Grieve's No. 948 walk-in oven is indirect gas-heated
No. 948 is an indirect gas-heated 650 °F (~343.3 °C) walk-in oven from Grieve, currently used for evaporating water from plastic. 500,000 BTU/HR are installed in a modulating natural gas burner that fires into an alloy radiant tube.
The oven has a top-mounted heat chamber, Type 304, 2B finish stainless steel interior and an aluminized steel exterior, with 5-inch-thick insulated walls. The insulated floor is lined with truck wheel guide tracks. A 6000 CFM, 5-HP recirculating blower provides horizontal airflow to the workload. The oven is equipped with a 1500 CFM stainless steel powered forced exhauster with motorized dampers on the intake and exhaust for accelerated cooling. For protection, safety equipment is included as required by IRI, FM and National Fire Protection Association Standard 86 for gas-heated equipment.
Controls onboard No. 948 include a digital programming temperature controller, manual reset excess temperature controller with separate contactors, 10-inch-diameter circular chart recorder and a recirculating blower safety switch.