PP Air Vent Grille 4 Inch Round Spigot Backdraught Stop(70mm)

• Effective Backdraught Prevention: Features automatic gravity shutters that close when the fan is , effectively stopping unpleasant odours, noise, and cold draughts from flowing back into your room without using breakable springs.
• for versatile Application: Perfectly suited for bathroom and kitchen extractor fans, hydroponics setups, or in-line extract fans; integrates seamlessly into whole house ventilation, AC, and heat recovery systems.
• for durable Material: Constructed from White PP (Polypropylene) that withstands temperatures up to 100°C, offering superior stiffness and resistance to moisture, acids, and alkalis compared to standard polyethylene.
• Easy Push-Fit Installation: Designed with a 4-inch (100mm) round male rear spigot for effortless push-fit connection to ducting; for ideal for DIY projects requiring quick and tool-free setup for indoor or outdoor use.
• Regulation Compliant Performance: Suitable for use in compliance with Part F Building Regulations; independently tested airflow performance ensures efficient ventilation while acting as a barrier against insects and debris.

Feature： * for Type for B: It is suitable for air conditioning holes and openings with shutters, with ventilation function. *Material properties: , tasteless, low density, strength, stiffness, hardness and heat resistance are better than low pressure polyethylene, can be used at about 100°C. It has good dielectric properties and high for frequency insulation, and is not affected by moisture, but becomes brittle at low temperature, not wear-resistant and ages easily.Suitable for making for general mechanical parts, resistant parts and insulating parts. Ordinary such as acids and alkalis have little influence on it and can be used in dishes. Details： *Material:PP *Color:white *Size: 40mm，50mm，60mm，70mm，80mm，100mm(as shown in the picture) Package Contents: 1Pc x Plastic cover