The Flex-Z Fast Installation Bracket with articulating joints is ideal for positioning the fan exactly where you want it, in old or new construction. WhisperGreen Select incorporates an integrated dual 4" or 6" duct adapter to give you flexibility in duct layout and design. For short runs, you can go with a smaller duct size, but long runs are ok too - just move up to the 6" duct. Also fits in 2 x 8 construction. Panasonic fans are UL listed for tub/shower enclosure (just install them on a GFCI-protected circuit). With these great features, your installation options open up.