Gilson Economy Muffle Furnaces have chamber capacities from 219-5,865in3 (3.6-96.1L). The 219in3 models have 2,300°F (1,260°C) maximum temperature; other models are 2,000°F (1,093°C). All models have chambers with minimum 2-1/2in (64mm) of refractory firebrick enclosed in heavy gauge painted steel cases.
Heating elements are mounted in the firebrick, easily accessible for maintenance. A metal-covered peephole for viewing is also featured, and a cord with plug is supplied. Models with side-hinged door have a manual door latch and are UL and Canadian UL approved.
MF-4A, MF-6A, and MF-8A drop-front door models have a counterweight to hold door closed. The inside surface of drop doors provides convenient space for loading/unloading. Power to heating elements is interrupted when the door is open.