Fireplace and Hearth Dimensions, Model | Monessen Hearth NB18, NB24

FIREPLACE AND HEARTH DIMENSIONS

WARNING

This appliance is for installation only in a solid-fuel burning masonry or UL127 factory- built ﬁreplace, vent free appliance, or in listed ventless ﬁrebox enclosure. It has been design certiﬁed for these installations.

Exception: DO NOT install this appliance in a factory-built ﬁreplace that includes instructions stating it has not been tested or should not be used with unvented gas logs.

Use manufacturer's installation and clearance requirements as deﬁned in their manual.

The NB Series unvented room heater is approved for installation into the following unvented fireplaces:

GCUF Series Fireboxes Magnum36/42, Lo-Rider36 or BUF

The NB Series unvented room heater may also be installed into a Ventless Firebox Enclosure for Gas Fired Decorative Type Unvented Room Heaters per IAS Requirement No. 2-97 ANSI Z21.91-2001 (typically referred to as a "Universal Firebox"), as long as firebox hearth dimensions meet the minimum hearth dimensions shown below.

Model	A	B	C	D
NB18 with BO18(R,F)	26"	13"	18"	17"
NB24 with BO24(R,F)	29"	13"	221/4"	17"
NB24 with BO30(R,F)	33"	13"	251/4"	17"

Without front grate installed “B” will be 121/2.

C

D

A

B

Figure 2 - Hearth Minimum Dimension

81D0107

9

Image 9

Monessen Hearth NB18, NB24 operating instructions Fireplace and Hearth Dimensions, Model

Contents

Model NB18, NB24 Read and Save These InstructionsWhat to do if YOU Smell GAS Contents Important Safety Information InstallerOwner Massachussetts Residents only What YOU will Need for Installation Getting StartedMake Sure YOU have Received ALL Parts Product Features and Specifications General Installation Information CodesAdequate Combustion and Ventilation AIR BTU / Hr = Model Fireplace and Hearth Dimensions Height of Restriction Minimum Depth of Fireplace/Firebox Placement in a Fireplace with a Restrictive Barrier Sidewall and Ceiling Clearances Clearances and Height Requirements Clearances and Height Requirements Measuring Heat Resistant Material for Mantel Minimum Mantel Clearance with No Hood -NB18 Mum of 10 at a minimum of 28 above the opening Minimum Clearance above Combustible Flooring Floor Clearance Before Fully Installing the Unit Installing Vented ApplicationsBefore Installing the Appliance Damper Stop Installation Installing Vented Applications Assembly ProcedurePlacing and Securing Appliance Flexible Tube Manual Shutoff Gas Supply Inlet Valve Connecting the GAS Millivolt Valve Control Figure Checking GAS Pressure Electrical Wiring Millivolt Connecting Optional Wall Switch or ThermostatATE Connecting Remote Receiver Checking System OperationComplete Millivolt System Check Placing Rock Wool LOG Placement Placing Log #3 Cast Iron Grate Installation EMBER, GRATE, and Rock InstallationPlacing Flickering Embers Placing the Decorative Rock Flame Appearance Checking the Pilot FlameMillivolt Control and Thermostat Control Operating Instructions Checking the Burner Flame What to do if YOU Smell GAS Operating Instructions To Turn OFF GAS to Heater Cleaning and Servicing Operating Instructions and Cleaning and Servicing Observed Problem Possible Cause Remedy Troubleshooting ODS/pilot lights, but flame Burner Assembly Replacement Parts Accessories Sold Separately Replacement Parts List Description Qty BO18-R BO18-F BO24-R BO24-F BO30-R BO30-F Berkley OAK Refractory Logs Carbon Monoxide Detector Requirements Special Requirements 81D0107 81D0107 Lifetime Warranty Five Year WarrantyBasic Warranty