With that deep a footing and a gravel base, it sounds like in a cold climate. I would use one to stop the spring warming of the shed and contents from drawing the water vapor under the slab depositing on shed's contents to rust.
Clothes taking longer to dry?
Clean the dryer screen in HOT water if using fabric softener sheets.
They leave a residue that impedes air-flow, costing you money.
Clean the ducting in the last six months? 17,000 dryer fires annually!
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