This Burnham Commercial Base Burner Manifold is a natural gas (NAT) burner orifice with a 1" diameter. The product, also known as BNRS ORIF, is designed to control the flow of gas into the burner. It functions by distributing the gas evenly across the burner, ensuring efficient combustion and heat distribution. This component is integral to the operation of commercial heating systems, providing reliable and consistent performance. The 1" size refers to the diameter of the orifice opening, which can be adjusted to regulate gas flow. This product is made from durable materials that can withstand high temperatures and pressures commonly encountered in commercial heating systems.