Airflow Operated gravity shutter is a rain and weatherproof vent finished in black colour- The item is made from premium quality plastic- The Overall external dimensions of the grille - 155 mm x 155 mm with 4" / 100mm dia duct conection 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 syste m is not in use- the Grille shutter flaps close automatically. This is designed to protect your ventilation 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-
Simple 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 cover can be used as a part of a long ductwork run for a variety of purposes- Whole House ventilation- conditioning ducting- passive ventilation- positive input- HVAC- Heat Recovery Systems and to cover Bathroom- Kitchen air conditioning Fans-
The Gravity Outlet is manufactured in compliance with the Building Regulations: Approved Document F-