Mr. Heater Horizontal 4" Vent Kit Home Improvement > Plumbing > Plumbing Chemicals and Compounds > Septic Tank Treatments With its length of 17-1/4"

With its length of 17-1/4" and width of 2-3/4"

Two out of the three will also allow for easy area and volume calculation capabilities

Made with durable Natural Aluminum

Designed with exclusive Filtrete 3-in-1 technology with a unique active carbon layer that captures odor particles

and replaces smelly sponges and throwaway paper towels

Mr. Heater Horizontal 4" Vent Kit Home Improvement > Plumbing > Plumbing Chemicals and Compounds > Septic Tank Treatments With its length of 17-1/4"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 12in vent pipe, 4 in 45 degree elbow, 4 in wall thimble, 4 in termination tee, screws, and silicone. Stainless steel is