Kair Stainless Steel Wall Vent - 4 inch / 100mm Bull-Nose Vent with wire mesh Wall-mountable High-Quality Stainless Steel Louvred Bull-Nose outlet with fixed grille and unique styling. Includes screws, drip deflector and rubber seal. Suitable for external or internal use Provides natural free air circulation. Outer fascia diameter = 133mm. Grade 304 Stainless Steel 18/10 100% In compliance with Part F Building Regulations. Aesthetically pleasing modern design 97mm Male Spigot will fit inside Kair 100mm round female rigid ducting Part: DUCVKC250 or 102mm flexible hose Part: DUCP0092/102/35. Easy to fit and durable. Can be used as a stand-alone passive vent or as a termination or supply point with your Bathroom or Kitchen extractor fan, Hydroponics fan, or In-Line Extract Fan. This 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. This 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. Wall mounted outlet with fixed grille and unique styling with natural free air circulation. Includes fly screen, screws, drip deflector and rubber seal. For use with extractor fans, cooker hoods and all general domestic and commercial applications.