DiversiTech HT4040-4 40" x 40" x 4" The Hurricane Pad™ T-Class Concrete Equipment Pad The Hurricane T Class Pad™ is even heavier than The Hurricane Pad™ T-Class Concrete Equipment Padand is designed to meet the higher wind loads of taller equipment. The taller the piece of equipment mounted to the pad, the greater the wind load on the pad. These heavier 4 Inch pads provide sufficient weight to meet code for these taller condensing units.