Hi I'm a second year apprentice who works primarilly on comercial rooftops and industrial chillers. I've recently started taking on some residential calls on the side and am curiouse on certain do and donts. I have a customer who wants to add a plenum heater to his existing heat pump/ oil furnace setup.
Thing is i am limitted for space. I have 9'' from the exit of the furnace to the bottom of the coil and only 1'' fron the top of the coil to elbow of the supply trunk.
My question is if i drop the coil right to the exit of the furnace and try to fit my plenum heater on top of the coil will there be any danger in possibly damaging the coils plastic drain base? The plenum heater i was thinking of instaling was Thermolec.

thx from the Newbee.