scope:

This standard applies to newly-produced direct gas-fired circulating heaters (see Part IV, Definitions) of 400,000 Btu (117 228 W) or less, hereinafter referred to as heaters, constructed entirely of new, unused parts and materials and primarily intended for permanent installation in agricultural animal confinement buildings. All the products of combustion generated by the heater are released into the area being heated.

These requirements apply to heaters having a gas supply pressure rating not exceeding 1/2 psi (3.45 kPa) at the gas inlet of the appliance.

This standard does not apply to heaters intended for use in green houses.

This standard applies to self-contained heaters with integral means for air circulation.

This standard does not cover heaters employing a flameless catalytic combustion process, heaters for use with liquid phase fuel gases or infrared type heaters.

This standard applies to heaters having an air outlet temperature of 350°F (176.5°C) above room temperature or less (see 2.8.2).

Special construction provisions applicable to a heater for outdoor installation are outlined under 1.2.5, 1.3.5, 1.3.6, 1.5, 1.7.3, 1.9.3-2b and 1.22.4.

Heaters covered by this standard are intended for use with natural or liquefied petroleum gases.

The construction of heaters for use with the above-mentioned gases is covered under Part I.

The performance of heaters for use with the above-mentioned gases is covered under Part II.

Special construction provisions for heaters intended for installations subject to spray washdown are outlined under 1.2.7 and 1.21.1.

Exhibit A contains a list of standards specifically referenced in this standard, and sources from which these reference standards may be obtained

If a value for measurement as given in this standard is followed by an equivalent value in other units, the first stated value is to be regarded as the specification.

All references to psi throughout this standard are to be considered gage pressure unless otherwise specified.