Maximum Vent Length

Thermo Products CHX1-100N Replacing AN Existing Furnace from a Common Vent, Maximum Vent Length

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

Equipment must be installed in accordance with regulations of the National Board of Fire Underwriters and the National Fuel Gas Code. Authorities having jurisdiction should be consulted before installations are made.

C. REPLACING AN EXISTING FURNACE FROM A COMMON VENT

: These furnaces may not be common vented with any other appliance.

D. GENERAL REQUIREMENTS FOR VENTING CHX1/CDX1

The CHX1/CDX1 furnace venting system must be installed by a qualified service person in accordance with local codes, the National Fuel Gas Code (NFPA 54/ANSI Z223.1 or latest edition) and these instructions.

The following items and local code requirements must be followed:

1.The vent/air intake terminations outlined by Thermo Products in this manual must be used.

2.The entire vent/air intake system must be made of PVC Schedule 40 pipe.

NOTE: All CHX1/CDX1 furnaces recommended to be installed with outside combustion air.

3.The flue vent pipe and combustion air pipe must be at least as large as the exhaust vent/air intake pipe specified by Thermo Products. No reduction in size is permissible. The CHX1, CDX1-75 requires 2” Schedule 40 PVC pipe. The (CHX1, CDX1)-100 and 125 require 3” Schedule 40 PVC pipe.

4.This CHX1/CDX1 furnace shall not be common vented with any other appliance including those burning solid fuels.

5.Horizontal runs of exhaust vent pipe shall slope upward at least 1/4” per foot from the outlet of the furnace (CHX1’s) or the outlet of the drain tee (CDX1’s) to the vent termination at the outside wall. This will permit proper drainage of the condensate. Horizontal runs of inlet vent pipe shall slope downward at least 1/4” per foot from the outlet of the last elbow or last horizontal run, before exiting the wall, to the vent termination at the outside wall.

6.The vent pipe must be supported every 4 feet and at every joint to prevent pipe blockage caused by condensate trapped by a sag in the vent.

7.The maximum permissible vent length of straight pipe and number of elbows permitted for the exhaust vent and combustion air inlet is shown in Table 2. The elbows shown are in addition to the length of straight pipe permitted. When counting elbows, all elbows used in the exhaust vent or combustion air intake must be counted. This includes elbows used inside the furnace jacket and termination elbows. In addition, up to three elbows may be dropped and the vent length extended five feet for each elbow dropped.

TABLE 2

VENT SIZE		2 IN. PVC			3 IN. PVC
FURNACE	VENT	EXHAUST	COMBUSTION	VENT	EXHAUST	COMBUSTION
MODEL	LENGTH	VENT	AIR INTAKE	LENGTH	VENT	AIR INTAKE
	(FT.)	ELBOWS (NO.)	ELBOWS (NO.)	(FT.)	ELBOWS (NO.)	ELBOWS (NO.)
CHX1/CDX1-75	35	8 1, 2	7 2	-	-	-
CHX1/CDX1-100		NOT PERMITTED		35	8 1, 2	7 2
CHX1/CDX1-125		NOT PERMITTED		35	8 1, 2	7 2

CDX1-100N, CDX1-125N, CHX1-100N, CHX1-75N, CHX1-125N specifications

Thermo Products has established itself as a leader in the HVAC industry, providing innovative solutions for climate control with their latest product line, including the CHX1-125N, CDX1-75N, CDX1-100N, CHX1-75N, and CHX1-100N models. These units are designed for both efficiency and performance, catering to a wide range of heating and cooling needs.

One of the standout features of these models is their high energy efficiency ratings. Utilizing advanced inverter technology, these units dynamically adjust their operating frequency, optimizing energy consumption while maintaining consistent temperature control. This adaptability not only enhances comfort but also significantly lowers energy bills, making them an eco-friendly choice for both residential and commercial applications.

The CHX1 series, including the CHX1-125N, CHX1-75N, and CHX1-100N, is renowned for its robust build quality and superior performance in extreme conditions. They can operate effectively in varied environments, ensuring reliable heating during harsh winters and efficient cooling amid hot summers.

In contrast, the CDX1 series—featuring the CDX1-75N and CDX1-100N—focuses on delivering exceptional versatility. These models come equipped with advanced multi-zone capabilities, allowing users to control different areas or rooms with precision. This zoning capability not only enhances comfort but also optimizes energy efficiency by allowing users to heat or cool only the spaces that are occupied.

A common characteristic among all these models is their quiet operation. Designed with noise-reduction technologies, the units are engineered to operate with minimal sound, making them ideal for residential settings, offices, and other noise-sensitive environments.

Moreover, Thermo Products emphasizes user-friendly interfaces in their design. With intuitive controls and smart connectivity options, users can easily manage their HVAC systems through mobile applications, ensuring convenience and optimal temperature management from anywhere.

Overall, Thermo Products’ CHX1-125N, CDX1-75N, CDX1-100N, CHX1-75N, and CHX1-100N models exemplify the perfect blend of innovation, efficiency, and user-centered design. These heating and cooling solutions not only meet the demands of modern living but also contribute to sustainability efforts, making them a valuable addition to any climate control system.