Brazed Plate Air to Air Heat Exchanger, 150 Plate. 5 out of 5 based on 1 reviews | Write a review. $839.23. Brazed plate heat exchanger for sale. Maximum quantity of plates is 150. Heat exchange capacity is 17k~51kBTU/10k~102kBTU/34k~240kBTU/68k~320kBTU for specific models.