Lennox Hearth 1003C Manuale Utente

 

PAGE 10 

CHIMNEY INSPECTION 
Existing chimneys must be inspected before installing 
your stove. Consult your local building department for 
chimney code requirements. A masonry chimney must 
have a code approved liner. This liner must not have bro-
ken or missing pieces. Some non-code masonry chim-
neys may be brought up to code by being relined. (Con-
sult your dealer or qualified chimney sweep). Factory 
built chimneys should also be inspected, first for creo-
sote deposits (which should be removed), and then for 
integrity of the stainless steel liner. Look for obvious 
bulges in the lining, which may indicate the need to re-
place that section (use a bright flashlight).  
 
Also, inspect the attic to see that the chimney has proper 
clearance to combustible framing members. For interior 
masonry chimneys and most factory-built chimneys, this 
must be a 2“ (51 mm) air space clearance, which must 
not be filled with insulation or any other material. An ex-
terior masonry chimney must have a 1“ (25.4 mm) air 
space clearance. 
 
Vapor Barrier At Chimney Penetration 
Install all venting components per the Vent Manufactur-
ers installation instructions. Ensure that there is an effec-
tive vapor barrier at the location where the chimney 
penetrates to the exterior of the structure. This can be 
accomplished by applying a non-hardening waterproof 
sealant to the following components: 
 
•  Around the chimney at the point where the storm 

collar will meet the chimney just above the Flashing.  

•  Along the vertical seam of the chimney pipe, where it 

is exposed to the weather.  

•  On each nail head on the flashing.  
•  Around the chimney at the point where the storm 

collar will meet the chimney just above the flashing.  

 
Notes:  
•  On a flat or tarred and graveled roof, nail and seal 

the flat roof flashing to the roof on all sides with roof-
ing compound. 

•  Do not put screws through the flashing into the chim-

ney pipe. 

 

CHIMNEY HEIGHT REQUIREMENTS 

The chimney must extend 3 feet (914 mm) above the level 

of roof penetration and a minimum of 2 feet (610 mm) 

higher than any roof surface within 10 feet (305 cm) (see 

below). Check with your local building officials for any addi-

tional requirements for your area. 

 

Due to prevailing winds, local terrain, adjacent tall trees, a 

hill, or ravine near the home, or adjacent structures, addi-

tional chimney height or a special chimney cap may be re-

quired to ensure optimum performance. 

 

 

 

 

 

 

For Manufactured (Mobile) Homes Only:  Portions of 

the chimney and termination that exceed an elevation of 

13½ feet above ground level may be designed to be re-

moved for transporting the manufactured (mobile) home.