Magnum Vent Free Firebox

For vent free design in a large format, look no further than our Magnum firebox. Two expanded sizes allow you to install almost any log set you wish.

Available Sizes:

  • 36"
  • 42"

Quick Look:

Heat DistributionRadiant
CertificationsCSA Design

* The use of vent free appliances is prohibited in Canada and some US states. Please check your state code for vent free products.
Gas Log Sets sold separately. See Monessen Gas Log Sets.


Monessen offers one of the most diverse lineups of gas vent free fireplaces available, making it easy to find the right look for your home. Enjoy beautiful flames, excellent heating and a customized look, and many added benefits.


This firebox offers a radiant design and taller opening to help warm larger rooms. Finish your fireplace right up to the firebox and select interior and exterior style options for a custom look.


Vent free gas fireplaces (available in natural gas and propane) are a safe, green and energy efficient way to add heat to your home — in fact, they’re 99.9% energy efficient. Because they are vent free, none of the heat gets lost up a vent, flue or chimney. Instead, fuel dollars get transformed into heat-warming energy. Plus, you can always be assured of a heat source, even in the event of a power outage.


Because vent free fireplaces are designed to be installed and operated without a chimney, flue or vent, they can be installed in locations in your home where it would be impossible to install a vented fireplace. They provide the most economical installation, only requiring a connection to a gas line.


With multiple facing and firebrick options available, you can tailor the look of the fireplace to suit your tastes and décor.


Monessen vent free fireplaces allow for zero clearance installation, which means they may be installed flush against any combustible surface such as drywall or wood. This gives you added flexibility and helps save installation dollars when deciding where to install your fireplace, whether on an interior or exterior wall.


Monessen offers a selection of vent free log sets (sold separately) that are a perfect complement to your new fireplace. Ask your dealer for details.

Accessories that fit your home and lifestyle

  • Blower Kit

    Adding a variable thermostat controlled forced air blower to your stove setup provides increased heating efficiency.

  • Curved Trim Kits

    Available in two sizes and two colors, these curved trim kits must be attached before installing the product in the wall.

  • Outside Combustion Air Kit

    Draws in outside combustion air for your firebox rather than pulling it from the room. Equips your fireplace to vent to the outside. Includes chimney collar and cap.

  • Arched Fronts

    These classic arched fronts feature a lower door for control access.

  • Cabinet Door Frames

    Available in two sizes, these frames are required for cabinet door installation.

  • Cabinet Doors with Screen

    Available in two sizes, these screened door sets provide a decorative accent that adds allure to your firebox.

Dimensions in inches. Refer to installation/owner's manual for detailed specifications on installing this product. Hearth & Home Technologies reserves the right to update units periodically. Product installation must adhere strictly to instructions shipped with product.

Model Specifications


Size: 42"
Styling: Ceramic Fiber 3D Firebrick or Herringbone Firebrick
Dimensions: 47 (W) x 37-3/8 (H) x 18-1/4 (D)
Hearth Dimensions: 38-1/8 (W) x 25 (H) x 15 (D) x 31-3/4(RW)
Fire Viewing Area: 42" x 26-1/8"
Viewing Style: Front
Venting: Vent Free
Termination: None
Certifications: CSA Design


Size: 36"
Styling: Ceramic Fiber 3D Firebrick or Herringbone Firebrick
Dimensions: 41-1/4 (W) x 37-3/8 (H) x 18-1/4 (D)
Hearth Dimensions: 32-1/8 (W) x 25 (H) x 15 (D) x 25-3/4(RW)
Fire Viewing Area: 36" x 26-1/8"
Viewing Style: Front
Venting: Vent Free
Termination: None
Certifications: CSA Design
Heat output will vary depending on the type of fuel used. The flame and ember appearance may vary based on the type of fuel burned and the venting configuration used. Actual product appearance, including flame may differ from image shown. Refer to the Owners Manual for complete clearance requirements and specifications. Product specifications and pricing subject to change without notice. For testing and listing information please refer to the owners/installation manual.
*For select products: Heating capacity to be used as a guide only. See your local dealer for help in determining the product that best suits your heating needs based on climate and home efficiency.
For wood-burning appliances: Actual burn times will vary based on how the appliance is operated, load size, moisture content and type of wood used, and installation.

Product Brochures

Owner's Manuals