Inquiry (采购产品): parts and price list i have an air xchange unit model 570 ND, serial no. 9420, i would like a parts and price list to order some parts for this unit please. could you tell me the difference between the sensible and desiccant heat wheels? also I've noticed some parts refer to a before and after (9/90) what does that mean? thank you. **** Hidden Message ***** roger kurtzweil 54484 USA Company: home use E-mail: rkurtzweil@gmail.com **** Hidden Message ***** rkurtzweil@gmail.com
