MASONRY CHIMNEY: Masonry chimneys shall be built and installed in accordance with NFPS 211 or local codes. A minimum 5” diameter gas vent pipe (metal double wall Type B), or an approved clay flue liner or a listed chimney lining system must be used when venting into a naturally drafting, internal masonry chimney. 6 inch is required in elevations greater than 2000 feet, see Fig. 3. Local codes may require the use of both gas vent and an approved lining system when venting into a masonry chimney. The Commonwealth of Massachusetts requires the use of a listed liner. Lining systems include approved clay flue lining, a listed chimney lining system or other approved material that will resist corrosion, erosion, softening, or cracking from exhaust flue gases at temperatures up to 1800 degrees F. The lining system must be listed for use with naturally drafting, draft hood equipped gas appliances. Follow local codes and refer to NFGC 54 and NFPA 58.

When connecting the water heater to a masonry chimney the following connector guidelines must be followed for safe and proper operation: An approved gas vent connector must be attached to the top of the water heater and rise vertically at least 12” before entering into an approved gas vent connector elbow. Any gas vent section that is greater than 45 degrees from the vertical is considered horizontal. If a horizontal vent connector is to be used to connect the vertical gas vent connector on the top of the water heater to the masonry chimney, that approved horizontal gas vent connector must be kept as short as possible and must be sloped upwards at least ¼” per foot of its length. This connector must be supported throughout its horizontal length. This horizontal gas vent connection may be no greater than 75% of the total vertical gas flue vent within the chimney. Also, an approved thimble or collar must be used when penetrating a masonry chimney.

A) Existing INTERIOR Masonry Chimney

The metal gas vent pipe should be permanently mounted inside the masonry chimney. Double wall Type B gas vent is recommended. The masonry chimney may have to be tile or metal lined before the insertion of the gas vent pipe; check local codes for clarification. The lining material must be listed for use only with naturally drafting, draft hood equipped gas appliances. Follow manufactures instructions for installation of listed lining material. You may not vent any other fuel burning appliances into any free space remaining in the chimney. The minimum vertical gas vent length within the masonry chimney should be no less than 5 ft (1.5 m); the vent terminator should extend at least 3 feet (0.9 m) above where the chimney meets the roofline and at least 2 feet (0.6 m) higher than any vertical wall or similar obstruction within 10 feet (3.1 m). The top of the gas vent should have an approved vent terminator. See Figure C.

B) Tile Lined INTERIOR Masonry Chimney

The masonry chimney must have an approved liner, ceramic tile, clay or metal. The masonry chimney must be able to accommodate the spent fuel gasses; consult a HVAC engineer for chimney capacity. A common venting like-fuel appliance into this lined masonry chimney is permissible. The chimney’s diameter must be large enough to adequately draft the spent fuel gasses. See NFPA 54 for guidelines. A HVAC engineer will be required to spec a chimney system. The minimum vertical chimney length should be no less than 5 ft (1.5 m); the termination point should extend at least 3 feet (0.9 m) above where the chimney meets the roofline and at least 2 feet (0.6 m) higher than any vertical wall or similar obstruction within 10 feet (3.1 m). See Figure C.

C) EXTERIOR masonry Chimney

Refer to the National Fuel Gas Code and consult a local HVAC professional.

MASONRY CHIMNEYS

LISTED VENT CAP

GAS

VENT

VENT CONNECTOR

ESTABLISH A ONE

FOOT RISE BEFORE

ANY ELBOWS

Figure C

8

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Bosch Appliances 125B NGS, 125B LPS operating instructions Masonry Chimneys, Figure C 720 606
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125B NGS, 125B LPS specifications

Bosch Appliances has long been a revered name in the home appliance industry, recognized for its commitment to quality, innovation, and energy efficiency. Among its impressive lineup, the Bosch 125B NGS and the Bosch 125B LPS stand out for their advanced features and technologies that enhance the cooking experience in modern kitchens.

The Bosch 125B NGS is a gas cooktop designed for those who appreciate the precision of gas cooking. With its sleek stainless-steel design and intuitive controls, this appliance adds a touch of elegance to any kitchen. One of its main features is the rapid heating capability, thanks to the powerful burners that provide quick and even heat distribution. The cooktop includes multiple burner sizes, allowing users to choose the right heat level for various types of cooking, from simmering sauce to boiling pasta.

Additionally, the Bosch 125B NGS is equipped with an automatic re-ignition system, enhancing safety by ensuring that burners reignite if they go out. This feature is particularly beneficial in busy kitchen settings where distractions can occur. The continuous grate design allows for easy movement of pots and pans across the cooking surface, making multi-tasking a breeze.

On the other hand, the Bosch 125B LPS offers an electric alternative with a more modern flair. This built-in induction cooktop harnesses the power of induction technology, which uses magnetic fields to directly heat pots and pans. One of the key characteristics of this model is its exceptional energy efficiency, as it only heats the cookware, resulting in less wasted energy and cooler cooking surfaces. The Bosch 125B LPS features a touch control panel that allows for precise temperature adjustments at the touch of a finger.

Moreover, the model includes safety features such as a child lock and automatic shut-off, ensuring peace of mind for families. The sleek and minimalist design of the Bosch 125B LPS makes it a favorite among those who value aesthetics as much as functionality.

Both the Bosch 125B NGS and 125B LPS reflect the brand’s dedication to high-quality craftsmanship, innovative technology, and user-friendly operation, making them exemplary choices for anyone looking to elevate their culinary experience. Whether you prefer the hands-on approach of gas cooking or the quick precision of induction, Bosch offers reliable and versatile solutions to meet your kitchen needs.
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