Beckett AFII Manuel D’Utilisation

Any accumulation of soot or debris in chimney 
offsets should be removed
Any obstructions such as a protruding joint or a 
piece of broken tile wedged in the chimney should 
be removed.
No other appliance connection should be made to 
the same fl ue pipe.
The fl ue pipe should have an upward pitch toward 
the chimney of at least 1/4” per foot of length. It 
should fi t tightly and should not project into the 
chimney.
Any leakage between tiles, around clean-out doors, 
or around the vent pipe should be sealed.

INSULATED STAINLESS STEEL CHIMNEY LINERS

3.

4.

5.

6.

7.

The new designs of high effi ciency oil furnaces and 
boilers in conjunction with fl ame retention oil burners 
are more effi cient. One result of increased effi ciency is 
lower fl ue gas temperatures. As fl ue gases rise in the 
chimney, they will cool and condense when they reach 
the dew point. The condensation will mix with the sulphur 
in the fl ue gases creating sulphuric acid. The acid will 
attack the chimney mortar, brick and clay liners causing 
corrosion, deterioration and blockage of the chimney. 

ATC codes for usable air tube lengths dim. “A” (Figure 3)

Firing rate range (gph)Min-Max

3”

5”

7”

9”

ATC Code

Head

AFII  85

AFII 100

AFII 150

Adjustable 

w/stop screw 

Head Design

HLX30

HLX50

HLX70

HLX90

HB

AF2-6

0.4-0.85 gph

0.65-1.00 gph

0.75-1.35 gph

HLX30

HLX50

HLX70

HLX90

HC

AF2-9

N/A

0.65-1.00 gph

0.75-1.50 gph

HLX30

HLX50

HLX70

HLX90

HD

AF2-6

0.40-0.85 gph

0.65-1.00 gph

0.75-1.10 gph

HLX30

HLX50

HLX70

HLX90

HE

AF2-9

N/A

0.65-1.00 gph

0.75-1.35 gph

Head Design 

- Fixed

FBX30

FBX50

FBX70

FBX90

HFXS

FB0

0.40-0.65 gph

0.55-0.75 gph

0.75-1.00 gph

FBX30

FBX50

FBX70

FBX90

HGXS

FB3

0.55-0.85 gph

0.55-1.10 gph

0.85-1.20 gph

FBX30

FBX50

FBX70

FBX90

HHXS

FB4

N/A

0.75-1.10 gph

1.10-1.25 gph

FBX30

FBX50

FBX70

FBX90

HIXS

FB6

N/A

0.85-1.15 gph

1.15-1.35 gph

Firing 

Rate 

(gph)

Round 

I.D.

Rectangular

Height

Floor to 

nozzle

Width

Length

0.50

8

7

8

12

5 to 6

0.75

9

8

9

12

5 to 6

1.00

10

9

10

12-1/2

5 to 6

1.25

11

10

11

12-1/2

5 to 6

1.50

12

11

12

13

6 to 7

Carefully inspect the chimney or exhaust vent 
system.
Make sure it is properly sized and in good working 
condition. 
Follow the instructions supplied by the appliance 
manufacturer.
The installation must strictly comply with all 
applicable codes, authorities having jurisdiction and 
the latest revision of the National Fire Protection 
Association Standard  NFPA 31 for the installation of 
chimneys and vent sizing, (or CSA-B139 and CSA-
B140 in Canada).
Regulation by these authorities take precedence 
over the general instructions provided in this 
installation manual.

y

y

y

y

y