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size relief air duct work on vav system with no return fan.

size relief air duct work on vav system with no return fan.

size relief air duct work on vav system with no return fan.

(OP)
Can any one tell me the formula, rule of thumb, for sizing the duct size for the relief air dampers on a vav system with no return fan. .05" sp.

jlf01

RE: size relief air duct work on vav system with no return fan.

For unducted return air shaft sizing, maximum
velocities should be in the 800 fpm to 1200 fpm range
through the free area at the top of the shaft (highest
airflow rate). Gradually reduce the velocity down to about
500 fpm at the zone level

see:http://www.energydesignresources.com/docs/db-04-avavsys.pdf

RE: size relief air duct work on vav system with no return fan.

(OP)
Thanks imock2 this is helpfull.

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