POLLUTANT EMISSION RATES FROM UNVENTED INFRARED AND CONVECTIVE GAS-FIRED SPACE HEATERS

The pollutant emission rates of nine unvented infrared and convective gas-fired space heaters were determined. The convective heaters had ceramic radiant inserts. Short-term and long-term emission rates of CO, NO, NO/sub 2/, NO/sub x/, HCHO and submicron suspended particles were quantified by operating the heaters in a 27-m/sup 3/ well-mixed chamber and using a mass-balance model. Results showed that NO and NO/sub 2/ emissions from infrared heaters were lower than those of convective heaters. On average, the CO emissions from the infrared heaters were slightly higher for infrared heaters. No difference was found between the emissions from propane and natural gas-fired space heaters. 6 refs., 2 figs., 5 tabs.