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Unique situations found in some commercial structures:

   Concrete Core Sampls
The concrete from which these 5" core samples were taken was reinforced with one-inch rebar. Concrete Core Samples

   Ventilation Fans
(Notice the flashlight and chairs for size and perspective)
Return Fan

30 hp 83,700 cfm
@ 1" tsp
Return Fan

150 hp 91,400 cfm
@ 6" tsp
Supply Fan

Supply Fan

Motor Close-up

Close-up of 150 hp Motor
   Return and Intake Air Ducts
36" Below Grade Cold Air Return Air Duct 36-inch Below Grade Cold Air Return Duct

54-inch Below Grade Fresh Air Intake

54" Below Grade Fresh air Intake Duct

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