A certified appliance refers to a designation affixed to the appliance by means of a a label. This label is provided by the company that has "certified" the appliance in terms of function and clearance to combustible materials.
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An Uponor plumbing system features Engel-method crosslinked polyethylene (PEX) tubing. This is a flexible plastic tubing product that has been used for more than 35 years in radiant floor heating, plumbing and fire safety systems.
Lennox Commecial Rooftop Unit