I need to find technical details about Nationwide Boiler's ultra-low NOx solutions. Specifically, from the press release titled '2½ PPM NOx Achieved at Source Test for 350HP In-Stock Package Firetube Boiler', identify the model name of the Oilon ultra-low NOx burner and explain its key features for achieving ultra-low NOx without FGR or air filters.
Navigate to the 'Resource Center' from the homepage. Click on the 'Press Releases' section. Scroll down to locate and click on the press release titled '2½ PPM NOx Achieved at Source Test for 350HP In-Stock Package Firetube Boiler'. Read the article to identify the specific model name of the Oilon ultra-low NOx burner. Extract the key features or technology mentioned that enable the burner to achieve ultra-low NOx without Flue Gas Recirculation (FGR) or air filters. Synthesize the findings into a concise answer.
Successfully navigate to and open the specified press release. Accurately identify and state the Oilon burner model name. Accurately state that the burner is constructed with patent pending technology. Accurately state that it achieves single digit, ultra-low NOx with lower residual oxygen, no air filters, and no flue gas recirculation (FGR) while utilizing conventional gas delivery pressures.