SKU:MFPST43
Mason-Lite 43" Pre-Cast Masonry See-Thru Firebox Kit
Mason-Lite 43" Pre-Cast Masonry See-Thru Firebox Kit
Decorative Gas Log & Burner
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30 in. See-Thru Virginiana Decorative Gas Logs and Burner
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Brick Panels
Metal Base
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6 in. Structural Metal Base for 39 in. Firebox
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Combustion Air Kit
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4 in. Combustion Air Kit for MFPST43 AND Linear Units
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Masonry Arch
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Height Kit
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Height Kit Includes (2) MFP43ST-3
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Chimney Shrouds
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32 in. Natural Copper Arlington Chimney Shrouds
32 in. Matte Black Arlington Chimney Shrouds
32 in. Dark Bronze Arlington Chimney Shrouds
32 in. Storm Gray Arlington Chimney Shrouds
36 in. Natural Copper Dover Chimney Shrouds
36 in. Matte Black Dover Chimney Shrouds
36 in. Dark Bronze Dover Chimney Shrouds
36 in. Storm Gray Dover Chimney Shrouds
40 in. Natural Copper Sussex Chimney Shrouds
40 in. Matte Black Sussex Chimney Shrouds
40 in. Dark Bronze Sussex Chimney Shrouds
40 in. Storm Gray Sussex Chimney Shrouds
40 in. Natural Copper Charleston Chimney Shrouds
40 in. Matte Black Charleston Chimney Shrouds
40 in. Dark Bronze Charleston Chimney Shrouds
40 in. Storm Gray Charleston Chimney Shrouds
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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 in lightweight fireplaces, it’s no wonder Mason-Lite is one of the industry leaders in 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:

What's Included
ITEM | DESCRIPTION | QTY |
1 | Hearth (left or Right) | 2 |
2 | Side Wallwith Outside Alr Kitaccess 04" Hole | 1 |
3 | Side Wall | 7 |
4 | Lower Side Dome | 2 |
5 | Lintel | 2 |
6 | Lower Dome Front | 2 |
7 | 53 X 4 X 3 X 1/4 Angle Iron | 2 |
8 | Upper Side Dome | 2 |
9 | Upper Dome Front | 2 |
10 | Dome Top | 1 |
12 | Rating Plate | 1 |
13 | #3 Rebar (03/8") X 36" | 4 |
14 | 016" Damper I Anchor Plate • | N/S |
15 | Insulation Blanket | N/S |
PARTS BELOW ARE FOR COMBUSTIBLE FLOOR SYSTEMS | ||
16 | Cement Board | N/S |
17 | Steel Support Platform 8 Inch High | 1 |
18 | Assy,floor Joist Brace | 4 |
Features
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EPA Phase II qualified with PureBurn |
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50% Lighter than traditional site-built masonry fireplaces |
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Superior thermal efficiencies with the highest resistance strength-up to 1700 Degrees Fahrenheit at 28 days |
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Meets or exceeds federal, state, and local construction building code requirements |
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Limited Lifetime warranty |
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USA and Canada approved |
The benefits are indisputable
- Use Dual 14" Class A UL103 Chimney
- Lightweight construction with multiple firebox sizes available
- Best fit and finish in the industry
- Indoor/outdoor, wood burning, natural and propane gas systems
- Approved for multi-story combustible wood floor installations
- Superior thermal efficiencies, with the highest resistance strength at 28 days
- Complies with UL 127 & UL 103 chimney component standards
- Traditional and contemporary burners and logs (optional)
- Full line of metal accessories available
- Easy Installation. No mess installation means lower costs and faster completion time.
- Limited lifetime warranty
- 100% USA Sourced & Manufactured
- NOTE: 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.
Specifications
Item Number | MFPST43 |
Product Type | Wood and Gas Burning Traditional Fireplace |
Cater Weight | 1631 lbs |
Floor Area | (53" x 28") 10.3 sq. ft. |
Footprint | 53" x 28" |
Framing Width | 57" |
Framing Height | 64 1/4" |
Framing Depth | 28" |
Mortar and Rebar | 58 lbs. |
Ready Mix | 100 lbs. |
Flue Size - Class A | Ø16" |
Metal Chimney Weight per foot | 12 lbs. |
Fireplace Weight | 1,423 lbs. |
Finished Opening Width | 40" |
Finished Opening Height | 30.5" |
Finished Opening Depth | 28" |
Total Unit Height | 62.25" |
Clearance to Combustibles (Sides and Back) | 2" |
Installation Type | Flush Installation / Corner / Internal Wall / Full Projection |
Warranty | Limited lifetime warranty |
Dimensions
Warranty
Lifetime Limited Warranty
MASON-LITE FIREPLACE
Masonry Fireplaces Industries, Inc. (MFI) warrants all Mason-Lite Fireplaces to be free from defects in materials that adversely affect fireplace performance for the lifetime of the product from the date of purchase, subject to the terms and conditions of this limited warranty.
MFI does not warrant accessory chimney, outside air ducts and devices not manufactured by MFI.
This warranty covers only products manufactured by MFI, specifically the modular concrete firebox, and NO WARRANTY, EXPRESS OR IMPLIED, EXTENDS TO ANY OF THE HARDWARE, FOUNDATION, VENTING, DUCTS, OR ACCESSORIES. THIS WARRANTY DOES NOT COVER DRAFTING, SMOKING, OR SOOTING OF THE FIREPLACE SYSTEM. Factors beyond the manufacturer’s control affect drafting, smoking, and sooting and MFI cannot guarantee these aspects of performance.
Coverage under this warranty is subject to the following conditions and exclusions:
- This warranty is null and void when the fireplaces are not installed pursuant to the installation instructions provided by MFI or local building codes have not been followed completely.
- Glass is warranted against thermal breakage only and only on models that are manufactured by MFI with a glass front. On Direct Vent models the safety glass or safety screen must be kept in front of this glass when fireplace is in use. Safety screen must be used on all models when in use.
- This warranty does not apply to any component or part that shows evidence of misuse, abuse, improper installation, accident or lack of regular maintenance. MFI is not responsible for misuse or mishandling of component parts.
- This warranty does not apply to any damage sustained to the appliance while in transit.
- Neither MFI, nor any affiliate thereof, is responsible for any labor costs or indirect costs incurred for the replacement of defective components. Any covered component that, in our judgment, is defective shall be repaired, replaced or refunded at MFI’s option.
- Nothing in this warranty makes MFI, or any affiliate thereof, liable in any respect for any injury or damage to the building or structure in which the fireplace has been installed or to the persons or property therein arising out of the use, misuse, or installation of properly manufactured MFI products.
- The fireplace must be used in accordance with operating instructions. The grate or andirons must be installed when using the fireplace.
NEITHER MFI, NOR ANY AFFILIATE THEREOF, SHALL BE HELD LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES OR EXPENSES ARISING OUT OF THE USE OF THE FIREPLACE. ALL SUCH DAMAGES AND EXPENSES ARE HEREBY EXCLUDED. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you.
If a component is found to be defective under the terms of this warranty, the party this warranty is extended to shall notify MFI in writing, by registered mail, within thirty (30) days following the discovery of the defect within the lifetime warranty period. The letter shall include proof of purchase and state the (1) date of purchase, model number and serial number ; (2) place of purchase; (3) address of installation; (4) name, address and phone number of the homeowner; and (5) a brief description of the defect.
This warranty applies only to those fireplaces installed in the continental United States, Alaska and Canada. If any part of this warranty is found to be unenforceable, the remaining parts shall remain in force and effect.
THE FOREGOING WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ALL OTHER WARRANTIES, TERMS OR CONDITIONS, EXPRESS OR IMPLIED EITHER IN FACT OR BY OPERATION OF LAW. MFI HEREBY DISCLAIMS ALL GUARANTEES AND WARRANTIES, EXPRESS OR IMPLIED, BEYOND THE WARRANTIES SET FORTH HEREIN, INCLUDING BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you.
Revision date: 1/29/2015
Documents & Files
Videos
Mason-Lite MGFP Burner and Logs
Mason-Lite Brick Panel Drystack
True Firebrick Panels Installation
Steel Throat Damper Installation
Frequently Asked Questions
Is the fireplace safe to use?Yes, it has been tested to UL 127 Standard for safety by PFS TECO. The fireplace is listed by PFS testing agency, ICC, (International Code Council) and quality control standards are used in manufacturing.(ESR -2401) |
Can I install the fireplace on a wood floor?Yes: please use the required metal base under unit sold by MFI or use CMU block. Air space clearances range from 6″ to 8″ depending on the model. |
Do I have to install the outside air kit on the fireplace?The local building code will tell you if this is required in your area. The fireplace will work without the outside air kit, although, it is more efficient to use outside air for combustion. |
Do I need firebrick inside the firebox?Yes: MFI can supply firebrick panels for easy installation or a mason can lay firebrick inside the firebox. |
What type of chimney do I use on this fireplace?The fireplace has been tested with both a masonry chimney, manufactured by MFI, or Class A listed metal chimney. The different models can use different diameter metal chimney that will fit almost all installation needs. When installed, the maximum overall height of the Mason-Lite fireplace is 40 feet. The minimum installation height is 14 feet, given that the chimney is straight. If the chimney is not straight, the minimum installation height is 17 feet. |
Do I need a log holder or grate in the fireplace?Yes, you should use a grate to hold the wood in the firebox for better combustion and safety. |
Can I install a mantel or decorative stone or marble on the front of the fireplace?Yes. Just follow the installation instructions for safe installations. |
Can I install decorative gas logs in this wood-burning fireplace?Yes. Follow the manufacturers instructions for safe installation and operation. |
Can I install a log lighter in the fireplace?Yes. Follow the manufacturers instructions for safe installation and operation. |
Can I install a glass door on the fireplace?Yes, Follow the manufacturers instructions and always have doors in the fully open position when using the fireplace. |
Can I install fireplace on upper levels floors of a building?Yes with the lightweight design of MFI fireplaces will work on most applications. You must have a structural engineer determine the load limit of the flooring. |
Can I install a see-thru wood-burning fireplace?Yes. The MFPST43 You will need to install a chimney exhaust type fan in most installations. |
Can I install this fireplace outside?Yes. It is listed for BOTH indoors and outdoors. |
What are the minimum and maximum fireplace heights for the Mason-Lite fireplace?When installed, the maximum overall height of the Mason-Lite fireplace is 40 feet. The minimum installation height is 14 feet, given that the chimney is straight. If the chimney is not straight, the measurement is 17 feet. |



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Researched and ordered my fireplace from US FIreplace Store. Pricing was a fair value however, the customer service was EXCELLENT! I had an issue with the direct vent venting. I called US Fireplace and the correct items were sent out the next day AND Janessa stayed on top of my return authorization and sent me the permissions and documents I needed to return the incorrect item and no cost to me, including return shipping. Overall, I am a very satisfied customer and my fireplace looks and operates flawlessly. I am glad that I selected US FIreplace to source my direct vent fireplace. Thank you for the great service.
Clay
Monteagle, TN
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I had placed an order, through Lowe's Home Improvement, for an Electric Firebox: Revillusion RBF42. Ordered 1st part of January. Was told I would have it in 3 weeks. When checking to see is it came in, was told it was delayed to 3/15. Was then told is was delayed until 4/25. Waited until 4/27 to check on it. Was then told it was now delayed until August. This firebox was going in a new Sun Room addition. I could not get my final inspection until the Firebox was installed. I went on line and googled for this same product. US Fireplace Store web site was given to me. This was on a Saturday. I call and reached a very nice man. Explain what I was look for. He checked and told me they had 30 of them in stock. I almost fell out of my chair. I clarified with him the product I was wanting. I ask how soon could I get it. He told me it would ship today. Again, was amazed. It arrived on the following Monday. What a pleasure and a relief working with US Fireplace Store and their employees. Exceed my expectations.
Thomas W.
Fort Mill, SC
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Great prices, quick delivery and fast hassle free services on the issue I encountered. I had purchased an electric fireplace unit that would not fit into the existing fireplace space. With one email I was able to get the wrong fireplace refunded and picked up at my home at no extra cost and the new one I purchased and delivered free of charge. Great company.
John P.
Denvers, MA
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