More than one type...
Which water heater do you have? If it's the tankless Girard, you need to locate the silicone grommet around the exhaust port as you close the door. Once its located, close the door that last little bit and slide the latch to the closed position. The grommet is floating to accommodate different locations and still provide a close fit. The latch may need a squirt of Silicone lube to ensure free action.
I've lived with the Girard on two rigs over 4 years and know it fairly well!
Good luck!
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