Product review (4 stars): great vent just needs a little help
the directions were not very good if you needed to cut or resize. luckily my dad and i have some common sense when it comes to these things and we could use the full length with no cutting. the periscope allowed me to put the dryer very close to the wall, which was what i wanted. however, after a couple of days i had lint building up in  my laundry room. i stuck my hand down the side and felt a gap on the end of the periscope letting quite a bit of air escape while the dryer was running. we had to pull the unit out and tape the seams of the periscope. once we did this, there were no more air leaking problems. overall i would recommend this product. just tape the seams BEFORE you intall with foil tape.