Thanks for contacting Tundra Restaurant Supply with your question Jolene.
This Imperial IHR-RO Diamond Series 36" Standard Roast Oven doesn't appear to come with any accessories. That said, here is a spec sheet for this unit: http://www.etundra.com/ShowDocument.aspx?fileId=207358 The spec sheet details the features of the unit, and if any accessories are included this is where you'll find them.
In regards to ventilation, please see page 3 of the following owner's manual for air supply and ventilation specifics.
Answered on 4/30/2013 by Andrew Call from Boulder, CO