I have a number of clients that use flash dry.
The method requires placing air producers directly after the spot-free rinse applicator.
By stripping excess water immediately from the vehicle's surface as it is being applied, a virtual drip space is created.
The result is water rolls up on itself like a wave and gathers up the remaining water producing a dryer vehicle and using a lot less space than conventional method.
Generally speaking, the distance between rinse arch and dryer nozzle is about three feet.
Looking at schematic, positioning of producers resembles a V or diamond shape.
For example, one of my clients has 40’ mini-tunnel. The dryer configuration has three rows.
First row has one 15 hp producer positioned 3’ from rinse arch, followed by a row with four 15’ hp producers, followed by a row with one 15’ hp producer.
I was sold on this method about 7 or 8 years ago when Vince MacNeil and his chief engineer flew to Kansas to show us how to set this up for mini-tunnel, one of the first of its kind.