Installing exhaust fan.contractors previously had used a flexible plastic non insulated duct which filled with water.it was vented through the side wall 5 foot away.I live in a cold climate in pa.cold winters.The calculated cfm was 47 and had a 50 cfm fan installed.I bought a 80 cfm fan.Heres my question.I planned venting through sidewall like before and bought r-8
Chris, Q. Does bathroom vent piping need to be insulated? A. Yes. Otherwise the exhaust duct gets too cold when it runs through the attic. A cold duct allows condensation of moist indoor air, leading to drips from the exhaust fan.
In general for a bathroom, you'll be looking to have an Air Change per Hour (ACH) of 8. To accomplish this, you'll have to select a fan based on the size of the bathroom, and the equivalent duct length. Bath room size. The first thing you'll have to figure, is the size of the bathroom. For this, simply multiply Length (ft.) * Width (ft.)* Height (ft.). This will give you the size of the room in cubic feet.
Bathroom vent fans must be vented to the out of doors. Venting this fan into the attic is simply asking for problems. The excessive moisture will cause condensation on the roof members, insulation and eventually cause mold. It is never OK to vent directly into an attic even if the attic itself is vented. So, the simple correct answer is NO.
Enhance your bathroom with the help of this Duct-Free Wall or Ceiling Mount Exhaust Bath Fan from NuTone. Easy to install.
NuTone fans function as BOTH traditional bathroom fan for removing humidity and odors on the spot, OR as continuously running fan to constantly remove contaminants trapped throughout the home. Problems such as humidity, odors, dust, pet dander, and various chemicals will be eliminated.