Regulated roof-vents are used for gravitation ventilation. They are available in non-insulated, insulated versions and with electric fan. Insulated type prevents from condensation of water-vapour in the air-duct. The elctric fan version is designed for fo

Regulated roof-vents are used for gravitation ventilation. They are available in non-insulated, insulated versions and with electric fan. Insulated type prevents from condensation of water-vapour in the air-duct. The elctric fan version is designed for fo