The No. 969 electrically-heated 200ºC (~392ºF) laboratory oven from Grieve Corp. currently is used for preheating 15-lb molds. With workspace dimensions of 12" × 10" × 10", the oven features 800 W installed in Incoloy-sheathed tubular elements for heating, while gravity convection provides the airflow to the load.
This specially modified oven features 1" insulated walls, an aluminized steel interior, stainless steel exterior with a #4 brushed finish, heavy-duty door latch, reinforced door hinge, shelf supports bolted through the oven walls to support the load at a double shelf height and an adjustable fresh air inlet damper at the oven bottom to control the amount of fresh air entering the chamber.
For added accuracy, the oven’s temperature control shaft is recessed and slotted to avoid a set-point change.