VENTS UK Vents 4 inch Terracotta Gravity Grille Backdraft Shutter 100mm Extractor Fan Back Draught Grill for Air Con Ducting House Bathroom Kitchen Shower Toilet Fans External Vent Plastic Cover

VENTS is a growing manufacturer of domestic ventilation fans and equipment. We offer one of the largest selection of accessories such as electrical controllers, electrical speed controllers, roof vent kits, ducting and ventilation accessories and boxed venting kits. We offer selection of high quality mechanical extract ventilation fans, heat recovery products, electrical heating systems and cooling products. The airflow operated gravity shutter is a rain and weatherproof vent finished in terracotta colour. The item is made from premium quality plastic. The overall external dimensions of the grille - 155 mm x 155 mm with 4" 100 mm dia duct connection size for outdoor use. The grille has three non-return gravity flap outlets. The shutter works by extract air opening the blades to allow air to pass. When the extractor fan or ventilation system is not in use, the grille shutter flaps close automatically. This is designed to protect your property duct from unpleasant odours noises and to prevent backdraught air or rain penetration and entry of objects or vermin when the ventilation unit is not in operation. This gravity shutter vent has removable blades for simple cleaning and secure installation. Just push-fit duct and fittings together. If required, seal using a method of your choice (Popular options include Mastic Sealant Poly Cement or Tape). This gravity grille can be used as a part of a long ductwork run for a variety of purposes including whole house ventilation, passive ventilation, positive input, air conditioning, HVAC, and Heat Recovery Systems. The Gravity Outlet is manufactured in compliance with the Building Regulations in Approved Document Part F.