Pizza oven venting

[MechGuy22]

Hello everyone. I am trouble shooting a existing pizza oven that is having problems venting. The oven has no hood, it is just directly vented through a round duct. Anyone have any good resources for this? NFPA 96 and oven manufacturers don't seem to have much to offer. Any literature or rules of thumbs would be great. Thanks!

 

[cdxx139]

Do you have a fan? Last time I did a direct vent pizza oven I provided a rheostat to the fan control. They would balance the fan to the right speed, then lock it in place. A on/off switch to turn on the fan. Thinking back, I should have had it automatically energize on temperature with a local override switch.


knowledge is power

 

[trashcanman]

You should look at chap 5 in the International Mechanical Code. You will need a Type I hood if you want to capture and exhaust most of the heat (from the top and sides). The code provides ventilation rates. Put a grease exhaust fan on the roof (upblast type).

If you just want to vent it, the vent on the oven should be vented according to the BTUH input for the oven. Route it straight up, with minimum horizontal run. Provide cleanout at elbows.
Chapter 8 of the IMC will show how to size the vent.

Be careful about putting a fan in the exhaust. NFPA prohibits fan motors in the exhaust stream. An external motor (tube axial) would work.

 

[317069]

did you contac munufucturer?

 

[MechGuy22]

Like I said, this is a existing pizza oven. We are really trouble shooting it because there is smoke backing up into the kitchen. I dont have any literature on how these pizza ovens work. Obviously I am going to suggest the oven ducting be cleaned, but I am also concerned about pressure in the space. Does anyone know how these work? I am assuming there is some type of non-powered intake on the front, and the heat rises and leaves through the top.

 

[317069]

try to find manufucturer and collect information from them, find out how does it work then troubleshoot it

 

[walkes]

You can try an alternate pizza oven manufacturer as well, just to get an idea how some should be installed.