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Exhaust Fan ductwork

NickRoseSN1985

NickRoseSN1985

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I have been testing a window exhaust fan to reduce humidity. One added benefit I have noticed is co2 has been reduced from the 1100 to the 600s. So I decided to buy a Panasonic FV-40NLF1 In Line Fan.

Does anyone work on HVAC systems? I have a question dealing with ductwork size. The unit has a 8inch connection. I would like to reduce it to 6inch ducting. Would this decrease efficiency and increase noise?
 
The unit was already delivered. Yes I could return it but I rather keep it. Got some help on the humblefish forum. I went ahead and bought the 8 inch ductwork from Home Depot and 8 inch roof vent from Ace Hardware. Now just need to find time to install it.
 
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