Adequate Combustion and Ventilation AIR

DFX & DBX Series Vent Free Fireplaces

COMBUSTION and VENTILATION AIR

ADEQUATE COMBUSTION AND VENTILATION AIR

This heater shall not be installed in a confined space or unusually tight construction unless provisions are provided for adequate combustion and ventilation air.

The National Fuel Gas Code, (ANSI Z223.1/NFPA54), defines a confined space as a space whose volume is less than 50 cubic feet per 1,000 BTU per hour (4.8 m3 per kw) of the aggre- gate input rating of all appliances installed in that space, and an unconfined space as a space whose volume is not less than 50 cubic feet per 1,000 BTU per hour (4.8 m3 per kw) of the aggregate input rating of all appliances installed in that space. Rooms communicating directly with the space in which the appliances are installed, through openings not furnished with doors, are considered a part of the unconfined space.

Unusually tight construction is defined as construction where:

a)walls and ceilings exposed to the outside atmosphere have a continuous water vapor retarder with a rating of 1 perm

(6 x 1011 kg per pa/sec-m2) or less with openings gasketed or sealed;

b)weather striping has been added on openable windows and doors, and

c)caulking or sealants are applied to areas such as joints around window and door frames, between sole plates and floors, between wall-ceiling joints, between wall panels, at pen- etrations for plumbing, electrical, and gas lines, and at other openings.

The following formula can be used to determine the maximum heater rating per the definition of unconfined space:

BTU/hr = (L1 + L2) Ft x (W) Ft x (H) Ft x 1000 50

Consider two connecting rooms with an open area between, with the following dimensions: L1 = 15Z\x Ft., L2 = 12 Ft., W = 12 Ft., H = 8 Ft.

BTU/hr = (15Z\x + 12) x (12) x (8) x 1000 = 52800 BTU/hr 50

If there were a door between the two rooms the calculation would be based only on the room with the heater.

BTU/hr =	(15Z\x) x (12) x (8)	x 1000 = 29,760 BTU/hr
	50

Room Divider

Fireplace

FP2439

Figure 3 -

Example of a Large Room with a Room

Divider

WARNING

If the area in which the heater may be operated is smaller than that defined as an unconfined space or if the building is of unusually tight construction, provide adequate combustion and ventilation air by one of the methods described in the National Fuel Gas Code, ANSI Z223.1/NFPA54, Section 5.3 or applicable local codes.

33D4047

DFX24C specifications

The Monessen Hearth DFX24C is a stylish and efficient direct vent gas fireplace designed to enhance the ambiance of any living space while providing warmth and comfort. With its sleek design and advanced features, this fireplace brings modern aesthetics to traditional charm.

One of the standout features of the DFX24C is its powerful heating capability, which can produce an impressive output of up to 24,000 BTUs per hour. This makes it an ideal choice for heating areas ranging from family rooms to open-concept living spaces. The direct vent technology employed in this fireplace allows for optimal efficiency by utilizing outside air for combustion while venting exhaust gases to the outside, ensuring that the indoor air quality remains unaffected.

The DFX24C comes equipped with an intuitive remote control, giving homeowners the convenience to adjust the settings at their fingertips. Users can easily regulate the flame height and heat output, allowing for personalized comfort in any situation. Additionally, the fireplace features an impressive standing pilot light that ensures reliability and ease of ignition.

Aesthetically, the Monessen Hearth DFX24C doesn't disappoint. With a large viewing area framed by a clean face design, it allows for an unobstructed view of the beautiful flames dancing within. The realistic log set creates a lifelike portrayal of a traditional wood-burning fireplace, providing the cozy hearth feel that many homeowners desire. The glass front adds to the elegance while reflecting warmth throughout the room.

From a safety perspective, the DFX24C is built with child-safe features, including a safety screen to prevent accidental contact with the hot surfaces. The fireplace is also equipped with a ceramic glass front that withstands high heat while offering excellent thermal efficiency.

Energy efficiency is a critical consideration for many homeowners today, and the DFX24C stands out with its impressive efficiency ratings. With proper installation and maintenance, users can expect lower heating bills and a smaller carbon footprint.

In summary, the Monessen Hearth DFX24C is a perfect blend of modern technology, aesthetic appeal, and efficient heating capabilities. It's an excellent choice for those looking to add both warmth and style to their home, making it a worthy investment for any homeowner seeking to enhance their living space.