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The CFM for this unit reads at 400. I can say that it does move the air surprisingly fast. It also has a four way selection for the fan that also makes it run quietly, depending on the speed selection. The exhaust size for the top of the unit is 10 x 3 1/4 with little wiggle room. I think in the manual reads that its standard size.
Sorry, there was a problem. Please try again later.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.
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