Cleaver-Brooks ClearFire CFLC-5000 - Page 55

Section 3 — Stack and Intake Vent Sizing and Installation
Part No. 750-363 3-17
Table 3-2. CFLC Combustion Air and Flue Venting Requirements for Individual Boiler Venting
20ppm NOx Combustion air
SCFM
Minimum duct
diameter inches
Max allowable
comb. air pressure
drop (inches WC)
Direct vent
adapter kit
options
Flue diameter Draft tolerance
(inches WC)
CFLC 4000 1000 10 0.25 10” or 12” 14” -0.25/+0.10”
CFLC 5000 1250 12 0.25 12” 14” -0.25/+0.10”
CFLC 6000 1500 14 0.25 14” or 16” 16” -0.25/+0.10”
CFLC 8000 2000 14 0.25 14” or 16” 16” -0.25/+0.10”
CFLC 10000 2500 16 0.50 16” or 18” 20” -0.25/+0.10”
CFLC 12000 3000 18 0.50 18” 20” -0.25/+0.10”
9ppm NOx
CFLC 4000 1075 10 0.25 10” or 12” 14” -0.25/+0.10”
CFLC 5000 1350 12 0.25 12” 14” -0.25/+0.10”
CFLC 6000 1625 14 0.25 14” or 16” 16” -0.25/+0.10”
CFLC 8000 2150 16 0.25 14” or 16” 16” -0.25/+0.10”
CFLC 10000 2700 16 0.50 16” or 18” 20” -0.25/+0.10”
CFLC 12000 3225 18 0.50 18” 20” -0.25/+0.10”