Removes the need to access the exterior of a building to install a vent' Before installation make a mark at top dead centre on the outer part of the tube that will be inside the property to ensure that the vent grill is level. It is useful to be be in contact with someone outside who can see and tell you when the vent is protruding the correct amount out of the wall. Expanding foam injected into the core hole around the tube holds it firmly in position. The tube is slightly larger than some and some flexible ducting may require some effort to slide on also the moulding of the external grill may require some trimming with a sharp blade to remove some plastic left behind after moulding, of course inspect and do this before installation. As for UV bleaching only time will tell.
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