*We clean the ENTIRE Duct/HVAC system the right way with a TRUCK-MOUNTED negative air vacuum system - no gimmicks or extra charges! Minimum charges apply. Air duct cleaning coupon accepted for homes in the Puget Sound area in WA from Alpine Specialty Cleaning. Not valid with any other offer. Coupon void if altered. Expires Thu Aug 31 23:59:59 EDT 2017.