All installations and services must be performed by qualified service personnel.

Fig. 8: Supply air duct sizing Example

The RETURN AIR DUCT SYSTEM should equal the warm air duct system in airflow capabilities.

NOTE: When a return register is located in the same room as the furnace, the register must be at least 20 feet away from the furnace.

SIZING THE DUCT WORK FOR A COMBINATION HEATING AND COOLING SYSTEM:

Two formulas must be used in determining the CFM requirements of a combustion heating and cooling system.

1.HEATING CFM:

HEAT OUTPUT OF FURNACE (BTUH)

1.1 X TR (TEMPERATURE RISE, °F) = HEATING(CFM)

EXAMPLES:

A. 110,000 BTUH OUTPUT

1.1X 85°F TR = 1176 CFM FOR HEATING B. 110,000 BTUH OUTPUT

1.1X 70°F TR = 1429 CFM FOR HEATING

2.COOLING CFM: 400 CFM X COOLING TONNAGE (12,000 BTUH PER TON)=AIRFLOW FOR COOLING(CFM)

EXAMPLES:

A.400 CFM X 3 TON (12,000 BTUH) = 1,200 CFM FOR COOLING 1TON

B.400 CFM X 2.5 TON (12,000 BTUH) = 1,000 CFM FOR COOLING 1 TON

IMPORTANT: SIZE THE DUCT SYSTEM FOR THE LARGER OF THE TWO AIRFLOW REQUIREMENTS

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Thermo Products MO-425 manual Supply air duct sizing Example
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MO-425 specifications

The Thermo Products MO-425 is an advanced heating solution designed for both residential and commercial applications. Known for its efficiency and innovative features, the MO-425 stands out in the market for those seeking reliable performance in temperature control.

One of the key characteristics of the MO-425 is its energy efficiency. It utilizes cutting-edge technology that minimizes energy consumption while optimizing heating output. The unit is equipped with a high-efficiency motor that reduces electricity usage, making it an eco-friendly choice for consumers concerned about energy costs and environmental impact.

The MO-425 also boasts a robust construction designed for durability. Made from high-quality materials, the unit is built to withstand the rigors of frequent use while maintaining its performance over time. This reliability is complemented by an advanced heating element that provides consistent warmth, ensuring that users enjoy a comfortable environment regardless of weather conditions.

In terms of controls, the Thermo Products MO-425 features a user-friendly interface, allowing for easy adjustments to temperature settings. The digital thermostat enables precise temperature control, which not only enhances comfort but also contributes to energy savings. Additionally, the unit has programmable features, allowing users to set heating schedules according to their routines, further promoting efficiency.

Another notable feature of the MO-425 is its quiet operation. The design includes sound-dampening technology that reduces noise levels during operation, making it suitable for use in living spaces, offices, and other environments where peace and quiet are essential.

The MO-425 is also versatile, offering multiple installation options to accommodate various spaces. It can be mounted on walls or used as a portable unit, making it adaptable to different room layouts and heating needs. This flexibility ensures that users can find the ideal setup for maximizing warmth and comfort in their environments.

Additionally, the Thermo Products MO-425 is backed by excellent customer support. Users can rely on a robust warranty and access to assistance for any inquiries, ensuring a positive ownership experience.

Overall, the Thermo Products MO-425 is a top-tier heating solution that combines efficiency, durability, and user-friendly features. Whether for residential or commercial use, it addresses the critical needs of modern heat management, making it a valuable addition to any home or workspace.
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