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 4.3, 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 4.3

18

Heat & Glo • SL-550 / 750 / 950TV-IPI-E • 2119-900 Rev. H • 11/08

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Hearth and Home Technologies SL-750TV-IPI-E, SL-550TV-IPI-E, SL-950TV-IPI-E owner manual Negative Pressure
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SL-950TV-IPI-E, SL-550TV-IPI-E, SL-750TV-IPI-E specifications

Hearth and Home Technologies has long been a leader in the fireplace industry, renowned for blending innovation with functionality in their products. Among their impressive line-up, the SL-550TV-IPI-E, SL-750TV-IPI-E, and SL-950TV-IPI-E models stand out for their exceptional quality and advanced features, catering to various heating needs and aesthetic preferences.

The SL-550TV-IPI-E is designed for those wanting an efficient, stylish fireplace that fits seamlessly into modern living spaces. It offers a sleek design with expansive viewing areas, allowing for a captivating flame display. Its innovative IntelliFire Plus technology enhances convenience and efficiency by providing reliable, electronic ignition, which can be managed via a remote control. Noteworthy is the model's ability to operate with granular control, allowing users to adjust the flame height and heat output according to their needs.

Next, the SL-750TV-IPI-E steps up the game with its larger size and increased heating capacity. This model is perfect for medium to large rooms, providing excellent warmth while maintaining an elegant ambiance. Like the SL-550TV-IPI-E, it utilizes the IntelliFire Plus system for ease of use. In addition, it features a stunning firebox design that emphasizes authenticity with realistic logs and glowing embers, creating a true hearth experience. Its large viewing area enhances the visual impact, making it a focal point in any room.

Lastly, the SL-950TV-IPI-E is at the pinnacle of this series, offering the largest footprint and highest heating efficiency. Specifically designed for larger areas, this model not only delivers significant warmth but also serves as an impressive architectural feature. The SL-950TV-IPI-E integrates advanced heating technologies to maximize efficiency while minimizing fuel consumption. The remote control operation and customizable flame settings provide an exceptional level of convenience for homeowners.

All three models boast a range of customizable options, including finishes and surroundings, allowing them to fit a variety of decor styles. Their construction emphasizes quality, with durable materials designed to withstand the test of time. Furthermore, the sealed combustion system ensures safety and efficiency by drawing air from outside, reducing indoor air pollution.

In summary, the SL-550TV-IPI-E, SL-750TV-IPI-E, and SL-950TV-IPI-E models from Hearth and Home Technologies offer a harmonious blend of technology, aesthetics, and efficiency. Whether for ambiance or heating, these fireplaces provide a robust solution to enhance modern living spaces.
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