odd size drip pans

[dabiz7]

I have a strange location for my water heater that requires a maximum size drip pan of 21 inches square or 21 inches diameter. That's all I got. Anyone know if there is something that size out there? online?

thanks

[kingsotall]

An HVAC shop can fab you one up but I would first ask the city inspector of any tolerances concerning the drip pan size you need.