หน่วยล่างสลากกินแบ่งรัฐบาล สูตร1 14งวดติด 16มิถุนายน2562
Heat exchanger of Suspended installation 80% efficiency corssflow heat recovery ventilator
is made of ER paper which is featured by high moisture permeability, good air tightness, excellent tear resistance, and aging resistance.
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