Dryer vents should always be vented through the side of the house and not vented through the roof and ideally the exit should be fairly close to the ground.
How to tell if dryer vent goes to roof.
Brush it down using this dryer vent cleaning kit.
These terminals need to be cleaned on a regular basis to prevent lint buildup.
If lint builds up near the outlet vacuum it out.
Step 2 remove the dryer vent cover.
Considering that back pressure higher than 6 wci is generally recognized as inefficient you can see that venting through the roof with non dryer specific vents is immediately problematic.
Dryer vents don t need cleaning.
If you can remove it.
Go up to the attic and disconnect where it s making the first turn.
Turn your dryer on.
Use a dryer vent auger to remove stubborn buildups from deep inside the pipes.
Go to the back of your dryer moving it if necessary.
Connect it back and go to the second turn.
To make the dyer more efficient you can buy an inexpensive heat diverter and install it in the exhaust duct of electric dryers only not gas dryers you ll save about 50 worth of heat per load in the winter.
Connect back and perform the same procedure at the third turn.
You can remove some of this with your hands.
You now have a clean dryer vent.
The new dryerjack is the most efficient.
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.
Remove the guard to the dryer vent on the roof.
Do the same thing brushing towards the first turn.
The less back pressure is created by the roof vent the more efficiently the system performs.
At this point now that your dryer is not connected to any power sources it is safe to work on your dryer vent.
Go in the house and blow from the dryer toward the outside vent.
Now it is time to remove the vent cover near your dryer so that you can clean out any debris that has accumulated inside.
Keeping a clean dryer vent is much easier when you can safely reach the exit.
You might find that there are gobs of lint stuck on in.