SKU: 3344576937

Mason-Lite B-Vent 12" Round Adjustable Pipe

Sale price$173.18 Regular price$192.42
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Description

Mason-Lite B-Vent 12" Round Adjustable PipeB 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 Round Adjustable Pipe Features Available in 10" and 12" diameters Used in combination with a straight length of pipe to ensure an exact length can be achieved. Specifications Item Number Mason Lite 12BV18A Product Type Adjustable Pipe Venting Type B Vent Size (Diameter) 12" MIN (A) 3" MAX

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

  • Round Adjustable Pipe

Features

  • Available in 10" and 12" diameters
  • Used in combination with a straight length of pipe to ensure an exact length can be achieved.

Specifications

Item Number Mason-Lite - 12BV18A
Product Type Adjustable Pipe
Venting Type B-Vent
Size (Diameter) 12"
MIN (A) 3"
MAX (B) 16"

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: 3344576937

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4.4 ★★★★★
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Marcia J.
Omaha, US
★★★★★ 5
Why would you want anything else?
Size: Standard (20" X 26"), Color: 02 - White, Number of Items: 2
I don’t know why anyone would want pillow cases that don’t fit the pillow. These are “envelope” style meaning the pillow tucks inside them for a perfect fit—no “leftover” pillowcase sticking out on the end. They’re very soft and cooling and I have so far bought ones for every bed in my house and will be getting more as extras. Highly recommend!
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Reviewed in the United States on May 17, 2026
B
Verified Purchase
Betty
Whiting, US
★★★★★ 3
Very soft
Size: Body (20" X 54"), Color: 06 - Sage Green, Number of Items: 1
The color was perfect. It’s very soft. The only thing that I really don’t like is the finish of the opening, it would be better with a zipper closure.
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Reviewed in the United States on May 13, 2026
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Shelby
Lake Worth, US
★★★★★ 5
Cool, Comfortable, and Worth Every Penny!
Color: Light Gray, Size: Standard
I’m honestly impressed with these pillowcases! From the first night, I could feel the difference—they stay noticeably cool, which is perfect if you tend to sleep hot like I do. The fabric feels silky smooth against the skin without being slippery, and it’s really gentle on both my hair and face. I’ve also noticed I wake up less sweaty and more comfortable overall. They fit my pillows well and don’t slip off during the night, which is a big plus. After washing, they held up great—no fading, shrinking, or loss of softness. If you’re looking for pillowcases that actually help keep you cool and comfortable through the night, these are definitely worth it. I’ll be buying more!
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Reviewed in the United States on April 7, 2026
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Verified Purchase
Sarah Benjamin
West Palm Beach, US
★★★★★ 5
Extremely cold, silky, gentle on hair
Color: White, Size: Queen
This was so cold when I removed it from the package that at first I thought it would be too cold. It was as if it had been in a freezer. I really like how silky it is on my face. (I can't stand a rough feeling pillowcase.) It is also gentle on my curly hair. The pillowcase can warm up from being slept on, but a shift of just a few inches gets back to wonderful cold. I highly recommend this as an extremely cool, silky smooth fabric. These are much colder than my very expensive miracle sheets.
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Reviewed in the United States on April 22, 2026
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Amazon Customer
Whiting, US
★★★★★ 5
Freaking Amazing 🤩
I never write reviews but these pillow cases absolutely deserve one!!! These are absolutely amazing! So soft and cool! I sweat so bad every night!! I wake up and my hair, shirt and pillow are drenched!!! I slipped these bad boys on as soon as they came in, and let me tell you! They were cold to the touch, I woke up this morning and I wasn’t sweating! I thought $20 something dollars was a little expensive for 2 pillow cases but was totally worth it! We love love love them!🩷🩷🩷Hubby approved😉
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Reviewed in the United States on May 18, 2026

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