Reports the result of investigation of the impact of various operational factors on trace combustion products emission rates from unvented gas appliances including ranges and space heaters. The impact of the following factors on the indoor NO, NO2 and CO emission rates were evaluated under controlled conditions in an environmental chamber - 1) the appliance typeand/or design, 2) the primary aeration level, 3) the fuel input rate, 4) the time dependence of emission rates, and 5) the presence of absorbing surfaces such as wood, plaster board, curtains, carpets, linoleum and plaster.
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