An air preheater (APH) is a heat exchange device used in boilers and furnaces to recover waste heat from flue gases and use it to preheat the incoming combustion air, thereby improving thermal efficiency, reducing fuel consumption, and lowering emissions. Andhra Pradesh, Arunachal Pradesh, Assam, Bihar, Chhattisgarh, Goa, Gujarat, Haryana, Himachal Pradesh, Jharkhand, Karnataka, Kerala, Madhya Pradesh, Maharashtra, Manipur, Meghalaya, Mizoram, Nagaland, Odisha, Punjab, Rajasthan, Sikkim, Tamil Nadu, Telangana, Tripura, Uttar Pradesh, Uttarakhand, West Bengal.
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