The official recommendation from the adc is that flex ducts should sag no more than 1 2 per foot of length between supports.
Ok to attack duct directly to roof vent.
Although this isn t always possible in attic crawl spaces you should always insulate the duct to prevent condensation problems.
Or you may have a distance issue.
Insulating the duct may also help.
The flex duct makes the bends easy don t kink it and allows the fan to be repaired from below in the future.
You may have a bad boot around the roof vent that is leaking into the attic.
The fan ducts were attached to a t fitting in the 4 inch abs main sewer vent stack in the attic just below the roof.
First plan your route.
After sleeping on it i am having a hard time coming up with any legitimate reason it can t work and can t think of any problem it could cause.
You can find 4 in.
If you can put an equal size duct inside the turn as shown below they say you re ok.
In all cases the ducting needs to conduct the exchaust to the building exterior and needs to terminate in an animal proof vent cover.
Section of straightened coat hanger into a drill.
The safest way to check the attic directly above the stove is to chuck an 18 in.
For that length i don t think you need to worry.
This article describes routing bath exhaust fan duct upwards through an attic or roof space or downwards through a floor or crawl space.
The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood.
I have never seen this before and at first thought considered it wrong.
The owner s manual will usually tell you specifics on duct sizes and lengths.
Duct already wrapped in insulation at home centers.
These specialty vents do not affect the.
No you shouldn t use a towel or other absorbing material.
The high humid air doesn t vent out of the house before it condensates in the duct and then runs back into the house causing damage.
Every register should be fed directly from the central unit or basement trunk line by its own duct.
Bathroom ventilation fan duct routing routing a bath vent duct down out or up through an attic or roof out.
Today i saw a very creative way to vent bathroom fans.
Another biggie that i see all the time is sagging ducts.
The vent should exit the building through the roof or wall at least 3 feet away from any other building openings and the vent cover which must not include a screen should allow dispersal of.
Rafter vents or insulation baffles install in any rafter space to create narrow gaps that direct fresh air from the soffit vents to the peak of the roof.
If you stacked registers on a single duct on second and third floors for instance all the.
