| 摘要 |
An infrared emitter (34) at least partially defines an interior space that at least partially contains convective prod-ucts of combustion. A burner (32) provides a mixture of combustible gas and primary air to the combustion, while secondary air is also provided to the combustion. A first side of the infrared emitter is in opposing face-to- face relation with the interior space so that the first side of the infrared emitter is exposed to, and heated by, the convective products of combustion. As a result, a second side of the infrared emitter emits infrared radiation. Static gauge pressure, measured at a location that is within the interior space and adjacent to the first side of the infrared emitter, may not exceed about 0.009 inches water column while the burner is operat-ing. Excess air present in gasses exhausted from the interior space may be less than 300% while the burner is operating. |
