No. 839 is an electrically-heated, 850°F walk-in oven from Grieve, currently used for heat treating and high-temperature batch paint baking. Workspace dimensions measure 72"W x 120"D x 72"H. 120 kW are installed in Incoloy-sheathed tubular heating elements, while a 12,500 CFM, 10 hp recirculating blower provides a combination horizontal/vertical airflow to the workload. This Grieve walk-in oven features an aluminized steel exterior and interior with 7" thick insulated walls, plus a 4" thick insulated floor with built-in truck wheel guide tracks. Inner and outer door gaskets are provided, with the inner gasket sealing against the door plug, while the outer gasket seals directly against the front face of the oven. All safety equipment required by NFPA Standard 86 for handling flammable solvents are onboard No. 839, including explosion-venting door hardware, powered forced exhauster air flow safety switch and purge timer. Also featured on this walk-in oven are a recording and programming temperature controller with separate contactors and a recirculating blower air flow safety switch.