Limited Warranty What is covered? SFT, Inc., a subsidiary of ROHO, Inc., covers any defects in materials or workmanship of the product. Any substitutions of supplied components will void the warranty. For how long? 12 months from the date the product was originally purchased, with the exception of the cover, which has a 6-Month Limited Warranty. What is not covered? A product that has been misused, damaged by an accident, or damaged from "an act of Nature," e.g., flood, tornado, earthquake, fire.