ANSI Z21.47-2006/CSA 2.3-2006 (R2012)

1.1 Scope 1.1.1 This standard applies to automatically operating gas-fired central furnaces see Part XI, Definitions, hereinafter referred to as furnaces, for installation in residential, commercial, and industrial structures including furnaces for Direct Vent, Recreational Vehicle, Outdoor, and Manufactured (Mobile) Homes. These furnaces may include a cooling unit. All units shall be constructed entirely of new, unused parts and materials.