E. Negative Pressure

WARNING! Asphyxiation Risk! Negative pressure can cause spillage of combustion fumes and soot. Fireplace needs to draft properly for safety.

Draft is the pressure difference needed to vent fireplaces successfully. Considerations for successful draft include:

•Preventing negative pressure

•Location of fireplace and chimney

Negative pressure results from the imbalance of air available for the fireplace to operate properly. Causes for this imbalance include:

•Exhaust fans (kitchen, bath, etc.)

•Range hoods

•Combustion air requirements for furnaces, water heaters and other combustion appliances

•Clothes dryers

•Location of return-air to furnace or air conditioning

•Imbalances of the HVAC air handling system

•Upper level air leaks (recessed lighting, attic hatch opening, duct leaks)

To minimize the effects of negative air pressure, the fol- lowing must be considered:

•Install the fresh air kit. Install the intake on the side of the house towards prevailing winds during the heating season.

•Ensure adequate outdoor air is supplied for combustion appliances and exhaust equipment.

•Ensure furnace and air conditioning return vents are not located in the immediate vicinity of the fireplace.

•Avoid installing the fireplace near doors, walkways or small isolated spaces.

•Recessed lighting should be of “sealed can” design; attic hatches weather stripped or sealed; and attic mounted ductwork and air handler joints and seams taped or sealed.

•Basement installations should be avoided due to stack effect. Stack effect creates negative pressure in lower levels. Hearth & Home Technologies recommends the use of direct vent fireplaces in basements.

Location of the fireplace and chimney will affect perfor- mance. As shown in Figure 4.2, the chimney should:

•Be installed through the warm space enclosed by the building envelope. This helps to produce more draft, especially during lighting and die-down of the fire.

•Penetrate the highest part of the roof. This minimizes the effects of wind turbulence.

•Be located away from trees, adjacent structures, uneven roof lines and other obstructions.

Offsets can restrict draft so their use should be minimized. Consider the fireplace location relative to floor and ceiling and attic joists.

Recommended

Location

Marginal

Location

Location

Not

Recommended

Windward

Recommended

Location

Location NOT

Recommended

Leeward

Multi-level Roofs

Figure 4.2

Hearth & Home Technologies • BV4236DBI, BV4842DBI • 2209-900 Rev. N • 9/12

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Hearth and Home Technologies BV4236DBI manual Negative Pressure
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BV4236DBI specifications

The Hearth and Home Technologies BV4236DBI is a stunning direct vent gas fireplace that combines elegance with cutting-edge technology. Designed to enhance any living space, this fireplace provides a perfect blend of aesthetics and functionality, ensuring warmth and comfort during chilly evenings.

One of the standout features of the BV4236DBI is its contemporary design that offers a wide viewing area for the mesmerizing flames. With a sleek front and minimalistic frame, it fits seamlessly into modern home decor, making it an attractive focal point in any room. The large, unobstructed glass allows for maximum visibility of the fire, providing a cozy ambiance.

Performance-wise, the BV4236DBI boasts an impressive heating capacity. With a BTU output of up to 36,000, it effectively warms spaces ranging from medium to large. The efficiency of this fireplace ensures not only warmth but also reduced energy costs, making it an economical choice.

The BV4236DBI features advanced venting technology that allows for installation flexibility. The direct vent design draws air from the outside for combustion, ensuring that indoor air quality remains unaffected. This setup minimizes heat loss and creates a safe environment for users, making it suitable for homes of all types.

Another notable characteristic is the intuitive remote control and optional wall switch. This convenience feature allows users to easily adjust the flame height and heat output from anywhere in the room, ensuring customized comfort at the touch of a button. Additionally, the fireplace is equipped with an adjustable flame and media options, including decorative crushed glass or ceramic logs, which enhance the visual appeal.

Safety is a priority, and the BV4236DBI incorporates several safety features such as a built-in safety shutoff and an optional screen to prevent potential hazards. The fireplace's durable construction meets stringent safety standards, providing peace of mind for families.

In summary, the Hearth and Home Technologies BV4236DBI is a versatile, stylish, and efficient gas fireplace that offers an unmatched home heating experience. With its powerful performance, elegant design, and advanced technologies, it stands out as a prime choice for homeowners looking to elevate their living spaces with both comfort and sophistication. Whether for a cozy evening or a lively gathering, this fireplace provides the warmth and ambiance that every home deserves.
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