Table 3: Suggested Duct Sizes for Homes, Quiet Offices, Or Similar Installations

(Based on a 0.1 in. W.G. static pressure drop per 100 ft. of duct.)

7.The supply and return air ducts, or flexible joints, should be carefully secured and sealed to the appliance housing to prevent air leakage from, or into, the duct system. For best performance, insulate the outside surfaces of the ducts to reduce heat loss from, or heat gain to, the ducts.

8.As a final step in the installation, the appliance must be adjusted to deliver a temperature rise within the range of 50° to 80°F. Adjust the blower motor speed to obtain a temperature rise within the acceptable range. The required blower speed will depend on the airflow resistance of a supply and return air duct systems.

Fig. 9: 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.

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Thermo Products OH6FA072DV4N, OH8FA119DV5R, OH8FA119D60R, OH6FA072D48N, OH6FX072DV4R Supply air duct sizing Example
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OH8FA119D60B, OH8FA119DV5B, OH6FX072DV4R, OH6FA072DV4N, OH6FA072D48N specifications

Thermo Products has established a reputation for delivering high-quality heating solutions tailored for various applications. Among their standout offerings are the OH8FA119DV5R, OH8FA119D60R, OH6FA072D48B, OH6FA072D48N, and OH6FA072DV4N models. These units are engineered with precision and incorporate advanced technologies to deliver reliable performance in residential and commercial settings.

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