Heres an easy one for you pros. I am plumbing in my new Weil Mcclain CGa4 boiler and I have come to the Watts backflow preventer. I have found copious amounts of information online (especially right here on Terry's site!) on the rest of the system but I cannot find any info on how to plumb the vent on the side of the backflow preventer. My old oil burning boiler didn't have one and the one illustrated diagram I have found shows it vented to the floor. How much and how often can I count on this thing spewing? Do I need to keep a bucket under a vent line or plumb it to the sump pump. Any enlightenment would be greatly appreciated. Thanks, Dan