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aspect ratio is the width to fight ratio in ducts which shouldnt exceed 4:1 as per ASHRAE
HVAC Duct width to height ratio is called Aspect Ratio. Maximum aspect ratio permitted by ASHRAE is 4:1( W : H)
Ration between width and height of duct is known as aspect ratio. 1:4 is standard aspect ration for duct design.
Aspect Ratio no more than 3:1 in Ventilation Duct.
The aspect ratio in HVAC is 1:4 to 4:1