ANSI Z21.11.2: What a Vent-Free Certification Covers
ANSI Z21.11.2 is the unvented room heater standard. What a listing on the label actually certifies, what it does not, and how to check your own unit.
ansi z21.11.2 vent free certification
ANSI Z21.11.2 is the unvented room heater standard. What a listing on the label actually certifies, what it does not, and how to check your own unit.