Specification

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Combustion
Combustion Air Systems
VRV - Vacuum
Relief Valve
Inta
k
e
Air Hood
4"
F urnace/Boiler
F urnace
Boot
™
with Te lescopic Featur e
(Allows units to fit any furnace cabinet)
Field AirBoot
®
or Bi
g
Boot
®
Burner Inle t
Field AirBoot
®
CAS-1 and CAS-2 (Oil)
Direct Connect
The CAS-1 and CAS-2 Field Combustion Air Systems provide
controlled amounts of outside air for proper combustion of oil
heating appliances. These models are designed specifically for
use with Aero, Beckett, Carlin, Riello, or Wayne burners.
Intake Air Hood
Vacuum Relief
Valve (VRV)
Longer intake air runs require the use of larger diameter
pipe between the VRV and the Intake Air Hood. Use a pipe
increaser at the VRV and a reducer at the Intake Air Hood.
FurnaceBoot™
CAS-2 Series
AirBoot
®
/
FurnaceBoot™
Pipe Diameter Maximum Linear Feet Feet/Elbow
4" 44' 7'
5" 60' 9'
6" 90' 11'
Model Fuel Burner
Appliance
Input
Components
CAS-1
Oil
Beckett AFII, NX,
Riello 40BF
Up to 2 gph
4" Intake Air Hood
4" Vacuum Relief Valve
CAS-2B
CAS-2C
CAS-2W
Oil
Beckett AFG or AF,
Carlin EZ-1, CRD,
FRD, Wayne MSR
Up to 2 gph
4" Intake Air Hood
4" Vacuum Relief Valve
Field AirBoot
®
CAS-2B-90E
Oil
Beckett AF and
AFG, warm air
furnaces
Up to 1.5 gph
4" Intake Air Hood
4" Vacuum Relief Valve
FurnaceBoot™
ComboVent™
Power Venter
The ComboVent combines combustion air
connection and venting in one, convenient,
easy-to-install package. For more information
and details, refer to the Venting section.
When to use the CAS
• Too tight construction
• Provide source of fresh air for combustion
• CAS-1 and CAS-2 connect directly to oil burners
• CAS-3, CAS-4, CAS-6 and CAS-7 are for multiple
appliances or when direct connection is not possible
Equivalent Feet for Vent Pipe Fitting
Vent Pipe
Fittings
Vent Pipe Diameter
3" 4" 5" 6" 7" 8" 9" 10" 12" 14"
Tee
19 25 31 38 44 50 56 63 75 89
Y-Connection
10 13 16 20 23 26 29 32 39 45
90° Elbow
5 7 9 11 12 14 16 18 21 25
45° Elbow
3 4 4 5 6 7 8 9 10 13