this specific cover is designated for the FS4-3 and AF air flow series only

featuring a mounting profile that fits standard 9/16-inch by 1-1/8-inch cutouts

providing the necessary hardware to restore proper combustion air flow and venting performance

you know that keeping a condenser running at peak efficiency depends on precise airflow

Siemens Combustion QRA2(1) UV Detector Freon this specific cover is designatedThe Siemens Combustion QRA2(1) UV Detector is a high performance ultraviolet flame sensor designed specifically for the supervision of gas and oil flames in industrial and commercial burner systems. Engineered for intermittent operation, this normal sensitivity detector utilizes a side viewing photodiode to monitor UV radiation in the 190 to 270 nm spectral range. The QRA2(1) features a specialized metallized plastic housing that effectively prevents