CAZ testing. What’s a CAZ , Does my new home have one ? Why should it be tested ? All legit questions. CAZ stands for Combustion Appliance Zone. If you have a fossil fuel burning heating unit, your new home has a CAZ. Now, why should you care about it? Simple, its a Health and Safety concern. We will do testing to confirm that your heat producing boiler or furnace is properly venting the flue gases up and out of the home. A heating unit that is not venting correctly can be back drafting harmful gases back into the home. Certinspectors has been trained and certified as a CAZ testing company. During the initial information intake, we will ask where the heating unit is located. If it is on the same floor as the living area, then a CAZ test will be strongly suggested.