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240EdwardsStreet,SE
C;eve!and,Tennessee373tl
Te_:422-472-3333
Fax:423-478-67t0
RIGID DUCTWORK LIMITATIONS
Rigid metal ductwork should not exceed 50' of straight 4" duct. Each 90 degree elbow and
the exhaust hood should be considered equivalent to 8' of straight ductwork.
For example, if an exhaust hood and two 90 degree elbows are used, the maximum straight
duct allowed would be 26'. Not more than three 90 degree elbows should be used in any
rigid ductwork run with an exhaust hood. Four feet of straight duct should be allowed
between 90 degree elbows
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