Length of flue for suspended unit heaters
Cabinet Heaters (Floor-Standing) Maximum 8 meters, reduce maximum length by 1 meter for every 900 bend,
Radiant Heaters (Suspended Tube Heaters) Maximum 10 meters, reduce maximum length by 1 meter for every 900 bend, and for every 450 bend
Flue Test Points - if the test point is inaccessible, drill a hole in the flue between 300mm to 1000mm from the heater's flue spigot
Room Sealed Inlet Spigot Diameter - The inlet (combustion air) spigot is the same diameter as the outlet (combustion gas spigot)