3.Insulate combustion air inlet piping when run in warm, hu- mid spaces such as basements.

Sizing Combustion Air and Vent Pipe

Consult Table 3 or Table 4 to select the proper diameter exhaust

and combustion air piping. Exhaust and combustion air piping is sized for each furnace Btuh size based on total lineal vent length (on inlet oroutlet side), and number of 90 ° elbows required. Two 45 ° elbows can be substituted for one 90 ° elbow. The elbow or el- bows used for vent termination outside the structure ARE counted,

including elbows needed to bring termination above expected snow levels. The elbow inside the furnace on the *9MPD IS NOT

included in the count.

Pipe Diameter Table

N9MP1 & *9MPD Models

50,000, 75,000 & 80,000 Btuh Furnaces

40'& (5) 90 ° elbows with 2" PVC pipe or 70'& (5) 90 ° elbows with 3" PVC pipe

100,000 Btuh Furnace

40'& (5) 90 ° elbows with 3" PVC pipe or 70'& (5) 90 ° elbows with 3" PVC pipe & Long Vent Kit (See Tech. Manual)

125,000 Btuh Furnace

40'& (5) 90 ° elbows with 3" PVC pipe Elbows are DWV Long Radius Type for 2" and 3" vents.

If more than five elbows are required, reduce the length of

both the inlet and exhaust pipes 5' for each additional elbow used.

NOTE: It is allowable to use larger diameter pipe and fitting than shown in the tables but not smaller diameters than shown.

Pipe Diameter Table

N9MP2 Models

50,000 & 80,000 Btuh Furnaces

40'& (5) 90 ° elbows with 2" PVC pipe or 70'& (5) 90 ° elbows with 3" PVC pipe

75,000 Btuh Furnaces

25'& (3) 90 ° elbows with 2" PVC pipe or 40'& (5) 90 ° elbows with 2" PVC pipe & Long Vent Kit (See Tech. Manual) or 70'& (5) 90 ° elbows with 3" PVC pipe

100,000 Btuh Furnace

40'& (5) 90 ° elbows with 3" PVC pipe or 70'& (5) 90 ° elbows with 3" PVC pipe & Long Vent Kit (See Tech. Manual)

125,000 Btuh Furnace

40'& (5) 90 ° elbows with 3" PVC pipe Elbows are DWV Long Radius Type for 2" and 3" vents.

If more than five elbows are required, reduce the length of

both the inlet and exhaust pipes 5' for each additional elbow used.

For "Concentric Termination Kit" Venting table, see "Section 11" in this manual.

Vent Termination Clearances

CARBON MONOXIDE POISONING, FIRE AND EXPLOSION HAZARD.

Failure to properly vent this furnace could result in death, personal injury and/or property damage.

Inlet and outlet pipes may NOT be vented directly above each other.

1.Determine termination locations based on clearances spe- cified in following steps and as shown in Figure 7, Figure 8, Figure 20, through Figure 28.

For "Concentric Termination Kit"clearances, see Figure 46, Figure 47, Figure 48, Figure 49 and Figure 50 in "Section 10" in this manual.

2.For Single Pipe Installation, models N9MP1 or *9MPD, refer to Figure 8 for vent termination clearances.

3.For Direct Vent Installation, models N9MP2 or*9MPD, refer to Figure 7 for vent termination clearances.

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Sears N9MP1050B12B1, N9MP2050B12B1 Sizing Combustion Air and Vent Pipe, N9MP1 & *9MPD Models, Vent Termination Clearances

9MPD100J20B1, N9MP2100J20B1, 9MPD050F12B1, N9MP1100J20B1, N9MP1125J20B1 specifications

The Sears N9MP1075B12B1, N9MPD125L20B1, N9MP1050B12B1, N9MPD080J16B1, and N9MP2125J20B1 are part of the trusted line of gas furnaces manufactured by Sears, specifically designed to deliver reliable heating solutions for residential applications. These models incorporate cutting-edge technology and robust engineering, making them popular choices among homeowners looking for efficiency and comfort.

One of the main features of these models is their high-efficiency operation. With Annual Fuel Utilization Efficiency (AFUE) ratings exceeding 90%, these furnaces convert a significant portion of fuel into usable heat, thereby reducing energy costs. The N9MP series employs a multi-speed blower system that optimizes airflow for enhanced comfort while minimizing noise levels, ensuring a pleasant indoor environment.

The N9MPD125L20B1 and N9MPD080J16B1 variants highlight their adaptability through dual-stage heating capabilities. This technology allows the furnace to adjust its output based on the thermal demands of the home, preventing energy wastage during milder conditions while providing robust heating during extreme cold spells. The two-stage combustion process not only improves comfort but also contributes to lower greenhouse gas emissions.

Durability is another hallmark of these Sears models. With heavy-duty heat exchangers crafted from high-quality materials, they are built to withstand the rigors of regular use. Additionally, the inclusion of advanced safety mechanisms ensures that the system operates securely, reducing potential risks associated with gas furnaces.

The N9MP2125J20B1 model stands out due to its whisper-quiet operation. Homeowners can enjoy a warm home without the disruptive sound commonly associated with traditional heating systems, thanks to the insulated cabinet design and efficient blower operation.

Furthermore, these models come equipped with user-friendly digital thermostats, which allow precise temperature control and programmable settings, enabling homeowners to tailor their heating needs to fit their lifestyle. The compatibility with smart home systems also adds convenience, enabling users to manage their heating remotely, saving even more energy.

In conclusion, the Sears N9MP1075B12B1, N9MPD125L20B1, N9MP1050B12B1, N9MPD080J16B1, and N9MP2125J20B1 gas furnaces exemplify innovation in heating technology. Their energy-efficient designs, advanced features, and durable construction make them reliable choices for homeowners seeking comfort and sustainability in their heating solutions.