tables.