CHIMNEY

VENT

EQUIPMENT IN CONFINED SPACE ALL AIR FROM INSIDE

Air from Outside

If air from outside is brought in for combustion and ventila- tion, the confined space must have two permanent open- ings. One opening shall be within 12 inches (305 mm) of the top of the enclosure and one opening within 12 inches (305

 

HEATER

FURNACE

1_

OPENINGS (To Adjacent

WiTER/ Room)

I II I

NOTE - Each opening shall have a free area of at least one square inch (645 mm 2) per 1,000 Btu (.29 kW) per hour of the total input rat- ing of all equipment in the enclosure, but not less than 100 square inches (64516 mm2).

FIGURE 2

Air from Inside

If the confined space that houses the furnace adjoins a space categorized as unconfined, air can be brought in by providing two permanent openings between the two spaces. Each opening must have a minimum free area of 1 square inch (645 mm2) per 1,000 Btu (.29 kW) per hour of total input rating of all gas-fired equipment in the confined space. Each opening must be at least 100 square inches (64516 mm2). One opening shall be within 12 inches (305

mm)of the top of the enclosure and one opening within 12 inches (305 mm) of the bottom. See figure 2.

mm)of the bottom. These openings must communicate di- rectly or by ducts with the outdoors or spaces (crawl or at- tic) that freely communicate with the outdoors or indirectly through vertical ducts. Each opening shall have a minimum free area of 1 square inch (645 mm2) per 4,000 Btu (1.17 kW) per hour of total input rating of all equipment in the en- closure. See figures 3 and 4. When communicating with the outdoors through horizontal ducts, each opening shall have a minimum free area of 1 square inch (645 mm 2) per 2,000 Btu (.56 kW) per total input rating of all equipment in the enclosure. See figure 5.

When ducts are used, they shall be of the same cross-sec- tional area as the free area of the openings to which they connect. The minimum dimension of rectangular air ducts shall be no less than 3 inches (75 mm). In calculating free area, the blocking effect of louvers, grilles, or screens must be considered. Ifthe design and free area of protective cov- ering is not known for calculating the size opening required, it may be assumed that wood louvers will have 20 to 25 per- cent free area and metal louvers and grilles will have 60 to 75 percent free area. Louvers and grilles must be fixed in the open position or interlocked with the equipment so that they are opened automatically during equipment operation.

CHIMNEY OR

GAS VENT

VENTILATION LOUVERS

EQUIPMENT IN CONFINED SPACE

ALL AIR FROM OUTSIDE

(Inlet Air from Crawlspace and Outlet Air

to Ventilated Attic)

(Each end of attic)

I ...... I

OUTLET

FURNACEAIRWATER

HEATER

VENTILATION

INLET

LOUVERS

AIR

(For unheated crawl

!

NO TE- The inlet and outlet air openings shall each have a free area of at least one square inch (645

mm2) per 4, 000 Btu (1.17 kW) per hour of the total input rating of all equipment in the enclosure.

FIGURE 3

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Lennox International Inc G50UH-24A-070, G50UH-48C-110, G50UH-60D-135, G50UH-36C-110 WiTER/ Room, Air from Inside
Page 6 Page 8

G50UH-60D-155, G50UH-36B-090, G50UH-36A-070, G50UH-24A-045, G50UH-60D-135 specifications

Lennox International Inc is renowned for its high-quality heating, ventilation, and air conditioning (HVAC) solutions. Among its versatile product lineup are the G50UH series of gas furnaces, which exemplify efficiency and performance. These models, specifically the G50UH-24A-070, G50UH-24A-045, G50UH-36B-090, G50UH-36A-070, and G50UH-48C-135, offer a range of features tailored to meet varying residential heating demands.

One of the key features of the G50UH series is its energy efficiency. Many models in this lineup boast an impressive Annual Fuel Utilization Efficiency (AFUE) rating, which indicates their ability to convert fuel into usable heat efficiently. These high AFUE ratings can lead to significant savings on energy bills, making these furnaces a cost-effective choice for homeowners.

The G50UH series incorporates advanced technology, including multi-speed blowers that enhance comfort levels. This feature allows for better airflow control and can help maintain consistent temperatures throughout the home. The controlled airflow reduces temperature swings and ensures that every room benefits from the heating provided by the furnace.

Safety is paramount in Lennox designs, and the G50UH series is no exception. Each unit is equipped with safety features designed to protect both the furnace and the home. Dual certification ensures that the products meet stringent safety standards. Moreover, features like a self-diagnostic control board streamline maintenance, allowing homeowners to easily identify potential issues.

Another important characteristic of the G50UH series is its compact design, which is beneficial for homes with limited space. The units are designed to fit comfortably in various installation environments, from basements to utility rooms.

Durability is another hallmark of the G50UH furnaces. Constructed with quality materials, these units are designed for long-term reliability. This ensures that homeowners can enjoy the comfort of their heating systems without frequent repairs.

Lastly, Lennox provides extensive support and warranties, giving homeowners peace of mind associated with their purchase. With options tailored to meet diverse home heating needs, the Lennox G50UH series stands out in the HVAC market, combining efficiency, safety, and reliability in one impressive package.
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