Technical data
Page 52 
8  FLUES 
8.1  Flue Options, Components & Dimensions 
The  use  of  any  flue  system  other  than  that  supplied  or  recommended  by  the 
manufacturer will invalidate the warranty. 
The following flue options are available from Warmflow: 
FBF    Low Level Balanced Flue Kit  
HBF  High Level Balanced Flue Kit 
VBF    Vertical Balanced Flue Kit 
HFL    Horizontal Entry Flue Liner Kit 
VFL    Vertical Entry Flue Liner Kit 
UPMK  Utility Plume Management Kit 
KPMK  Kabin Pak Plume Management Kit 
8.1.1 Conventional Flue Guidelines 
The  flue  system  should  be  designed  in  accordance  with  local  bye-laws  and  the 
Building  Regulations.  Draught  stabilisers  are  not  recommended  for  oil  fired 
boilers.  Sharp  bends  or  horizontal  runs  should  be  avoided  and  the  flue  should 
terminate 2 feet (600mm) above the ridge of the dwelling. Terminals which restrict 
the discharge or allow ingress of water should be avoided. 
When connecting to an existing masonry chimney, a  Warmflow HFL or VFL 
flexible flue liner suitable  for use with oil fired condensing boilers and of an 
appropriate  diameter  must  be  used.  The  annular  space  must  be  filled  with 
insulation and sealed top and bottom. 
Only  Warmflow‟s  flue  systems  designed  specifically  for  use  with  oil-fired 
condensing boilers may be used. 










