Nitric Acid Storage Tanks

Re 10,000-gallon nitric acid storage tanks for 65% nitric acid:

Are there any nitric acid storage tanks equipped with scrubbers; if so, what scrubber design is used?

Also, what is the typical vapor concentration of 65% nitric acid at ambient tempertures during the unloading process?

Also, what is the typical cubic ft/min of vapor coming off during the unloading process?