Heil gas furnace help

[TennBears]

I have a HEIL combined heating and air unit model #NPGAA42E1K7 that was installed when my house was built in the late 80's. The draft induction motor needs replacing. I found the motor no problem but the motor housing behind it is rusting out and even has a small, pinky finger size hole in it. It is made of sheet metal and looks like it is easy to replace simply by removing a few screws, however I have no idea what this part is called or how to find one. I've searched for a parts breakdown for this unit but I guess due to age I'm having trouble finding one. Some help would be greatly appreciated. Thanks!

 

Here's a pic

 

[alamo1718]

I just uploaded a file named Heil / ICP, PGA, PGM,NPG Package units HVAC. It has the parts breakdown for your unit. 

 

HOWEVER, I can't find the hole in your posted picture. If there is a hole in the heat exchanger, it can leak Carbon Monoxide into your house. That is a very very dangerous, sometimes deadly situation. At a minimum, get a CO detector or check the batteries in your existing CO detector. I would also strongly recommend you call a HVAC contractor and have them check your furnace. There is already one hole and I can see rust in your picture and the system is old. These are the classic signals that a heat exchanger may very well be bad/cracked/hole/rusted through. The other danger in a cracked heat exchanger is that it can blow that flame into the duct work and into your house. 

[TennBears]

Thank you for responding so quickly. Forgive me if I've overlooked it but I cannot seem to find the file you uploaded about my unit. If you could, please point me in the direction to find it. Also I have replaced the heat exchanger a few years back. Is that something I still need to be concerned with? Thank you again for your help!

[JJDH]

Have a contractor do a tune up. That part is called a cold header collector box by most manufacturers. That unit should have a combustion test done. At this point it doesn't make sense to keep repairing a 1980s furnace. Consider updating.

[TennBears]

Thank you, now I know what it is called but I'm having trouble finding it because I can't find a part number. Any way to find a break down of this unit or a part number?