Contractor Grade: Standard 1/8" NPT air connections and top mounting holes ensure seamless integration into existing Schneider Electric or legacy Barber Colman footprints

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

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

verify your controller compatibility if attempting to modulate speed via external devices

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

Siemens Combustion QRA2(1) UV Detector Freon Contractor Grade: Standard 1/8" NPTThe 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