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Here is a checklist to follow when installing or checking a flue 

pipe assembly. It is based on the requirements found in the 

Canadian Standards Association’s Installation Code for Solid 

Fuel Burning Appliances and Equipment (Standard B365).

1)    Single-wall  flue  pipe  assemblies  must  not  exceed                        

3 metres (10’ ) in overall length.

2)   The assembly should be as short and direct as possible.
3)   A single-wall flue pipe assembly must have no more than 

two 90 degree elbows; use 45 degree elbow, wherever 

possible.

4)  Do not use galvanized flue pipe because the coating can 

vaporize at high temperatures, emitting poisonous gases 

and leaving the pipe thin and weak. 

5)   Flue pipes for woodburning appliances need to be thicker 

than  those  used  for  other  fire-burning  appliances;  24 

gauge for 150 mm (6”) .

6)   Joints between pipes should overlap at least 30mm (1 

1/4”).

7)   Each joint should be secured with three sheet metal 

screws.

8)  The assembly should be constructed to allow for 

expansion. Elbows in an assembly allow it to expand; 

straight flue pipe assemblies should have one section left 

unscrewed and secured with an inspection wrap clamped 

around the joint.

9)   The pipes should slope up towards the chimney at least 

20 mm/metre (1/4 in/ft).

10)  One  end  of  the  flue  pipe  assembly  must  be  securely 

fastened to the flue collar of the appliance and the other 

end fastened to the chimney.

11) There must be provision for the cleaning and inspection 

of the pipes by removal of the pipe. The removal of the 

pipes should not require moving the appliance.

12) The crimped ends of the pipes should point towards the 

appliance so that condensation drains to the appliance 

and does not leak out.

13)  A flue pipe must never pass through a combustible floor 

or ceiling, or through a concealed attic, roof space, or 

closet.

Flue pipe assemblies should be stable and secure. To check 

the stability of a flue pipe assembly, grasp it at its mid-point 

and give it a good shake. If it is properly constructed, it will 

have little or no movement. 

Masonry chimneys should be checked for deterioration 

including damaged bricks, crumbling and missing mortar, 

cracks in the drip cap at the top of the chimney, and loose 

flashings at the roof line. The liner should be checked for 

cracks and misalignment, and its size should be 6” (15.24 cm).

An existing factory-built metal chimney needs a careful 

inspection. Your new cookstove should be connected only 

to  factory-built chimneys approved to ULC Standard S629 in 

Canada and UL 103HT in the U.S

.  Possible problems with 

an older metal chimney can include a warped or buckled 

liner caused by the heat of a chimney fire, corrosion of the 

outer shell, a loose flashing, and a lack of proper support. 

Any discolouration of the metal shell near a joint indicates 

that the insulation has settled. A damaged metal chimney 

should be replaced with a new approved chimney which will 

be safer and will perform better.

What To Do If You Have a Chimney Fire

1)   Close all the combustion air dampers on the appliance.
2)   Call the fire department immediately.
3)   Be prepared to get everyone out of the house in case 

the fire spreads.

4)   Go outside and check to see that hot ashes do not ignite 

shingles.

5)   Watch anything near the chimney that could catch fire 

and burn.

6)   After the fire has run its course and the chimney has 

cooled, have the chimney thoroughly inspected to 

7)   Resolve to inspect and clean the chimney more often to 

prevent another chimney fire.

Flue pipes carry the exhaust gases from the appliance flue 

collar to the chimney. The flue pipe assembly is an extremely 

important part of a woodburning systems and should be 

carefully planned and installed.