The Economy Muffle Furnace Exhaust Kit not only vents fumes but also improves firing results.
It pulls fresh oxygen into the kiln for brighter colors, especially noticeable with red and orange glazes and decals. Fire red and green glazes in the same load without glaze contamination. The Exhaust Kit draws air from the furnace, dilutes it with room air, and pushes it outdoors through a vent hose.
The extra oxygen and increased air movement help burn carbon out of the clay, which helps eliminate a host of firing problems: bloating, dark patches in the clay, porcelain mildew, pinholes, pitting, blisters, and bubbles.
The Exhaust Kit removes fumes containing volatile metals, fluorides and sulphur oxides. You can fire even lusters, decals, metallics, and pate-de-verre glass without strong odor.
The flow of fresh air helps even out the temperature throughout the furnace. The vent also extends the life of the Muffle Furnace tube assembly, since fumes by-pass the tube. You will enjoy the convenience of the Economy Muffle Furnace Exhaust Kit. Throughout the firing, keep the lid closed and peephole plugs inserted. You no longer need to remember to lower the hot lid from vented position.
The Economy Muffle Furnace Exhaust Kit increases firing time by about five minutes for firings up to cone 4; 12 minutes for firings from cone 4 to 10. It has little effect on maximum temperature. At 132 watts, electrical consumption of the Exhaust Kit motor is only pennies per firing.
From the shut-off temperature down to 1000°F, the Economy Muffle Furnace Exhaust Kit has little effect on cooling time. From 1000°F to room temperature, it reduces cooling time by about two hours.
The Economy Muffle Furnace Exhaust Kit requires a separate 120 volt wall plug unless your furnace is equipped with the AOP vent.
A 3’ long 2” duct comes with each vent. The 2” duct runs between the collection cup and the blower motor. Use 4” aluminum dryer duct or 4” PVC pipe between the motor and the vent outlet. (Do not use vinyl dryer duct.)
Position the Economy Muffle Furnace Exhaust Kit next to the furnace and attach the collection cup to the bottom or side of the furnace. The collection cup fits under most top-loading kilns. Since the vent motor is away from the furnace, there is no vibration in the furnace, the motor is kept away from the heat of the furnace, and the fan is easy to clean. The Economy Muffle Furnace Exhaust Kit works with all Economy Muffle Furnaces except the smallest tabletop models.