I am adding whole house fans and to reduce the noise I am ducting the air from the intake register to the 2 fans 15' away in the attic. I intend to connect the intake register to the fans via 2 x 14" flexible duct. I need to make 2 x 45 deg turns on each fan. Airflow is 1600 cfm/fan. Is this going to reduce my airflow in any significant way?. Obviously I want max airflow.
Thanks to the group.
Last edited by Speedbird; 03-11-2009 at 10:35 PM.