Negative Pressure | Hearth and Home Technologies CB4236IR, CB4842IR

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 mini- mized. Consider the ﬁreplace location relative to ﬂoor and ceiling and attic joists.

			Recommended	Recommended
			Location	Recommended
				Location
	Location	Marginal
	Location	Location
	Not	Location
	Not
	Recommended
						Location
						Not
						Recommended
Windward
							Leeward
			Multi-level Roofs
Figure 4.2
16		Heatilator	• Caliber BV Series		•	4040-262 Rev J •	10/08

CB4842IR, CB4236IR specifications

Hearth and Home Technologies introduces the CB4842IR and CB4236IR, two premium fireplace options designed to enhance the ambiance and warmth of any space. Both models combine modern technology with elegant design, making them ideal choices for contemporary homes.

The CB4842IR features a large viewing area, measuring 48 inches wide, which provides an impressive visual display of the flames. Its contemporary design allows for a seamless integration into various interior styles, from rustic to minimalist. On the other hand, the CB4236IR, with its 42-inch width, offers a slightly more compact option, perfectly suited for smaller spaces without sacrificing style or warmth.

Both models utilize advanced infrared technology, which provides efficient heat distribution while maintaining a comfortable and inviting atmosphere. This technology ensures that the warmth is evenly radiated throughout the room, creating a cozy environment even in larger areas. Additionally, the infrared heat is effective in penetrating objects and surfaces, resulting in a feeling of warmth that is deeply satisfying.

A standout feature of these fireplaces is the customizable flame settings that allow users to adjust the ambiance to their preference. With multiple flame color options, users can choose from traditional yellow flames to vibrant blue hues, adding a personal touch to the fireplace experience. This feature is particularly useful for setting the mood during different occasions, whether it's a romantic dinner or a lively gathering with friends.

Both the CB4842IR and CB4236IR come equipped with user-friendly controls, enabling easy operation from anywhere in the room. Additionally, they offer programmable thermostats for precise temperature control, further enhancing user convenience and energy efficiency.

Safety features are paramount with Hearth and Home Technologies, and both models include built-in safety mechanisms such as automatic shutoff functions. This ensures peace of mind, whether you're at home or away. Furthermore, the fireplaces are designed for easy maintenance, with features that simplify cleaning and upkeep.

In conclusion, the Hearth and Home Technologies CB4842IR and CB4236IR fireplaces combine aesthetic appeal with advanced heating technology. With customizable flame settings, user-friendly controls, and robust safety features, these models stand out as premium options for anyone looking to enhance their living space with a touch of elegance and warmth. Whether for functionality or style, these fireplaces cater to the needs of modern homeowners, blending seamlessly into any décor.