Damper Pressure Drop

[crroda]

In designing duct systems, it is helpful to account for all of the system component pressure drops. What is a reasonable estimate for the pressure drop (in. w.c.) or equivalent length (ft.) for a round damper

[Eric K.]

The design of the URD dampers provides very little resistance to air flow and posses a low pressure drop. The pressure drop across a URD damper will be no higher than 0.005-0.01 inches of H20 with an approach velocity of 700-900 FPM.

Eric

[crroda]

that pressure drop is hardly worth any concern. Thanks for your fast reponse.