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Choosing a Mason-Lite fireplace
Wood, B-vent gas or vent-free
The standard and Regal fireboxes burn wood and need a Class A (UL 103) metal chimney or the Mason-Lite masonry chimney; the standard sizes also take gas logs, and the PureBurn gas-assisted grate makes them EPA Phase II qualified. The MGFP B-vent models are gas-only, ship with the burner and logs, and vent through smaller B-vent pipe with 0" clearance to combustibles. The vent-free fireboxes need no chimney at all, but indoor vent-free fireplaces are not allowed in every jurisdiction.
Sizes and openings
Standard sizes are named by raw box width: lined with firebrick, the finished opening is 3" narrower, from 30" W on the MFP33 to 60" W on the MFP63. Regal and linear sizes are named by the finished opening. A height kit adds 8" of opening height to the standard sizes.
What to order with a firebox
Every firebox has to be lined with firebrick, either Mason-Lite brick panels (standard and see-through sizes) or hand-laid firebrick. Indoor wood-burning units also need a damper: a steel throat damper, a cast iron damper or an anchor plate/damper from the chimney maker. Add a structural metal base for a wood floor and a combustion air kit where code calls for outside air. Each product page lists what fits that model.
Mason-Lite FAQs
Can a Mason-Lite fireplace go on a wood floor or a second story?
Yes. Mason-Lite fireboxes are approved for multi-story and combustible floor installations with the Mason-Lite structural metal base or structural concrete block under the unit. Mason-Lite recommends having a structural engineer review any wood floor installation.
Do I need firebrick inside the firebox?
Yes. The firebox must be lined. Mason-Lite brick panels install in about 20 minutes and come in split herringbone, split running bond and full running bond patterns in gold, cream or black; a mason can also hand-lay firebrick. Panels are not made for the Regal, linear or MFP75 models.
What chimney does a wood-burning Mason-Lite use?
A UL 103 Class A metal chimney sized to the model (12" on the MFP33, MFP39 and MFP44, 14" on the MFP49, 16" on the MFP63 and MFPST43), or the 14" Mason-Lite masonry chimney, which fits the MFP33 through MFP49 up to 30 ft without added support. Mason-Lite gives a minimum indoor installation height of 14 ft with a straight chimney and 17 ft with an offset.
Is an outside air kit required?
Your local building code decides. The fireplace works without one, but Mason-Lite notes that outside air is more efficient. Standard fireboxes take the MFP4-AK-M kit; the see-through and linear units take the MFPST-AK-M.
Can Mason-Lite fireplaces be installed outdoors?
Yes. The standard fireboxes are built for indoor and outdoor use, and the Toscana pizza ovens are outdoor-only. Mason-Lite publishes guidance on waterproofing and on footings for outdoor installations, and the vent-free models have a higher outdoor input limit than indoor.
What warranty do Mason-Lite fireplaces have?
Masonry Fireplace Industries warrants the modular concrete firebox against defects in materials that affect performance for the lifetime of the product. Hardware, venting, foundation, accessories, labor and drafting or smoking are not covered, and the unit must be installed to Mason-Lite's instructions and local codes. Mason-Lite provides no warranty for its products if such products are not installed by a trained professional installer. Read the full terms in the Mason-Lite Lifetime Limited Warranty.
