The US Chimney Corp warranty is subject to the following conditions:

• use of this pipe for venting gas appliances is limited to Category I appliances;
• the Liner/Chimney Flue must be cleaned and inspected on an annual basis by an experienced chimney professional, (i.e., at intervals of no more than 12 months each, commencing from the date of purchase). Yearly maintenance receipts for proof of service will be required at the time of warranty work.
• corrosive chemical chimney cleaners must not be used;
• driftwood, wood, or wood pellets containing salt, preservative treated lumber, plastic, and household trash must not be burned in the appliance.