When installing dryer exhausts always use foil tape which is easily located online or at hardware stores. Make sure to cover all cracks and any place that looks like air might escape from the line.
Another reason to use tape is because screws inserted into the feed line can be a place where lint can build up over time. And don't be stingy with the tape, use plenty to make sure you have a good seal.
Also because over time the tape itself may lose a little of it's sticking power and if you've secured it well to start with you will have to inspect less and you clothes will dry faster.
When your duct has quite a distance to travel you have to watch how many curves you have, it's always better to have smaller curves like 45 degree angles to get where you want to go and not too many of those. Support long feeds with metal brackets.
If you go through any part of an area of your home that is not already insulated you might want to think about insulating the duct work in this area because it can impede the air flow if it's causing water build up from condensation.
Almost all manufacturers of dryers say to use metal with your dryer duct fans even know people seem to use the flexible plastic kind. You definitely have to use metal when going through walls or for any kind of distance.
Check you local neighborhood building codes for details in your area when installing dryer ducting.
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