Non-domestic gas-fired convection air heaters for space heating not exceeding a net heat input of 300 kW, without a fan to assist transportation of combustion air ....(abbreviated)
Domestic gas-fired forced convection air heaters for space heating not exceeding a net heat input of 70 kW, without a fan to assist transportation of combustion ......(abbreviated)
Specification for dedicated liquefied petroleum gas appliances - Mobile and portable non-domestic forced convection direct fired air heaters (consolidated version)