I am looking for G4 HEPA Filter with following specifications:Product Description: 180mm(height) x 280mm(long) x 20mm(thick)I would like to place two separate orders so two different payments can be made:Order 1: Qty 50 (can you make sure thickness is not greater the 20mm)Order 2: Qty 20 (can you make sure thickness is not greater the 20mm)