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We have a customer that is in need of a humidifier, and their below pictured air handler is installed in a closet where the return air is drawn through the louvered door to the closet The air handler sits on a base box above the water heater. The box is just tall enough for the air filter, no where near enough room to mount a humidifier. I was thinking of mounting a bypass unit directly on the side of the air handler, right above the coil. This is still return air, and then I would run the bypass duct to the top of the unit, and use a square to round to make the connection. Has anyone done this before, and do they have any thoughts on this type of install? I have installed plenary of humidifiers, but not with this type of setup. Thanks to all.