Stack Sizing; Stack Design Using Room Air For Combustion - CleaverBrooks CFC Operation, Service & Parts Manual

Section 3 — Stack and Intake Vent Sizing and Installation
Table 3-1 STACK DESIGN (SINGLE BOILER) USING ROOM AIR
Boiler Stack/Flue
Boiler
Connection
CFC 500 6" Standard
CFC 750 6" Standard
CFC1000 6" Option
CFC1000 8" Standard
CFC1000 10" Option
CFC1500 8" Option
CFC1500 10" Standard
CFC1500 12" Option
CFC1800 10" Option
CFC1800 12" Standard
CFC 2500 12" Standard
CFC3300 12" Standard
CFC3300 14" Option
* 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.
3-10
F. STACK SIZING

1. Stack design using room air for combustion

Boiler Maximum length of
Flue/Stack Flue Gas Vent in
Size Feet*
6" 80
6" 60
6" 80
8" 140
10" 200
8" 60
10" 80
12" 120
10" 60
12" 100
12" 110
12" 60
14" 110
Room
Flue Connection
Combustion Air
Part No.
Required (CFM)
039-01704 125
039-01704 190
039-01646 250
039-01647 250
039-01705 250
039-01645 375
375
039-01644
039-01688 375
039-01644 450
039-01688 450
039-01688 625
039-01761 800
039-01762 800
Air Filter Kit No.
(optional)
880-01858
880-01858
880-01858
880-01858
880-01858
880-02005
880-02005
880-02005
880-02005
880-02005
880-02005
880-02502
880-02502
Part No. 750-263