I would not test in this laundry room or near the heater/water heater. The furnace/AC unit could pull air to the return air system and the water heater could cause stack effect with the burner so close, Also the dryer will pull air to it as well. I would also extend my tripod up to get closer to the breathing zone, Im not sure that tripod is 20 inches above the floor looking at the steps it may be just 20 inches or slightly less. I would agree that this test should be done in the livable space over the crawl., especially if this laundry room is not livable or could never be a livable space.

Review section 3.3 of the AARST Protocols for Testing.