Access Door - The GDD is a UL and ULC listed access door for installation into grease ducts. The 16 gage steel construction along with the high temperature resistant gasket and sealant allows this door to be grease tight and airtight. This door meets or exceeds requirements of all mechanical codes. Bolt in unit easily installed into existing ductwork Duct cutout template included No bolts penetrate to the interior of the duct Two handles for easy removal and installation