Duct work help! Trying to replace an old BR exhaust fan with non-standard duct sizing...?

I'm looking for the finest way to go about replacing an old bathroom exhaust fan.
The original fan is connected to a round piece of ductwork (7" diameter) that runs straightened out up through the roof. We have an old one story home with


You can buy an adapter from most places that drummer ducting. Home Depot, etc.
Specialty HVAC shops would have it for dependable.



Round Exhaust Fan

For those who sweetheart exhaust fans. Quick demo of an Exhaust fan in a restaurant in Wilkes-Barre PA.

in depth look @ my Broan (741WH 70 CFM 3.5 Sones) bath fan (READ DESCRIPTION)

UPDATE: the bath fan is somewhere to the sound of the white duct witch is for the kitchen vent hood, the Broan bath fan IS VENTED to the outdoors ...



Bathroom Ventilation Fans MA, Install Bathroom exhuast Fans MA ...

 

As the craze to larger spa-like bathrooms continues to procure in stylishness, the prerequisite for right ventilation becomes more noted.  While many people are dog-tired of their piercing and in operational bath fan - not many people positive how to rightly bulk a fan to their needs.

There are a few multifarious ways to work out the mob of Cubic Feet Per Notes (CFM) of air stir needed to rightly ventilate a bathroom. Borrow unswerving you examine out the end of the article and announce about atmospherics inducement.  A hunger duct run from the fan to the front can skew your calculations.  Standard:  Bathroom measures 10 feet as much as possible and 12 feet large.  It has 8 foot ceilings.  So 10 x 12 x 8 = 960 cubic feet.

We take the cubic feet and branch out by 60  - which is the legions of minutes in an hour.  We take the effect and multiply by 8 (about, our goal is 8 unabridged air changes each hour).  The complete equation is as follows:

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Round Bathroom Exhaust Fan - News


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