B. 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 avail- able 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 follow- ing 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 2.1, 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 Recommended

Location Location

Marginal

Location

Location

Not

Recommended

Location NOT

Recommended

Windward

Leeward

Multi-level Roofs

Figure 2.1

Heat & Glo • SL-550 / 750 / 950TV-D • 2053-985 Rev. H • 9/06

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Hearth and Home Technologies SL-750TV-IPI-D, SL-550TV-D, SL-950TV-IPI-D, SL-950TV-D, SL-550TV-IPI-D Negative Pressure
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SL-950TV-D, SL-750TV-D, SL-550TV-D, SL-550TV-IPI-D, SL-950TV-IPI-D specifications

Hearth and Home Technologies offers an impressive range of gas fireplaces with the SL-750TV-IPI-D, SL-950TV-IPI-D, SL-550TV-IPI-D, SL-550TV-D, and SL-750TV-D models. Each of these fireplaces showcases innovative design, outstanding performance, and advanced technology, making them a perfect choice for any modern home.

The SL-750TV-IPI-D is known for its large viewing area, providing a spectacular flame presentation that is both customizable and efficient. Its advanced IntelliFire® ignition system ensures reliable and easy operation, minimizing the need for manual ignition. This model also offers a balanced flue design that allows for flexible installation options, enhancing its versatility.

Similarly, the SL-950TV-IPI-D boasts a larger firebox, providing even more impressive heat output and increased aesthetics. Its high-efficiency rating ensures that energy consumption is kept low while delivering warmth. This model also utilizes the IntelliFire system, but it is enhanced with LED accent lighting, creating an inviting atmosphere while complementing the fireplace’s flickering flames.

On the smaller end of the spectrum, the SL-550TV-IPI-D combines compact design with remarkable efficiency. Its direct vent technology offers excellent venting options, allowing installation in various locations without compromising on performance. Equipped with adjustable flame settings, homeowners can tailor the experience to their liking, creating the perfect ambiance for any occasion.

The SL-550TV-D model takes a similar approach but focuses on traditional control mechanisms. This version allows users to manage the fireplace with ease through a manual control system while still maintaining the benefits of direct vent technology.

Lastly, the SL-750TV-D version offers a grand fireplace experience. It features a stunning glass front and can serve as a stunning focal point in larger living spaces. The model's durability is paired with elegant aesthetics, ensuring clients receive not just a heating solution but also a piece of art.

Collectively, all five models prioritize efficiency, design, and user-friendly features, ensuring that Hearth and Home Technologies delivers high-performing solutions that meet varied homeowner needs while offering the flexibility of installation and styles that fit seamlessly into any environment. Whether seeking warmth, style, or both, these fireplaces are worthy investments that enhance home living.
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