“Besides the obvious (towels and a prep cart) what else do I need to have to add a hand dry to my EE.”
Most obvious is two people side-drying cars inside exit end of tunnel. 2 people fully burdened $36,000 per year, fixed cost.
You need towels and capacity to clean and spin them damp.
Average use is 2 towels/person/car or 60 cars/hour * 4 = 240 towels/hour divided by 12 = 20 dozen * $15 = $300 for towels plus laundry
soap
Dozen China soaker towel dry weigh 3 lbs. * 20 = 60 lbs an hour
Domestic 20 lbs or 60 / 20 = 3 loads an hour = domestic $1,000 cost
At churn rate of 240 towels an hour prep cart is too small for folding and stacking towels. So, you need a big flat table on each side of tunnel. Also, two hampers for dirty towels.
Inside a wind tunnel and wiping water off moving vehicles all day is noisy and monotonous work. So, you need disposable hearing protection and breaks on higher volume days.
Increase in average fixed cost per month to side dry cars as above = $3,200
$3,200 / $8 price = 400 more cars a month to pay for it