... years!Just send us your opening sizes or floor plan or sketchs, our engineer will design for ... A: No problem, the Minimum Order Quantity is 1 set. Q: What do you want to know ... and price, we need followings:1. floor to floor height (includes the thickness of upper floor)2. opening sizes (Diameter or ... )3. the stairwall position (some photos or building floor plan drawins will be much appreciated) Q: Can ...