Hi Coach, this model is a 400 CFM Motor Class. As for the size exhaust, it is recommended that you use, the total length of the vent system including straight vent,
elbow(s), transitions, and wall or roof caps must not exceed
the equivalent of 140 ft (42.7 m) for either type of vent. See the
“Recommended Standard Fittings” section for equivalent
lengths. For best performance, use no more than three 90° elbows.
To calculate the length of the system you need, add the
equivalent lengths of each vent piece used in the system.
7 years, 2 months ago
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WhirlpoolTeam