SKU: 88294984824

Mason-Lite B-Vent 12" Firestop/ Support Plate

Sale price$115.84 Regular price$128.71
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Description

Mason-Lite B-Vent 12" Firestop/ Support PlateB Vent is a GAS ONLY metal chimney with smaller diameters. For those fireplaces requiring complicated chimney runs, B Vent may be just the answer. What's Included Firestop Support Plate Features The support plate is designed to provide strength and durability for supporting large size pipe sections. Serves as a firestop. Supports up to 30 of pipe. Specifications Item Number Mason Lite 12BVFSP Product Type Firestop Support Plate Venting Type B Vent

B-Vent is a GAS ONLY metal chimney with smaller diameters. For those fireplaces requiring complicated chimney runs, B-Vent may be just the answer.

What's Included

  • Firestop/ Support Plate

Features

  • The support plate is designed to provide strength and durability for supporting large size pipe sections.
  • Serves as a firestop.
  • Supports up to 30’ of pipe.

Specifications

Item Number Mason-Lite - 12BVFSP
Product Type Firestop/ Support Plate
Venting Type B-Vent
Size (Diameter) 12"
MIN (A) 20"
MAX (B) 12 5/8"

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

Training Video

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.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 88294984824

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4.9 ★★★★★
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Rich man
Birmingham, US
★★★★★ 4
Nice
Color: Dark Tort/Green, Polarization Type: Non-Polarized, Lens Width: 50 Millimeters
Subdued retro look. Dark lens. Comfortable fit. Wish they came in amber.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 2, 2026
R
Ryan
Battle Creek, US
★★★★★ 5
Thick, robust and the perfect blend of dressy/casual
Color: Dark Tort/Green, Polarization Type: Non-Polarized, Lens Width: 50 Millimeters, Color: Dark Tort/Green, Polarization Type: Non-Polarized, Lens Width: 50 Millimeters
To be honest this is my first pair of sunglasses that costs more than $25. I never really knew why one would spend more on something you might sit on or lose. Decided to try these after realizing I wanted better clarity in the lenses. First impression on trying them on was the weight difference. These are quite a bit heavier than my cheaper pairs. Once I examined the materials I could see why. The build quality is excellent. The tortoise pattern is rich and looks high quality. Love the polished metal accents. At first I was a little leary about the metal on the front edges (i'm not a very "shiny" guy") but now I think it helps strike a balance between dressier glasses and casual. Very glad I stuck with these through the first few awkward moments. Wasn't sure about the shape at first but now i'm locked in. Curious to see what else Quay has to offer!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 1, 2025
M
Monty
Charlottesville, US
★★★★★ 3
Stylish looks, good lenses, warped frame?
Color: Dark Tort/Green, Polarization Type: Non-Polarized, Lens Width: 50 Millimeters
These sunglasses have nice build quality and good lenses on them. The green tint is not too strong and the style is excellent. My frames sit crooked on my face out of the box and they do not lay evenly on the counter when laying them down on the top surface. you can tap on one of the arms and the frames wobble. Looking at the main piece where the lenses are, the whole thing appears to be slightly twisted., which would explain the crooked fit on my face. Granted, our faces and ears aren't usually perfectly symmetrical, but this seems to be a fault of the sunglasses. I have tried lightly bending and twisting the frames to straighten them out, but I have not been entirely successful in doing so in fear of breaking them. They are comfortable to wear and look pretty stylish, but some information on adjusting the frames would be nice.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 20, 2025
C
CC
Grantham, US
★★★★★ 5
Sleek and stylish
Color: Dark Tort/Green, Polarization Type: Non-Polarized, Lens Width: 50 Millimeters, Color: Dark Tort/Green, Polarization Type: Non-Polarized, Lens Width: 50 Millimeters
Sleek and stylish sunglasses in a dark tortoise pattern. Simple classic design. Unisex design and fit. I especially like the wired sides that are easy and safe to customized to your head, ear, nose fit and comfort. Seems like a good value for quality, design, comfort and fit. Comes with a slim case. Nice sunglasses overall!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 9, 2025
F
Forrestt
Lexington, US
★★★★★ 5
Sturdy & well made & they stay in place!
Color: Dark Tort/Green, Polarization Type: Non-Polarized, Lens Width: 50 Millimeters, Color: Dark Tort/Green, Polarization Type: Non-Polarized, Lens Width: 50 Millimeters
Wow, these are really nice & well made sunglasses!! I love them better than my prescription sunglasses that I paid a ton for that I really don't need when I am out in the sun. They have some weight to them and don't feel like cheap sunglasses you get off the rack in a drugstore and they fit comfortably on my face and nose. The build-in nose pads hold them in place so they don't slip down my nose!! They come packaged with care in a nice carrying case and there's a lens-cloth included in the package. The price on these won't break the bank and I'm really glad to have found them as I do spend a lot of time in the sun or bright light.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 25, 2025

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