Minimum distance between water heater tanks and AC ducts

[LuisPex]

Hi folks,

I just had to replace the AC ducts in my house, after battling mold for 3 years. The new installation has the AC ducts going in front of the water heater tanks, and actually touching one of the tanks. Is this allowed? Shouldn't there be a minimum clearance between the water heater tanks and the AC ducts? Does anyone know what the Texas residential code say about that?
Thanks!

Luis

 

[Sylvan]

a picture would be awesome to see