BS 5440-1. Flueing and ventilation for gas appliances of rated input not exceeding 70kW net (1st, 2nd and 3rd family gases). Part 1 Specification for installation of gas appliances to chimneys and for maintenance of chimneys
BS 5440-1. Flueing and ventilation for gas appliances of rated input not exceeding 70kW net (1st, 2nd and 3rd family gases). Part 1 Specification for installation of gas appliances to chimneys and for maintenance of chimneys
Installation and maintenance of flues and ventilation for gas appliances of rated heat input not exceeding 70 kW net (1st, 2nd and 3rd family gases)-Specification for installation and maintenance of flues
Chimneys, flue pipes and ventilation for gas appliances of rated input not exceeding 70 kW net (1st, 2nd and 3rd family gases)-Installation and maintenance of ventilation provision for gas appliances. Specification