National Ventilation Monsoon Series Round Louvred Fixed Grille with flyscreen is mounted to wall, ceiling or soffit mounting. It is very easy for the installation and reduce owner’s risk and also complies with building regulations. Suitable for domestic and commercial use.- Wall, Ceiling or Soffit Mounted- Domestic and commercial use- Quick and Easy to Install- Accepts 100mm (4″) round ducting- Complies with building regulations