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Lennox International Inc. TUA125S Benutzerhandbuch

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Page 10
 
F-Horizontal Venting-Residential Two Pipes 
  1-For horizontal residential installations these units are 
certified as Category I appliances. The vent may be 
single wall material minimum 25 GSG (0.46mm) 
galvanized steel or equivalent grade stainless steel or 
a single section of type B-1 vent installed according to 
the sections Venting  A-General Recommendations 
and Requirements and  C-Horizontal Venting 
General and F-Horizontal Venting–Residential Two 
Pipes. Refer to figure 6. 
 
 
2-The vent pipe diameter for horizontal residential 
installations shall be 4” (100mm) on 45 units and 5” 
(127mm) on 60/75/100/125 units. Refer to table 4 for 
vent diameter and termination requirements. 
  3-The maximum vent length is 5’ (1.5m) plus one 90-
degree elbow. 
  4-The vent must maintain a ¼” rise per foot of slope 
upwards toward the termination 
 
TABLE 4 
HORIZONTAL VENT REQUIREMENTS 
 
FLUE TYPE 
FLUE DIA. VENT 
CAP 
MODEL INSTALLATION 
AIR INLET TYPE 
INLET AIR 
DIA. 
INLET AIR CAP 
MAX. VENT 
LENGTH (MIN. 
VENT LENGTH 3’) 
SINGLE WALL 
4” 
TEE or 
4” BELMONT 
45 RESIDENTIAL 
SINGLE WALL PIPE or 
METAL FLEX VENT 
3” TEE 
or 
3” BELMONT 
5’ MAY USE ONE 
SECTION OF  
B-VENT 
CONCENTRIC 4” 
45 RESIDENTIAL 
SINGLE WALL PIPE or 
METAL FLEX VENT 
3” 
4” CONCENTRIC  
VENT/ ADAPTER/CAP  
KIT REQUIRED 
5’ 
SINGLE WALL 
3” 
TEE or 
3” BELMONT 
45 COMMERCIAL 
SINGLE WALL PIPE or 
METAL FLEX VENT 
3” TEE 
or 
3” BELMONT 
25’ MAY USE ONE 
SECTION OF  
B-VENT  
CONCENTRIC 3” 
45 COMMERCIAL 
SINGLE WALL PIPE or 
METAL FLEX VENT 
3” 
4” CONCENTRIC  
VENT/ ADAPTER/CAP  
KIT REQUIRED 
25’ 
SINGLE WALL 
5” 
TEE or 
5” BELMONT 
60, 75 
RESIDENTIAL 
SINGLE WALL PIPE or 
METAL FLEX VENT 
4” TEE 
or 
4” BELMONT 
5’ MAY USE ONE 
SECTION OF  
B-VENT 
CONCENTRIC 4” 
60, 75 
RESIDENTIAL 
SINGLE WALL PIPE or 
METAL FLEX VENT 
4” 
4” CONCENTRIC  
VENT/ ADAPTER/CAP  
KIT REQUIRED 
5’ 
SINGLE WALL 
4” 
TEE or 
4” BELMONT 
60, 75 
COMMERCIAL 
SINGLE WALL PIPE or 
METAL FLEX VENT 
4” TEE 
or 
4” BELMONT 
25’ MAY USE ONE 
SECTION OF B-
VENT  
CONCENTRIC 4” 
60, 75 
COMMERCIAL 
SINGLE WALL PIPE or 
METAL FLEX VENT 
4” 
4” CONCENTRIC  
VENT/ ADAPTER/CAP  
KIT REQUIRED 
25’ 
SINGLE WALL 
5” 
TEE or 
5” BELMONT 
100, 125 
RESIDENTIAL 
SINGLE WALL PIPE or 
METAL FLEX VENT 
4” TEE 
or 
4” BELMONT 
5’ MAY USE ONE 
SECTION OF  
B-VENT 
SINGLE WALL 
5”  
TEE or 
5” BELMONT 
100, 125 
COMMERCIAL 
SINGLE WALL PIPE or 
METAL FLEX VENT 
4” TEE 
or 
4” BELMONT 
5’ MAY USE ONE 
SECTION OF  
B-VENT