Whirlpool 4396037RP Vent Periscope Photograph: amazon.com See It When there isn’t more than enough clearance powering your clothing dryer to accommodate a 4-inch dryer tube, a periscope vent, such as this design from Whirlpool, provides an modern solution.We provide no cost mould inspection, mildew testing, mildew removal, mildew repair, mould re