CleaverBrooks CFC ClearFire User Manual

Model CFC ClearFire Commercial Boilers
61 Rev. 05-2012
Table B5-26. STACK SIZING USING OUTSIDE AIR FOR COMBUSTION (DIRECT VENT COMBUSTION)
DIRECT VENT COMBUSTION AIR -- MAXIMUM ALLOWABLE VENTING LENGT
H
Boiler
Boiler Stack/Flue
Connection
Combustion Air
Intake Duct &
Connection
Boiler
Flue/Stack
Size
Maximum length of
Flue Gas Vent in
Feet*
Maximum length of
Air Intake Duct in
Feet**
Direct Vent
Combustion Air Kit
Flue Connection
Part No.
CFC 500 6" Standard 4" 6" 75 75 880-01312 039-01704
CFC 500 6" Standard 6" 6" 80 80 880-03736 039-01704
CFC750 6" Standard 4" 6" 40 40 880-01312 039-01704
CFC 750 6" Standard 6" 6" 50 50 880-03736 039-01704
CFC1000 6" Option 4" 6" 30 30 880-01312 039-01646
CFC1000 6" Option 6" 6" 40 40 880-03736 039-01646
CFC1000 8" Standard 4" 8" 50 50 880-01312 039-01647
CFC1000 8" Standard 6" 8" 60 60 880-03736 039-01647
CFC1000 10" Option 4" 10" 70 70 880-01312 039-01705
CFC1000 10" Option 6" 10" 80 80 880-03736 039-01705
CFC1500 8" Option 6" 8" 30 30 880-01313 039-01645
CFC1500 8" Option 8" 8" 40 40 880-02451 039-01645
CFC1500 10" Standard 6" 10" 40 40 880-01313 039-01644
CFC1500 10" Standard 8" 10" 60 60 880-02451 039-01644
CFC1500 12" Option 6" 12" 60 60 880-01313 039-01688
CFC1500 12" Option 8" 12" 80 80 880-02451 039-01688
CFC1800 10" Option 6" 10" 40 40 880-01313 039-01644
CFC1800 10" Option 8" 10" 55 55 880-02451 039-01644
CFC1800 12" Standard 6" 12" 50 50 880-01313 039-01688
CFC1800 12" Standard 8" 12" 80 80 880-02451 039-01688
CFC 2500 12" Standard 8" 12" 100 100 880-02451 039-01688
CFC3300 12" Standard 8" 12" 55 55 880-02501 039-01761
CFC3300 14" Option 8" 14" 100 100 880-02501 039-01762
* Each additional 90 elbow equals 5 equivalent feet of ductwork. Flue terminations may add 5-10 feet
to the equivalent length and should also be included in the equivalent length calculation.
** Increasing the diameter of the air intake will reduce the overall pressure drop and thereby allow
longer total vent lengths.
Draft tolerance at boiler flue connection during operation is +/- 0.25” WC.

CleaverBrooks CFC ClearFire Specifications

General

Brand	CleaverBrooks
Model	CFC ClearFire
Category	Boiler
Language	English