Aquathin MEGACHAR BFF-1 Getting Started page 30

INSTALLATION DIAGRAM
Indoor connections to drain shall be designed and con-
structed to provide for connection to the sanitary system
through an air gap of 2 pipe diameters or 25mm (1 inch),
whichever is larger.
30 © 2007-2009 Aquathin Corporation. All rights reserved. Rev 20091029