Lochinvar EcoForce EF80 Installation, Commissioning, User And Maintenance Instructions page 36

100mm flue pipe
Item
Straight tube (m)
45° Elbow
90° Elbow
Concentric Vertical terminal
8.8.6 Worked example – twin-pipe flue
110mm flue and air inlet pipe
Flue exhaust
Air Inlet
Quantity
Flue Resistance Calculation Example
EXAMPLE EF120 WATER HEATER
FLUE EXHAUST
7000mm VERTICAL FLUE LENGTH
2000mm HORIZONTAL FLUE LENGTH
2X 90° BEND
1X CONCENTRIC FLUE TERMINAL
AIR INLET
6000mm VERTICAL LENGTH
2000mm HORIZONTAL LENGTH
2X 90° BEND
1X AIR INLET
Item
Straight tube (m)
45° Elbow
90° Elbow
Concentric Vertical terminal
Item
Straight tube (m)
45° Elbow
90° Elbow
Air Inlet
13
2
1
1
Total Resistance 146<200 FLUE SYSTEM DESIGN HAS PASSED
Quantity
9
0
2
1
Quantity
8
0
2
1
Total Resistance= 93.6+56.7 = 150.3<200 FLUE SYSTEM DESIGN HAS PASSED
Resistance
4.0
2.0
4.0
86.0
Total Resistance (Pa)
Resistance
6.5
6.5
22.1
Total Resistance (Pa)
Resistance
4
4
16.7
Total Resistance (Pa)
Total
52.0
4.0
4.0
86.0
146
Total
58.5
0
13
22.1
93.6
Total
32
0
8
16.7
56.7
36