Froling P4 - Barometric Damper; Basic Boiler Data for Layout of Chimney System

Page 18
B0430207 I
2
minimum of ¼” per foot of run toward the chimney. Smoke pipe
sections must be attached to one another with a minimum of three
sheet metal screws and sealed with hi-temperature silicone. The smoke
pipe should not contain more than two 90° elbows (45° elbows are
preferred over 90° elbows).
The chimney draft must be stable (see chart below “Basic Boiler Data for
Layout of Chimney system”.
The top of the chimney must be 3 feet (0.9 m) above the roof and 2 feet
(0.6 m) above any structure within 10 feet (3.0 m) measured
horizontally.
Barometric Damper
 We recommend that you install a barometric damper. 1
 Install the barometric damper directly under the mouth of the flue
line, as there is always low pressure there. 1
Basic Boiler Data for Layout of Chimney system
P4 Pellet
Description
Unit
8
15
20
25
32
38
48
60
80
100
Flue gas temperature
ºF
284
300
300
300
320
320
320
338
320
338
Flue gas mass flow RL
PL
lb/hr
lb/hr
55
24
79
33
115
44
143
55
172
70
203
90
309
132
342
154
474
165
606
209
Required Draft RL
PL
inch
WC
0.03
0.02
0.03
0.02
0.03
0.02
0.03
0.02
0.03
0.02
0.03
0.02
0.03
0.02
0.03
0.02
.032
.024
.032
.024
Flue pipe diameter
inches
5
5
5
5
6
6
6
6
8
8
NL = Nominal Load, PL = Partial Load