N.Y. Comp. Codes R. & Regs. tit. 10, § 71.3 – Requirements.

(a) Manufacturers of vent-free gas space heating appliances shall produce shipping carton labels for vent-free gas space heating appliances that prominently and clearly display, in bold type no smaller than 14 point, the following language:
Caution:
This appliance is a supplemental heat source and should not be the primary heat source. This appliance must be installed and serviced according to the manufacturer's instructions and local and State building codes. Select a model with appropriate heat output using sizing guidelines provided by the manufacturer. Using a heater with greater heat output than recommended may be harmful to your health. As with other fuel burning appliances, local building codes may require installation of a carbon monoxide detector in your home.
Sellers of vent-free gas space heating appliances shall ensure that this label is on the outside of each vent-free gas heating appliance shipping carton and is prominently and clearly displayed, in bold type no smaller than 14 point, on or near each vent-free gas space heating appliance on display at a point-of-sale.
(b) Within four years of the effective date of this regulation, manufacturers of vent-free gas space heating appliances shall produce shipping carton labels for vent-free gas space heating appliances that prominently and clearly display, in bold type no smaller than 14 point, information on the vent-free gas space heating appliance's measured carbon monoxide and nitrogen dioxide emission rates as a percentage of the carbon monoxide and nitrogen dioxide emission rate standards referenced in a recognized industry standard for vent-free gas space heating appliances. Sellers of vent-free gas space heating appliances shall ensure that this label is on the outside of each vent-free gas space heating appliance shipping carton and is prominently and clearly displayed, in bold type no smaller than 14 point, on or near each vent-free gas space heating appliance on display at a point-of-sale. The Commissioner of Health must have determined that the methods and procedures used to develop the carbon monoxide and nitrogen dioxide emission rates for the label represent:
1. (1) normal operating conditions for the vent-free gas space heating appliance;
2. (2) a reliable analytical method; and
3. (3) an accurate statistical measure of actual emission rates.
(c) Sizing guidelines prepared by manufacturers of vent-free gas space heating appliances shall be provided at the point-of-sale by sellers of vent-free gas space heating appliances. The sizing guidelines shall be easy to understand, concise and include sample calculations illustrating the method used to select a properly-sized vent-free gas space heating appliance.