Field Controls - Fan-in-a-Can®: CAS-3 (Oil) and CAS-4 (Gas)

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The Fan-in-a-Can® diffuses the outside air into the room near the burner to ensure adequate air for efficient combustion.

Category: chimney | combustion air intake | combustion air intake components...

MasterFormat: Central Heating Equipment | Breechings, Chimneys, and Stacks



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Overview


Fan-in-a-Can®: CAS-3 (Oil) and CAS-4 (Gas)

The Fan-in-a-Can® diffuses the outside air into the room near the burner to ensure adequate air for efficient combustion.

The CAS-3 and CAS-4 models are designed to provide combustion air for appliances when direct connection to the burner is not possible (when the appliance is located in a confined space). According to NFPA 54 and NFPA 31, an engineered system such as a CAS-3, 4, 6 or 7 may be used to overcome the lack of air in a confined space. The CAS-4MV is for use with 750mV power pile gas appliances. Each is designed for optimum safety and includes a proving device that won’t allow the burner to engage without the Fan-in-a-Can® operating. Multiple units or additional controls are required for multiple appliance installations. Each is equipped with a two speed control for enhanced versatility.


How the CAS-3 and CAS-4 Work

When the thermostat calls for heat, the Fan-in-a-Can® engages and begins drawing air into the structure. When air flow is established, the pressure switch closes. The CAS sends a signal to the appliance, allowing the burner to fire. The Fan-in-a-Can® diffuses the outside air into the room near the burner to ensure adequate air for efficient combustion.


CAS-4Jr.

The Fan-in-a-Can, Jr. is designed for gas appliances up to 110,000 BTU/hr input. A 4 intake Air Hood (IAH) is included along with mounting brackets to secure the Fan-in-a-Can, Jr. to a wall. It may be used with a residential water heater with the addition of control kit CK-20 FV/FG.


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Specifications

Model Fuel Application Appliance Input Components
CAS-3 Oil

Any oil heating

appliance 120V

See Specifications

4" Intake Air Hood

Fan-in-a-can

6" to 4" Reducer Restrictor Plate

CAS-4 Gas 24V Gas Appliance See Specifications

4" Intake Air Hood

Fan-in-a-can

6" to 4" Reducer

Restrictor Plate

CAS-4MW Gas

750mV Power Pile

Gas Appliance

See Specifications

4" Intake Air Hood

Fan-in-a-can

6" to 4" Reducer

Restrictor Plate

CAS-4P Gas

Boiler with automatic

vent damper

See Specifications

4" Intake Air Hood

Fan-in-a-can

6" to 4" Reducer

Restrictor Plate ADA-1

CAS-4Jr. Gas 24V Gas Appliance See Specifications

4" Intake Air Hood

Fan-in-a-can

Installation Specifications
Total Input of Appliance(s) Total Input of Appliance(s) Max. Equivalent Feet of Installation Max. Equivalent Feet of Installation Max. Equivalent Feet of Installation Max. Equivalent Feet of Installation Max. Equivalent Feet of Installation Max. Equivalent Feet of Installation
CAS-3 OIL CAS-4, 4mV, 4P GAS

4" duct & hood

w/ Restrictor

4" duct & hood

w/ Restrictor

4" duct & 4" hood 4" duct & 4" hood 6" duct & 6" hood 6" duct & 6" hood
(gph) (BTU/hr) HI LOW HI Low HI Low
- 50,000 300 300 300 300 300 300
.50 75,000 300 300 300 300 300 300
.75 100,000 300 300 300 300 300 300
.90 125,000 300 220 300 220 300 300
1.00 150,000 174 108 232 118 300 300
1.25 175,000 99 48 152 63 300 300
1.35 200,000 52 14 102 32 300 300
1.55 225,000 20 N/A 68 13 300 239
1.75 250,000 N/A N/A 45 N/A 300 150
2.00 300,000 N/A N/A 16 N/A 300 53
2.50 350,000 N/A N/A N/A N/A 193 8
2.75 400,000 N/A N/A N/A N/A 109 N/A
3.25 450,000 N/A N/A N/A N/A 56 N/A
Installation Specifications for CAS-4JR.TM
Total Input of Appliance(s) Maximum Equivalent Feet of Duct Pipe Maximum Equivalent Feet of Duct Pipe Maximum Equivalent Feet of Duct Pipe
BTU/hr 4" Pipe 5" Pipe 6" Pipe
50,000 230 300 300
60,000 160 300 300
70,000 105 300 300
80,000 70 214 300
90,000 40 122 300
100,000 25 76 180
110,000 15 46 80
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