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Heating Unit for all SL Series, AX-TN Series, AX-TF Series (Set). The HU-3 is a professional heating unit from Optex that is specially designed to offer compatibility with the AX-100/200TF and the AX-70/130/200TN series. The HU-3 heating unit comes with a compact size that allows for effortless setup; it also offers affordability and provides a great solution for keeping the compatible devices regulating at normal temperatures when used in colder than normal climates.
