Hi, new member here. I have been reading the forums for some time for all the useful info that is posted here, but this is my first time posting. I have a Harman SF 2500 wood/coal furnace, and I need to replace the firebricks inside as many of them are cracked. I have searched extensively on the Internet to find the specific type of firebrick used for my furnace but I have been unable to find much info. My question is can I just go to Home Depot and purchase some standard firebricks, or do I need to find a specific type for my furnace. I apologize for the newbie question, but any help would be greatly appreciated. Thanks!!