Or do you mean dryer vents??
By code, dryer vents are not allowed to have any more than one or two 90-degree bends. Which most likely it already has them. I forget the exact code, but I know a code does exist.
"It's You vs. You"
"People Throw Rocks At Things That Shine"
My Equipment Brag List:
-1 CAT hat
-16 pairs of Hanes socks (the Heavy Duty model), many with holes.
-12 pairs of underwear, ranging from Joe Boxers to Jockey, many are in need of replacement. (no more photo requests please)
-hundreds of t-shirts. Some w/ grease stains, some torn & tattered.
-7 pairs of jeans, ranging from Levis to Polo to GAP. 1/2 of them have holes in 'em.
-1 pair of old worn out Nike shoes.