# Field Controls -Vent Riser™

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**Sub-grade Venting Just Got Easier!**

For basement installations where a window well must be used, or in installations where the vent terminal cannot be mounted to maintain a minimum 12” clearance above grade, use a Field Vent Riser™

**Category: **basement vent pipes | chimney | chimneys...

**MasterFormat: **Central Heating Equipment | Breechings, Chimneys, and Stacks | Fabricated Stacks...

Field Controls

2630 Airport Road

Kinston, NC 28504

Tel: (252) 522-3031

Fax: (252) 522-0214

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**Related Products**

Overview

# Vent Riser™

**Sub-grade Venting Just Got Easier!**

For basement installations where a window well must be used, or in installations where the vent terminal cannot be mounted to maintain a minimum 12” clearance above grade, use a Field Vent Riser™

**Features**

- Ensures the vent termination is above grade and in compliance with codes
- Perfect for basement installations where a window well must be used or when a vent terminal cannot be mounted to maintain a minimum 12''' clearance above grade
- Stainless steel construction
- Combustion air connection rotates 360 degrees for easier installation

**How to determine total equivalent feet**

- Determine the total equivalent feet for each type of fitting used in the venting system from Tables 1 and 2.
- Calculate the total feet for the straight lengths of pipe.
- Add the equivalent feet of the fittings to the total amount of feet of straight length pipe. This will approximate the total equivalent feet of the vent system.
- Find your total equivalent feet in Table 3 to determine the proper model for your installation.

**Example: System Pipe Size= 6"**

- Step 1 2-90 degrees Elbows (6")= 22 Ft.
- Step 2 10-2 Ft. Lengths of 6" Pipe = 20 Ft.
- Step 3 6" to 4" reducer= 4 Ft.
- Step 4 Total Equivalent Feet= 22 Ft. + 20 Ft. + 4 Ft. = 46 Ft.

Specifications

Model | A | B | C | D | E | F | G | H |

CV-4VR | 42 1/16" | 33 1/2" | 17 3/4" | 9" | 6 3/8" | 44" | 10 1/2" | 12 1/2" |

CV-5VR | 42 1/16" | 32 1/4" | 20 3/8" | 9 5/8" | 6 7/8" | 44" | 10" | 12 7/8" |

Model | Volts | Hz | Amps | Watts | RPM | Thermal Protection |

CV-4VR | 115 | 60 | 1.7 | 138 | 3000 | YES |

CV-5VR | 115 | 60 | 1.3 | 144 | 3100 | YES |

VENT PIPE FITTINGS | VENT PIPE DIAMETER | VENT PIPE DIAMETER | VENT PIPE DIAMETER | VENT PIPE DIAMETER |

4" | 5" | 6" | 7" | |

Tee | 25 | 31 | 38 | 44 |

Y-Connection | 13 | 16 | 20 | 23 |

90 Elbow | 7 | 9 | 11 | 12 |

45 Elbow | 4 | 4 | 5 | 6 |

PIPE SIZE | PIPE SIZE | PIPE SIZE | PIPE SIZE | PIPE SIZE | PIPE SIZE | PIPE SIZE | PIPE SIZE | PIPE SIZE | PIPE SIZE | PIPE SIZE |

Large | Small | Small | Small | Small | Small | Small | Small | Small | Small | Small |

4" | 5" | |||||||||

4" | 0 | - | ||||||||

5" | 2 | 0 | ||||||||

6" | 4 | 2 | ||||||||

7" | 5 | 4 | ||||||||

To estimate the equivalent foot length of the Reducer/Increaser chart, find the figure at the intersection of the small pipe size and the large pipe size. | To estimate the equivalent foot length of the Reducer/Increaser chart, find the figure at the intersection of the small pipe size and the large pipe size. | To estimate the equivalent foot length of the Reducer/Increaser chart, find the figure at the intersection of the small pipe size and the large pipe size. |

MODEL | MAX* OIL GPH INPUT 100psi | MAX* OIL GPH INPUT 140psi | MAX** GAS BTU/hr. INPUT | AT MAX GPH INPUT | AT 60% OF MAX GPH INPUT | COMBUSTION AIR OPTION | VENT PIPE SIZE |

CV-4VR | 1.10 | .90 | 170,000 | 18 | 83 | yes*** | 4" |

48 | 100 | 5" | |||||

100 | 100 | 6" | |||||

100 | 100 | 7" | |||||

CV-5VR | 1.85 | 1.55 | 290,000 | - | 25 | yes*** | 4" |

32 | 81 | 5" | |||||

76 | 100 | 6" | |||||

100 | 100 | 7" | |||||

* Oil: Select vent riser according to the actual rated maximum GPH input. ComboVent GPH ratings at 100 psi. Do not exceed maximum oil GPH input. ** Gas: Do not exceed maximum BTU/hr. input rating. For multiple venting system applications add the input for each appliance. Category I gas-fired draft induced systems require an CV-4 or larger. Category III gas-fired draft induced systems require a CV-5 or larger. Unit sizing may vary depending on specific application. Consult your dealer or factory representative for the proper sizing for your particular application. *** Do not use combustion air intake when using gas. | * Oil: Select vent riser according to the actual rated maximum GPH input. ComboVent GPH ratings at 100 psi. Do not exceed maximum oil GPH input. ** Gas: Do not exceed maximum BTU/hr. input rating. For multiple venting system applications add the input for each appliance. Category I gas-fired draft induced systems require an CV-4 or larger. Category III gas-fired draft induced systems require a CV-5 or larger. Unit sizing may vary depending on specific application. Consult your dealer or factory representative for the proper sizing for your particular application. *** Do not use combustion air intake when using gas. | * Oil: Select vent riser according to the actual rated maximum GPH input. ComboVent GPH ratings at 100 psi. Do not exceed maximum oil GPH input. ** Gas: Do not exceed maximum BTU/hr. input rating. For multiple venting system applications add the input for each appliance. Category I gas-fired draft induced systems require an CV-4 or larger. Category III gas-fired draft induced systems require a CV-5 or larger. Unit sizing may vary depending on specific application. Consult your dealer or factory representative for the proper sizing for your particular application. *** Do not use combustion air intake when using gas. | |||||

Note: In Table 3, the maximum equivalent footage allowable for the vent pipe is given for two points, the maximum GPH venting capacity and at 60% of the maximum. This allows for estimating values between the two given points. | Note: In Table 3, the maximum equivalent footage allowable for the vent pipe is given for two points, the maximum GPH venting capacity and at 60% of the maximum. This allows for estimating values between the two given points. | Note: In Table 3, the maximum equivalent footage allowable for the vent pipe is given for two points, the maximum GPH venting capacity and at 60% of the maximum. This allows for estimating values between the two given points. |