Mason-Lite 43" Vent Free See-Thru Firebox Kit

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Have you ever dreamed of the radiant warmth of a masonry fireplace in your bedroom? Or, do you dream of an outdoor fireplace where you can gather together with friends and loved ones? Dreams can come true with Mason-Lite masonry fireplaces. Our factory-built masonry fireboxes are affordable, easy to handle, and consistent in quality. A masonry fireplace adds luxury and increases the value of your home.

Recreating the tradition of the hearth and the elegance & romance of the flame, Mason-Lite captures the essence of the fireplace masonry artists have been crafting for centuries. And, with a proven history of superior quality, lightweight fireplaces for indoor and outdoor projects, it’s no wonder Mason-Lite is one of the industry leaders of modular concrete fireplaces.

At Mason-Lite, we use the finest aggregate materials available to build our lightweight modular concrete fireplaces. One of the main ingredients is pumice, a natural-fired volcanic rock with tremendous strength.

Its lightweight attributes are second to none, and because of its pre-fired beginnings, pumice retains heat better than any natural aggregate available. The best sources for USA pumice are in the western states, convenient to Mason-Lite’s California-based production facilities. Pumice is formed when gas-rich, frothy magma rapidly cools, creating air pockets that contribute to its remarkable lightweight properties.

Because it is only half the weight and half the cost of traditional masonry fireplaces, Mason-Lite Lightweight Masonry Fireplace Systems help you realize your dream of having a fireplace in your master bedroom, upstairs retreat, or even your outdoor patio, without major building infrastructure reinforcement. The restful flicker and comfortable glow of the fire will provide you with years of treasured memories.

With the help of ICC-ES, Mason-Lite developed the structural testing and performance criteria (AC375) that would comply with the International Building Code (IBC), the International Residential Code (IRC), and the International Fuel Gas Code (IFGC). This allows building officials throughout the US to confirm that Mason-Lite fireplaces meet these stringent codes.

Why Choose Mason-Lite:


  • Available in standard sizes: 39”, 44”, and 49” model
  • Lightweight construction with multiple sizes available
  • Allowed for multi-story combustible floor installations.
  • Approved with Any ANSI Z-21.11.2 approved gas log set* and vent-free burners for contemporary media
  • Less expensive shipping and handling costs.
  • 50% cheaper than a traditional hand-built masonry fireplace.
  • Convenient, No-mess operation
  • Requires zero clearance to combustibles
  • Dynamic thermal efficiencies, with the highest resistance strength at 28 days
  • Best fit and finish in the industry
  • All kits come complete with refractory mortar, Re-bar, and T-bar
  • More radiant heat
  • Limited Lifetime warranty.
  • Made in the U.S.A.


Vent-Free log sets not included



Maximum BTUs for Indoor Application 40,000
Maximum BTUs for Outdoor Application 50,000
Framing Dimension 53" (W) x 48" (H) x 28" (D)
Total Unit Height 46.75"
Floor Area
(53" x 28")10.31 sq. ft.
Fireplace Weight
1306 lbs.
Mortar and Rebar 67 lbs.
Ready Mix 120 lbs.
Clearance to combustible 0"
Installation Type Flush Installation / Corner / Internal Wall / Full Projection
Warranty Limited lifetime warranty

Product Inclusions

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 Refractory Mortar

Rebar and T-Bar


Optional Accessories

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Split Herringbone Brick liner

Mason-Lite offers true firebrick panels for quick and easy installation.

Two color options: Standard Buff and Red

Full Running Bond Brick liner

Mason-Lite offers true firebrick panels for quick and easy installation.

Two color options: Standard Buff and Red

Split Running Bond Brick liner

Mason-Lite offers true firebrick panels for quick and easy installation.

Two color options: Standard Buff and Red

MFP4-AK Combustion Air Kit

Because homes are being built so tight, many jurisdictions are requiring additional outside air to make up for negative air pressure. For convenience, the kit comes pre-drilled for this application.

MFP-Arc Masonry Arch

The masonry arch kit consists of 2 pieces that can easily be mortared in to give a custom look.


Attention: You may need a residential building permit to install a Mason-Lite Fireplace. Consult local jurisdictions before you get started!