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

This unit operates on a 120VAC 60Hz input

Can I use this valve on a smaller 1/2-inch residential furnace

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

Ensure you have met the minimum differential pressure requirement of 0

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