| 摘要 |
<p>A covert roof ventilator (10) is manufactured by rotation moulding from plastics material and is provided with an upper wall (14) of shape complementary to roof tiles with which it is to be used an apertured lower wall (16) spaced from the upper wall with an elongated aperture (18) formed at a toe portion of the ventilator for receiving a combined grille (20) and baffle (22) the former for preventing the ingress of small mammals and birds to the inside of the ventilator and the latter for preventing the ingress of driven rain and/of snow and large insects to the inside of the ventilator and to the underside of the apertured lower wall thereof.</p> |
