The category 3-horizontal 4 in vent kit provides class 3-single wall ducting for use with Mr. Heater Big Maxx unit heaters, ranging from 50,000, 80,000, and 125,000 BTUs. Complies with US standard (UL1738) and Canadian standard (S636). Designed for horizontal installation only. Kit includes 4 in. x 6-19 in. adjustable pipe, 4 in. x 12 in. vent pipe, 4 in. 45° elbow, 4 in. wall thimble, 4 in. termination tee, screws, and silicone. Stainless steel is required for horizontal installations per new category 3-certifications. Other parts may also be required for your specific installation needs. Please check and adhere to all state and local codes before installation.

• Category 1 horizontal 4 in. vent kit for use with Mr. Heater big maxx or heatstar by enerco brand unit heaters ranging from 50,000, 80,000, and 125,000 BTUs
• Stainless steel 4 in. sealed ducting meets new category 3-certifications
• Includes: 4 in. x 6-19 in. adjustable pipe, 4 in. x 12 in. vent pipe, 4 in. 45° elbow, 4 in. wall thimble, 4 in. termination tee, screws, and silicone
• Complies with US standard (UL1738) and Canadian standard (S636)
• Kit provides the pieces needed for an average installation - additional pieces may be needed

The Mr. Heater Overhead Low Intensity Radiant Tube Heater 180° U-Tube Adapter Kit is a comprehensive solution designed to enhance the versatility and functionality of Mr. Heaters's low-intensity radiant tube heaters. This kit includes a 180° 4 in. return component, couplers and detailed installation instructions, making it an indispensable accessory for HVAC professionals and facility managers seeking to optimize their heating systems.

• 180° 4 in. return
• 180° u-tube kit is to increase the amount of btu's in a space where a straight run is not needed or possible
• Includes couplers that are precision-machined to guarantee a secure and leak-free connection
• Comprehensive and easy-to-follow installation instructions