MONTIGO BVK35 Kit Direct Vent Adapter to 5 Inch B-Vent Installation Guide

MONTIGO BVK35 Kit Direct Vent Adapter to 5 Inch B-Vent

Product Information

The BVK35 Kit is an adapter designed to convert direct vent models such as DRL3613NI, DRL4813NI, DRL6013NI, DRSQ34NI, and DRSQ38NI to 5 B-vent systems. The kit is applicable for top vented applications only and replaces the vent run requirements referenced in the fireplace instruction manuals. It contains 3-inch aluminum flex liners that must be enclosed within the existing B-vent. The BVK35 has no effect on any other aspect of appliance installation and can only be installed by a qualified installer, service agency or gas fitter.

Parts Included:

• 3-inch aluminum flex liners
• B-vent adapter
• Installation instructions

Warnings:

Failure to follow safety warnings exactly could result in serious injury, death, or property damage. Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. Some materials used in the manufacturing process of this product can expose you to Benzene which is known in the State of California to cause cancer and birth defects or other reproductive harm.

Product Usage Instructions

Before installation, check local codes and read all instructions carefully. The installation and service must be performed by a qualified installer, service agency or gas fitter.

Preparation:

1. Ensure the existing vent is well supported and no screws will penetrate the aluminum liner.
2. Remove the existing B-vent cap and determine the total length of the vent and whether there are offsets using a weighted line. This should be done before starting any destructive work to ensure that installation is feasible.

Installation:

1. Cut the B-vent before removing the fireplace to prevent damaging the vent and supports.
2. Remove the existing appliance once the liner installation has been verified with the minimum/maximum vent run table.
3. Install the BVK35 Kit using the following steps:
   • Completely enclose the 3-inch aluminum flex liners within the existing B-vent.
   • Extend the existing B-vent to the adapter location where required using flex or rigid 4/7 direct vent.
   • Replace the existing B-vent system with the approved adapter packaged with the BVK35 Kit.

After installation, retain this manual for future reference and refer to the Montego website for the most current version of the fireplace manual.

WARNING:

FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly could result in serious injury, death, or property damage

• Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
• WHAT TO DO IF YOU SMELL GAS
  • Do not try to light any appliance.
  • Do not touch any electrical switch; do not use any phone in your building.
  • Leave the building immediately.
  • Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions.
  • If you cannot reach your gas supplier, call the fire department.
• Installation and service must be performed by a qualified installer, service agency or gas fitter.

Listed direct vent appliances can be installed on the existing 5″ Certified B-Vent system by using the BVK35 kit and inserting a 3″ aluminum flex liner within the B-vent and utilizing the space between the flex and B-Vent for combustion air.
The BVK35 kit and listed fireplace models could also be connected to the existing 6″ Certified B-Vent system by using a Certified 5″ to 6″ B-Vent increaser (not provided with the BVK35 kit).
The BVK35 kit is approved for use with the following NG models only: DRL36, DRL48, DRL60, DRSQ34, and DRSQ38. LP CONVERSION IS NOT ALLOWED WHEN RETROFITTING INTO EXISTING B-VENT.

CAUTION

Installation and service must be performed by a qualified installer, service agency or gas fitter. Check local codes and read all instructions prior to installation.

NOTICE

• Installer : Leave this manual with the appliance. Please refer to the Montego website for the most current version of the fireplace manual
• Consumer : Retain this manual for future reference. Please refer to the Montego website for the most current version of the fireplace manual

WARNING

Some materials used in the manufacturing process of this product can expose you to Benzene which is known in the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65warnings.ca.gov

The dimensions of the appliance and the clearances to combustibles are listed in the installation manuals packaged with the appliance. Venting must terminate through the roof, no side venting allowable. 4″x7″ coaxial vent rigid or flex pipe can be used to extend from top of fireplace to Lower B-Vent adapter attached to existing B-Vent. If 4″x 7″ flex pipe is used then existing B-Vent must be properly strapped to support its weight.

INSTALLERS’ RESPONSIBILITIES BEFORE AND AFTER CONVERSION TO DIRECT VENT COMPLETED:

• Inspect existing B-Vent configuration allows installation of 3″ flex liner without damage to the existing vent system.
• Inspect existing B-Vent is damage free and adequately supported.
• Confirm existing B-Vent has minimum l” clearance to combustible materials through all vent length.
• Confirm existing venting dual wall pipe, not single wall pipe.
• Direct vent fireplace is installed as prescribed in the installation manual packaged with the fireplace

Overview

NOTICE

Rear venting not permitted with the use of this kit, only use with top vented applications.

Parts included

• Duravent 5″ B-Vent to DV conversion Lower and Upper adapter kit BVA35
• Duravent – Montigo collar adapter46DVA-AD-M1
• 4/7 Male vent connector
• MVA Conversion label

Parts NOT included

• Certified two ply 3″ flex liner

• Sealants and foil tape, screws

• Roof termination,
  Duravent 46DVA-VCH (recommended) or equivalent

• Certified 4/7″ flex section (optional)

The BVK35 Kit uses the below vent run requirements which replace the ones referenced in the fireplace instruction manuals

Aside from the venting and restrictor settings, the BVK35 has no effect on any other aspect of appliance installation.
The listed direct vent models may only be installed onto B-vent systems using approved adapters packaged with this kit and following these instructions. Completely enclose the 3-inch aluminum flex liners within the existing B-vent.
DO NOT USE SINGLE WALL B VENT.

Preparation

1. Ensure the existing vent is well supported and no screws will penetrate the aluminum liner.
2. The existing B-vent cap should be removed and discarded, using a weighted line, to determine the total length of the vent and whether there are offsets. It is important to do this before starting any destructive work. In order to ensure that installation is feasible, it may be preferable to do this before removing the existing appliance. Once the liner installation has been verified with the minimum/maximum vent run table, the existing appliance can be removed.
3. Ensure that the lower portion of the existing B-vent is not damaged as you remove the existing appliance.

Installation

BASIC CONNECTION
The fireplace flue aligns with the existing B-Vent and there is enough existing B-Vent length to slide over the fireplace. Mostly short, vertical (no offsets) B-Vent runs where existing B-Vent has some slack to slightly lift it and slide fireplace under it.

EXTENDED CONNECTION
Similar to scenario connection A but the existing B-vent needs to be extended to reach the new fireplace. Montigo MEXT (EXT18 can be used for short extensions) shall be used to extend to B-Vent

EXTENDED FLEX CONNECTION
The fireplace flue does not align with the existing B-Vent and/or the existing B-Vent does not have slack to lift it and slide the fireplace under it. Mostly long B-Vent runs with 45° offsets. Recommended flex: Montigo MFL, Duravent 46DVA-FO (collarless), Flexmaster 4DVKIT47 or equivalent certified true size 4/7 dual ply.

• Go to the roof and slide continuous 3” 2 ply certified flex pipe down the center of certified B-Vent pipe. Note: no 3” flex liner joints are allowed except where its secured to lower and upper BVA35 adapters.
• Go back down to the fireplace and make sure the flex liner is protruding from the bottom of the B-Vent pipe. Apply a thin continuous bead of Mill-Pack sealant on the lower adapter flue collar and fasten the 3” aluminum liner to the flue collar using sheet metal screws, make sure the screws punctured the adapters flue collar and tightened flex liner to it. Mount Montigo to Duravent adapter 46DVA-AD-M1 to lower
• Vent adapter, twist to lock. Mount 46DVA-AD-M1 adapter over fireplace collar or rigid pipe extension, seal inner joints with Mill-Pack and outer joints with aluminum foil tape. If flex coaxial pipes are used as an extension, use the MVA male adapter (provided with the kit) to connect flex pipe to the 46DVA-AD-M1 adapter. Use sheet metal screws to secure MVA to flex pipe, seal inner joints with Mill-Pack and outer joints with aluminum foil tape.
• Continue with the installation of the fireplace, following instructions packaged with the fireplace. Make sure all clearances to combustible materials are met per the fireplace installation manual.
• Go back to the roof and install the upper adapter. Gently pull the 3” aluminum liner and cut off any excess. Apply a thin continuous bead of Mill-Pack sealant on the upper adapter flue collar and fasten the 3” aluminum liner to the flue collar using sheet metal screws, make sure the screws punctured the adapters flue collar and tightened flex liner to it.
• Slide upper adapter over B-Vent, seal the outer seams with high-temperature silicone. Push Duravent 46DVA-VCH (or equivalent direct vent vertical termination cap) termination cap over the upper B-Vent adapter and twist to lock, and seal the outer joint with high-temperature silicone. Apply the conversion label (supplied with kit) to the other side of the fireplace rating plate plaque over the existing NG/LP conversion label.

Flue restrictors

Flue restrictors (if equipped) are to be adjusted in field depending on the flame quality and vent length. Units that do not come standard with a restrictor can use the optional FRK3 restrictor kit.

FRK3 restrictor use in DRL units:

• Grab the desired width restrictor plate
• Bend restrictor plate as shown
• Slide over the fireplace flue opening and secure it with self-taping screws

Finishing
Do not close in and finish the chase before the correct flame pattern and combustion has been established. All other finishing instructions can be found in the manual for the fireplace.

DIRECT VENT ADAPTER TO 5” B-VENT

Applicable for:

• DRL3613NI / DRL3613NI-2
• DRL4813NI / DRL4813NI-2
• DRL6013NI / DRL6013NI-2
• DRSQ34NI / DRSQ34NI-2
• DRSQ38NI / DRSQ38NI-2

References

• P65warnings.ca.gov

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